Canagliflozin And Metformin Hydrochloride

1 INDICATIONS AND USAGE INVOKAMET and INVOKAMET XR are a combination of canagliflozin, a sodium-glucose co-transporter 2 (SGLT2) inhibitor, and metformin hydrochloride (HCl), a biguanide, indicated as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus ( 1 ). Canagliflozin Canagliflozin, when used as a component of INVOKAMET or INVOKAMET XR is indicated in adults with type 2 diabetes mellitus to reduce the risk of: Major adverse cardiovascular events in adults with type 2 diabetes mellitus and established cardiovascular disease ( 1 ). End-stage kidney disease, doubling of serum creatinine, cardiovascular death, and hospitalization for heart failure in adults with type 2 diabetes mellitus and diabetic nephropathy with albuminuria ( 1 ). Limitations of Use: Not recommended for use to improve glycemic control in patients with type 1 diabetes mellitus ( 1 ). INVOKAMET INVOKAMET is a combination of canagliflozin and metformin HCl immediate-release indicated as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus. INVOKAMET XR INVOKAMET XR is a combination of canagliflozin and metformin HCl extended-release indicated as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus. Canagliflozin Canagliflozin, when used as a component of INVOKAMET or INVOKAMET XR, is indicated in adults with type 2 diabetes mellitus to reduce the risk of: Major adverse cardiovascular events (cardiovascular death, nonfatal myocardial infarction and nonfatal stroke) in adults with type 2 diabetes mellitus and established cardiovascular disease (CVD). End-stage kidney disease (ESKD), doubling of serum creatinine, cardiovascular (CV) death, and hospitalization for heart failure in adults with type 2 diabetes mellitus and diabetic nephropathy with albuminuria greater than 300 mg/day. Limitations of Use INVOKAMET or INVOKAMET XR are not recommended for use to improve glycemic control in patients with type 1 diabetes mellitus [see Warnings and Precautions (5.2) ] .

2 DOSAGE AND ADMINISTRATION Assess renal function before initiating and as clinically indicated. Assess volume status and correct volume depletion before initiating ( 2.1 ). Individualize starting dose based on the patient's current regimen and renal function. See Table 1 in the full prescribing information for recommended starting dosages based on the current regimen ( 2.2 , 2.3 ). The maximum recommended total daily dosage is 300 mg of canagliflozin and 2,000 mg of metformin HCl ( 2.2 ). Initiation of INVOKAMET or INVOKAMET XR is not recommended in patients with an eGFR less than 45 mL/min/1.73 m 2 , due to the metformin HCl component ( 2.3 ). INVOKAMET: take one tablet orally twice daily with meals ( 2.2 ). INVOKAMET XR: take two tablets orally once daily with the morning meal. Swallow whole. Never crush, cut, or chew ( 2.2 ). Gradually escalate the dosage of metformin HCl in INVOKAMET or INVOKAMET XR to reduce the risk of gastrointestinal adverse reactions with metformin HCl ( 2.2 ). Dose adjustment for patients with renal impairment may be required ( 2.3 ). See full prescribing information for INVOKAMET and INVOKAMET XR dosage modifications due to drug interactions ( 2.4 ). May need to be discontinued at time of, or prior to, iodinated contrast imaging procedures ( 2.5 ). Withhold INVOKAMET or INVOKAMET XR at least 3 days, if possible, prior to surgery or procedures associated with prolonged fasting ( 2.6 ). 2.1 Prior to Initiation of INVOKAMET or INVOKAMET XR Assess renal function before initiating INVOKAMET or INVOKAMET XR and as clinically indicated [see Dosage and Administration (2.3) , Contraindications (4) , and Warnings and Precautions (5.1 , 5.4) ]. In patients with volume depletion, correct this condition before initiating INVOKAMET or INVOKAMET XR [see Warnings and Precautions (5.4) and Use in Specific Populations (8.5 , 8.6) ] . 2.2 Recommended Dosage and Administration INVOKAMET and INVOKAMET XR INVOKAMET and INVOKAMET XR contain canagliflozin and metformin HCl. For the available strengths of the canagliflozin and metformin HCl components in INVOKAMET and INVOKAMET XR, see Dosage Forms and Strengths (3) . Individualize the starting dosage of INVOKAMET or INVOKAMET XR based on the patient's current regimen as presented in Table 1 and based on renal function as presented in Table 2 [see Dosage and Administration (2.3 ] . INVOKAMET Take one tablet of INVOKAMET orally twice daily with meals. INVOKAMET XR Take two tablets of INVOKAMET XR orally once daily with the morning meal. Swallow each tablet whole and never crush, cut, or chew. Table 1 presents the recommended starting dosage of INVOKAMET and INVOKAMET XR based on the patient's current regimen. Table 1: Recommended Starting Dosage Based on the Current Regimen Current Regimen INVOKAMET Recommended Dosage INVOKAMET XR Recommended Dosage Not treated with either canagliflozin or metformin HCl Total daily dosage is canagliflozin 100 mg and metformin HCl 1,000 mg Metformin HCl For patients taking an evening dosage of metformin HCl extended-release tablets, skip the last dose before starting INVOKAMET or INVOKAMET XR the following morning. Total daily dosage is canagliflozin 100 mg and the nearest appropriate total daily dosage of metformin HCl Canagliflozin The same total daily dosage of canagliflozin and a total daily dosage of metformin HCl 1,000 mg Canagliflozin and metformin HCl The same total daily dosage of canagliflozin and the nearest appropriate total daily dosage of metformin HCl Recommended Dosage for Additional Glycemic Control in Adults and Pediatric Patients Aged 10 Years and Older INVOKAMET The dosage of canagliflozin in INVOKAMET may be increased to the maximum total daily dosage of 300 mg (150 mg orally twice daily) in patients tolerating a dosage of 100 mg (50 mg twice daily) of canagliflozin. The dosage of metformin HCl in INVOKAMET may be increased to the maximum total daily dosage of 2,000 mg (1,000 mg orally twice daily), with gradual escalation to reduce the risk of gastrointestinal adverse reactions with metformin HCl [see Adverse Reactions (6.1) ]. INVOKAMET XR The dosage of canagliflozin in INVOKAMET XR may be increased to the maximum total daily dosage of 300 mg orally once daily in patients tolerating a 100 mg once daily dosage of canagliflozin. The dosage of metformin HCl in INVOKAMET XR may be increased to the maximum total daily dosage of 2,000 mg once daily, with gradual escalation to reduce the risk of gastrointestinal adverse reactions with metformin HCl [see Adverse Reactions (6.1) ]. 2.3 Recommended Dosage in Adults and Pediatric Patients Aged 10 Years and Older with Renal Impairment Initiation of INVOKAMET or INVOKAMET XR is not recommended in adults or pediatric patients aged 10 years and older with an eGFR less than 45 mL/min/1.73 m 2 , due to the metformin component. Table 2 provides dosage recommendations for adults and pediatric patients aged 10 years and older with renal impairment, based on eGFR [see Use in Specific Populations (8.6) and Clinical Studies (14.4) ]. Table 2: Recommended Dosage in Adults and Pediatric Patients Aged 10 Years and Older with Renal Impairment Estimated Glomerular Filtration Rate [eGFR (mL/min/1.73 m 2 )] Recommended Dosage of INVOKAMET or INVOKAMET XR For the dosing frequency of INVOKAMET and INVOKAMET XR, see Dosage and Administration (2.2). eGFR 45 to less than 60 The maximum total daily dosage of canagliflozin is 100 mg. eGFR 30 to less than 45 Assess the benefit risk of continuing INVOKAMET or INVOKAMET XR. The maximum total daily dosage of canagliflozin is 100 mg. eGFR less than 30 Contraindicated. If eGFR falls below 30 during treatment; discontinue INVOKAMET or INVOKAMET XR [see Contraindications (4) ] . 2.4 Concomitant Use with UDP-Glucuronosyltransferase (UGT) Enzyme Inducers When co-administering INVOKAMET or INVOKAMET XR with an inducer of UGT (e.g., rifampin, phenytoin, phenobarbital, ritonavir), increase the total daily dosage of canagliflozin based on renal function [see Drug Interactions (7) ] : In patients with eGFR 60 mL/min/1.73 m 2 or greater, increase the total daily dosage of canagliflozin to 200 mg in patients currently tolerating a total daily dosage of canagliflozin 100 mg. The maximum total daily dosage of canagliflozin is 300 mg. In patients with eGFR less than 60 mL/min/1.73 m 2 , increase the total daily dosage of canagliflozin to a maximum of 200 mg in patients currently tolerating a total daily dosage of canagliflozin 100 mg. 2.5 Discontinuation for Iodinated Contrast Imaging Procedures Discontinue INVOKAMET or INVOKAMET XR at the time of, or prior to, an iodinated contrast imaging procedure in patients with an eGFR of less than 60 mL/min/1.73 m 2 ; in patients with a history of liver disease, alcoholism or heart failure; or in patients who will be administered intra-arterial iodinated contrast. Re-evaluate eGFR 48 hours after the imaging procedure; restart INVOKAMET or INVOKAMET XR if renal function is stable [see Warnings and Precautions (5.1) ] . 2.6 Temporary Interruption for Surgery Withhold INVOKAMET or INVOKAMET XR at least 3 days, if possible, prior to surgery or procedures associated with prolonged fasting. Resume INVOKAMET or INVOKAMET XR when the patient is clinically stable and has resumed oral intake [see Warnings and Precautions (5.2) and Clinical Pharmacology (12.2) ].

6 ADVERSE REACTIONS The following important adverse reactions are also discussed elsewhere in the labeling: Lactic Acidosis [see Boxed Warning and Warnings and Precautions (5.1 , 5.4) ] Diabetic Ketoacidosis in Patients with Type 1 Diabetes and Other Ketoacidosis [see Warnings and Precautions (5.2) ] Lower Limb Amputation [see Warnings and Precautions (5.3) ] Volume Depletion [see Warnings and Precautions (5.4) ] Urosepsis and Pyelonephritis [see Warnings and Precautions (5.5) ] Hypoglycemia with Concomitant Use with Insulin or Insulin Secretagogues [see Warnings and Precautions (5.6) ] Necrotizing Fasciitis of the Perineum (Fournier's gangrene) [see Warnings and Precautions (5.7) ] Genital Mycotic Infections [see Warnings and Precautions (5.8) ] Hypersensitivity Reactions [see Warnings and Precautions (5.9) ] Bone Fracture [see Warnings and Precautions (5.10) ] Vitamin B 12 Deficiency [see Warnings and Precautions (5.11) ] Most common adverse reactions associated with canagliflozin (5% or greater incidence): female genital mycotic infections, urinary tract infection, and increased urination ( 6.1 ). Most common adverse reactions associated with metformin HCl (5% or greater incidence) are diarrhea, nausea, vomiting, flatulence, asthenia, indigestion, abdominal discomfort, and headache ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Janssen Pharmaceuticals, Inc. at 1-800-526-7736 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Studies Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to the rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. Canagliflozin has been evaluated in clinical trials in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus. Additionally, canagliflozin has been studied in clinical trials in adult patients with type 2 diabetes mellitus who also have heart failure or chronic kidney disease. The overall safety profile of canagliflozin was consistent across the studied indications. Clinical Trials in Adults with Type 2 Diabetes Mellitus Pool of Placebo-Controlled Trials for Glycemic Control Canagliflozin The data in Table 3 are derived from four 26-week placebo-controlled trials where canagliflozin was used as monotherapy in one trial and as add-on therapy in three trials. These data reflect exposure of 1,667 adult patients to canagliflozin and a mean duration of exposure to canagliflozin of 24 weeks with 1,275 patients exposed to a combination of canagliflozin and metformin HCl. Patients received canagliflozin 100 mg (N=833), canagliflozin 300 mg (N=834) or placebo (N=646) once daily. The mean daily dose of metformin HCl was 2,138 mg (SD 337.3) for the 1,275 patients in the three placebo-controlled metformin HCl add-on trials. The mean age of the population was 56 years and 2% were older than 75 years of age. Fifty percent (50%) of the population was male and 72% were White, 12% were Asian, and 5% were Black or African American. At baseline the population had diabetes for an average of 7.3 years, had a mean HbA 1C of 8.0% and 20% had established microvascular complications of diabetes. Baseline renal function was normal or mildly impaired (mean eGFR 88 mL/min/1.73 m 2 ). Table 3 shows common adverse reactions associated with the use of canagliflozin. These adverse reactions were not present at baseline, occurred more commonly on canagliflozin than on placebo, and occurred in at least 2% of patients treated with either canagliflozin 100 mg or canagliflozin 300 mg. Table 3: Adverse Reactions from Pool of Four 26−Week Placebo-Controlled Trials Reported in ≥ 2% of Canagliflozin-Treated Adult Patients The four placebo-controlled trials included one monotherapy trial and three add-on combination trials with metformin HCl, metformin HCl and sulfonylurea, or metformin HCl and pioglitazone. Adverse Reaction Placebo N=646 Canagliflozin 100 mg N=833 Canagliflozin 300 mg N=834 Note: Percentages were weighted by trials. Trial weights were proportional to the harmonic mean of the three treatment sample sizes. Urinary tract infections Urinary tract infections include the following adverse reactions: Urinary tract infection, Cystitis, Kidney infection, and Urosepsis. 3.8% 5.9% 4.4% Increased urination Increased urination includes the following adverse reactions: Polyuria, Pollakiuria, Urine output increased, Micturition urgency, and Nocturia. 0.7% 5.1% 4.6% Thirst Thirst includes the following adverse reactions: Thirst, Dry mouth, and Polydipsia. 0.1% 2.8% 2.4% Constipation 0.9% 1.8% 2.4% Nausea 1.6% 2.1% 2.3% N=312 N=425 N=430 Female genital mycotic infections Female genital mycotic infections include the following adverse reactions: Vulvovaginal candidiasis, Vulvovaginal mycotic infection, Vulvovaginitis, Vaginal infection, Vulvitis, and Genital infection fungal. 2.8% 10.6% 11.6% Vulvovaginal pruritus 0.0% 1.6% 3.2% N=334 N=408 N=404 Male genital mycotic infections Male genital mycotic infections include the following adverse reactions: Balanitis or Balanoposthitis, Balanitis candida, and Genital infection fungal. 0.7% 4.2% 3.8% Abdominal pain was also more commonly reported in patients taking canagliflozin 100 mg (1.8%), 300 mg (1.7%) than in patients taking placebo (0.8%). Canagliflozin and Metformin HCl The incidence and type of adverse reactions in the three 26-week placebo-controlled metformin HCl tablets add-on trials in adults, representing a majority of data from the four 26-week placebo-controlled trials, was similar to the adverse reactions described in Table 3. There were no additional adverse reactions identified in the pooling of these three placebo-controlled trials that included metformin HCl tablets relative to the four placebo-controlled trials. In a trial in adults with canagliflozin as initial combination therapy with metformin HCl [see Clinical Studies (14.1) ] , an increased incidence of diarrhea was observed in the canagliflozin and metformin HCl combination groups (4.2%) compared to canagliflozin or metformin HCl monotherapy groups (1.7%). Placebo-Controlled Trial in Diabetic Nephropathy The occurrence of adverse reactions for canagliflozin was evaluated in patients participating in CREDENCE, a trial in adult patients with type 2 diabetes mellitus and diabetic nephropathy with albuminuria ˃ 300 mg/day [see Clinical Studies (14.4) ] . These data reflect exposure of 2,201 adult patients to canagliflozin and a mean duration of exposure to canagliflozin of 137 weeks. The rate of lower limb amputations associated with the use of canagliflozin 100 mg relative to placebo was 12.3 vs 11.2 events per 1,000 patient-years, respectively, with 2.6 years mean duration of follow-up. The incidence of hypotension was 2.8% and 1.5% on canagliflozin 100 mg and placebo, respectively. Pool of Placebo- and Active-Controlled Trials for Glycemic Control and Cardiovascular Outcomes The occurrence of adverse reactions for canagliflozin was evaluated in adult patients participating in placebo- and active-controlled trials and in an integrated analysis of two cardiovascular trials, CANVAS and CANVAS-R. The types and frequency of common adverse reactions observed in the pool of eight clinical trials (which reflect an exposure of 6,177 adult patients to canagliflozin) were consistent with those listed in Table 3. Percentages were weighted by trials. Trial weights were proportional to the harmonic mean of the three treatment sample sizes. In this pool, canagliflozin was also associated with the adverse reactions of fatigue (1.8%, 2.2%, and 2.0% with comparator, canagliflozin 100 mg, and canagliflozin 300 mg, respectively) and loss of strength or energy (i.e., asthenia) (0.6%, 0.7%, and 1.1% with comparator, canagliflozin 100 mg, and canagliflozin 300 mg, respectively). In the pool of eight clinical trials, the incidence rate of pancreatitis (acute or chronic) was 0.1%, 0.2%, and 0.1% receiving comparator, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. In the pool of eight clinical trials, hypersensitivity-related adverse reactions (including erythema, rash, pruritus, urticaria, and angioedema) was 3.0%, 3.8%, and 4.2% of adult patients receiving comparator, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. Five patients experienced serious adverse reactions of hypersensitivity with canagliflozin, which included 4 patients with urticaria and 1 patient with a diffuse rash and urticaria occurring within hours of exposure to canagliflozin. Among these patients, 2 patients discontinued canagliflozin. One patient with urticaria had recurrence when canagliflozin was re-initiated. Photosensitivity-related adverse reactions (including photosensitivity reaction, polymorphic light eruption, and sunburn) occurred in 0.1%, 0.2%, and 0.2% of patients receiving comparator, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. Other adverse reactions occurring more frequently on canagliflozin than on comparator were: Lower Limb Amputation An increased risk of lower limb amputations associated with canagliflozin was observed in CANVAS (5.9 vs 2.8 events per 1,000 patient-years) and CANVAS-R (7.5 vs 4.2 events per 1,000 patient-years), two randomized, placebo-controlled trials evaluating adult patients with type 2 diabetes who had either established cardiovascular disease or were at risk for cardiovascular disease. Patients in CANVAS and CANVAS-R were followed for an average of 5.7 and 2.1 years, respectively [see Clinical Studies (14.3) ] . The amputation data for CANVAS and CANVAS-R are shown in Tables 4 and 5, respectively . Table 4: Amputations in the CANVAS Trial in Adults with Type 2 Diabetes Mellitus and Atherosclerotic Cardiovascular Disease Placebo N=1,441 Canagliflozin 100 mg N=1,445 Canagliflozin 300 mg N=1,441 Canagliflozin (Pooled) N=2,886 Note: Incidence is based on the number of patients with at least one amputation, and not the total number of amputation events. A patient's follow-up is calculated from Day 1 to the first amputation event date. Some patients had more than one amputation. Patients with an amputation, n (%) 22 (1.5) 50 (3.5) 45 (3.1) 95 (3.3) Total amputations 33 83 79 162 Amputation incidence rate (per 1,000 patient-years) 2.8 6.2 5.5 5.9 Hazard Ratio (95% CI) -- 2.24 (1.36, 3.69) 2.01 (1.20, 3.34) 2.12 (1.34, 3.38) Table 5: Amputations in the CANVAS-R Trial in Adults with Type 2 Diabetes Mellitus and Atherosclerotic Cardiovascular Disease Placebo N=2,903 Canagliflozin 100 mg (with up-titration to 300 mg) N=2,904 Note: Incidence is based on the number of patients with at least one amputation, and not the total number of amputation events. A patient's follow-up is calculated from Day 1 to the first amputation event date. Some patients had more than one amputation. Patients with an amputation, n (%) 25 (0.9) 45 (1.5) Total amputations 36 59 Amputation incidence rate (per 1,000 patient-years) 4.2 7.5 Hazard Ratio (95% CI) -- 1.80 (1.10, 2.93) Renal Cell Carcinoma In the CANVAS trial in adults (mean duration of follow-up of 5.7 years) [see Clinical Studies (14.3) ] , the incidence of renal cell carcinoma was 0.15% (2/1,331) and 0.29% (8/2,716) for placebo and canagliflozin, respectively, excluding patients with less than 6 months of follow-up, less than 90 days of treatment, or a history of renal cell carcinoma. A causal relationship to canagliflozin could not be established due to the limited number of cases. Volume Depletion-Related Adverse Reactions Canagliflozin results in an osmotic diuresis, which may lead to reductions in intravascular volume. In clinical trials for glycemic control, treatment with canagliflozin was associated with a dose-dependent increase in the incidence of volume depletion-related adverse reactions (e.g., hypotension, postural dizziness, orthostatic hypotension, syncope, and dehydration). An increased incidence was observed in adult patients on the 300 mg dose. The three factors associated with the largest increase in volume depletion-related adverse reactions in these trials were the use of loop diuretics, moderate renal impairment (eGFR 30 to less than 60 mL/min/1.73 m 2 ), and age 75 years and older (Table 6) [see Use in Specific Populations (8.5 and 8.6) ] . Table 6: Adult Patients with at Least One Volume Depletion-Related Adverse Reaction (Pooled Results from 8 Clinical Trials for Glycemic Control) Baseline Characteristic Comparator Group Includes placebo and active-comparator groups % Canagliflozin 100 mg % Canagliflozin 300 mg % Overall population 1.5% 2.3% 3.4% 75 years of age and older Patients could have more than 1 of the listed risk factors 2.6% 4.9% 8.7% eGFR less than 60 mL/min/1.73 m 2 2.5% 4.7% 8.1% Use of loop diuretic 4.7% 3.2% 8.8% Falls In a pool of nine clinical trials in adults with mean duration of exposure to canagliflozin of 85 weeks, the proportion of patients who experienced falls was 1.3%, 1.5%, and 2.1% with comparator, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. The higher risk of falls for patients treated with canagliflozin was observed within the first few weeks of treatment. Genital Mycotic Infections In the pool of four placebo-controlled clinical trials in adults for glycemic control, female genital mycotic infections (e.g., vulvovaginal mycotic infection, vulvovaginal candidiasis, and vulvovaginitis) occurred in 2.8%, 10.6%, and 11.6% of females treated with placebo, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. Patients with a history of genital mycotic infections were more likely to develop genital mycotic infections on canagliflozin. Female patients who developed genital mycotic infections on canagliflozin were more likely to experience recurrence and require treatment with oral or topical antifungal agents and anti-microbial agents. In females, discontinuation due to genital mycotic infections occurred in 0% and 0.7% of patients treated with placebo and canagliflozin, respectively. In the pool of four placebo-controlled clinical trials in adults, male genital mycotic infections (e.g., candidal balanitis, balanoposthitis) occurred in 0.7%, 4.2%, and 3.8% of males treated with placebo, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. Male genital mycotic infections occurred more commonly in uncircumcised males and in males with a prior history of balanitis or balanoposthitis. Male patients who developed genital mycotic infections on canagliflozin were more likely to experience recurrent infections (22% on canagliflozin versus none on placebo) and require treatment with oral or topical antifungal agents and anti-microbial agents than patients on comparators. In males, discontinuations due to genital mycotic infections occurred in 0% and 0.5% of patients treated with placebo and canagliflozin, respectively. In the pooled analysis of 8 randomized trials in adults evaluating glycemic control, phimosis was reported in 0.3% of uncircumcised male patients treated with canagliflozin and 0.2% required circumcision to treat the phimosis. Hypoglycemia In canagliflozin glycemic control trials, hypoglycemia was defined as any event regardless of symptoms, where biochemical hypoglycemia was documented (any glucose value below or equal to 70 mg/dL). Severe hypoglycemia was defined as an event consistent with hypoglycemia where the patient required the assistance of another person to recover, lost consciousness, or experienced a seizure (regardless of whether biochemical documentation of a low glucose value was obtained). In individual clinical trials of glycemic control in adults [see Clinical Studies (14.1) ] , episodes of hypoglycemia occurred at a higher rate when canagliflozin was co-administered with insulin or sulfonylureas (Table 7). Table 7: Incidence of Hypoglycemia Number of patients experiencing at least one event of hypoglycemia based on either biochemically documented episodes or severe hypoglycemic events in the intent-to-treat population in Randomized Clinical Trials of Glycemic Control in Adults Monotherapy (26 weeks) Placebo (N=192) Canagliflozin 100 mg (N=195) Canagliflozin 300 mg (N=197) Overall [N (%)] 5 (2.6) 7 (3.6) 6 (3.0) In Combination with Metformin HCl (26 weeks) Placebo + Metformin HCl (N=183) Canagliflozin 100 mg + Metformin HCl (N=368) Canagliflozin 300 mg + Metformin HCl (N=367) Overall [N (%)] 3 (1.6) 16 (4.3) 17 (4.6) Severe [N (%)] Severe episodes of hypoglycemia were defined as those where the patient required the assistance of another person to recover, lost consciousness, or experienced a seizure (regardless of whether biochemical documentation of a low glucose value was obtained) 0 (0) 1 (0.3) 1 (0.3) In Combination with Metformin HCl (18 weeks) Phase 2 clinical trial with twice daily dosing (50 mg or 150 mg twice daily in combination with metformin HCl) Placebo (N=93) Canagliflozin 100 mg (N=93) Canagliflozin 300 mg (N=93) Overall [N (%)] 3 (3.2) 4 (4.3) 3 (3.2) In Combination with Metformin HCl + Sulfonylurea (26 weeks) Placebo + Metformin HCl + Sulfonylurea (N=156) Canagliflozin 100 mg + Metformin HCl + Sulfonylurea (N=157) Canagliflozin 300 mg + Metformin HCl + Sulfonylurea (N=156) Overall [N (%)] 24 (15.4) 43 (27.4) 47 (30.1) Severe [N (%)] 1 (0.6) 1 (0.6) 0 In Combination with Metformin HCl + Pioglitazone (26 weeks) Placebo + Metformin HCl + Pioglitazone (N=115) Canagliflozin 100 mg + Metformin HCl + Pioglitazone (N=113) Canagliflozin 300 mg + Metformin HCl + Pioglitazone (N=114) Overall [N (%)] 3 (2.6) 3 (2.7) 6 (5.3) In Combination with Insulin (18 weeks) Placebo (N=565) Canagliflozin 100 mg (N=566) Canagliflozin 300 mg (N=587) Overall [N (%)] 208 (36.8) 279 (49.3) 285 (48.6) Severe [N (%)] 14 (2.5) 10 (1.8) 16 (2.7) In Combination with Insulin and Metformin HCl (18 weeks) Subgroup of patients (N=287) from insulin subtrial on canagliflozin in combination with metformin HCl and insulin (with or without other antiglycemic agents) Placebo (N=145) Canagliflozin 100 mg (N=139) Canagliflozin 300 mg (N=148) Overall [N (%)] 66 (45.5) 58 (41.7) 70 (47.3) Severe [N (%)] 4 (2.8) 1 (0.7) 3 (2.0) Bone Fracture In the CANVAS trial in adults [see Clinical Studies (14.3) ] , the incidence rates of all adjudicated bone fracture were 1.09, 1.59, and 1.79 events per 100 patient-years of follow-up to placebo, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. The fracture imbalance was observed within the first 26 weeks of therapy and remained through the end of the trial. Fractures were more likely to be low trauma (e.g., fall from no more than standing height), and affect the distal portion of upper and lower extremities. Metformin HCl The most common adverse reactions (5% or greater incidence) due to initiation of metformin HCl in adults are diarrhea, nausea, vomiting, flatulence, asthenia, indigestion, abdominal discomfort, and headache. In metformin clinical trials of 29-week duration, a decrease to subnormal levels of previously normal serum vitamin B 12 levels was observed in approximately 7% of adult patients. Laboratory and Imaging Tests Increases in Serum Creatinine and Decreases in eGFR Initiation of canagliflozin causes an increase in serum creatinine and decrease in estimated GFR. In patients with moderate renal impairment, the increase in serum creatinine generally does not exceed 0.2 mg/dL, occurs within the first 6 weeks of starting therapy, and then stabilizes. Increases that do not fit this pattern should prompt further evaluation to exclude the possibility of acute kidney injury [see Clinical Pharmacology (12.1) ] . The acute effect on eGFR reverses after treatment discontinuation suggesting acute hemodynamic changes may play a role in the renal function changes observed with canagliflozin. Increases in Serum Potassium In a pooled population of adult patients (N=723) in glycemic control trials with moderate renal impairment (eGFR 45 to less than 60 mL/min/1.73 m 2 ), increases in serum potassium to greater than 5.4 mEq/L and 15% above occurred in 5.3%, 5.0%, and 8.8% of patients treated with placebo, canagliflozin 100 mg, and canagliflozin 300 mg, respectively. Severe elevations (greater than or equal to 6.5 mEq/L) occurred in 0.4% of patients treated with placebo, no patients treated with canagliflozin 100 mg, and 1.3% of patients treated with canagliflozin 300 mg. In these patients, increases in potassium were more commonly seen in those with elevated potassium at baseline. Among patients with moderate renal impairment, approximately 84% were taking medications that interfere with potassium excretion, such as potassium-sparing diuretics, angiotensin-converting-enzyme inhibitors, and angiotensin-receptor blockers [see Use in Specific Populations (8.6) ]. In CREDENCE, no difference in serum potassium, no increase in adverse events of hyperkalemia, and no increase in absolute (> 6.5 mEq/L) or relative (> upper limit of normal and > 15% increase from baseline) increases in serum potassium were observed in adult patients treated with canagliflozin 100 mg relative to placebo. Increases in Low-Density Lipoprotein Cholesterol (LDL-C) and non-High-Density Lipoprotein Cholesterol (non-HDL-C) In the pool of four glycemic control placebo-controlled trials in adults, dose-related increases in LDL-C with canagliflozin were observed. Mean changes (percent changes) from baseline in LDL-C relative to placebo were 4.4 mg/dL (4.5%) and 8.2 mg/dL (8.0%) with canagliflozin 100 mg and canagliflozin 300 mg, respectively. The mean baseline LDL-C levels were 104 to 110 mg/dL across treatment groups. Dose-related increases in non-HDL-C with canagliflozin were observed in adults. Mean changes (percent changes) from baseline in non-HDL-C relative to placebo were 2.1 mg/dL (1.5%) and 5.1 mg/dL (3.6%) with canagliflozin 100 mg and 300 mg, respectively. The mean baseline non-HDL-C levels were 140 to 147 mg/dL across treatment groups. Increases in Hemoglobin In the pool of four placebo-controlled trials in adults of glycemic control, mean changes (percent changes) from baseline in hemoglobin were -0.18 g/dL (-1.1%) with placebo, 0.47 g/dL (3.5%) with canagliflozin 100 mg, and 0.51 g/dL (3.8%) with canagliflozin 300 mg. The mean baseline hemoglobin value was approximately 14.1 g/dL across treatment groups. At the end of treatment, 0.8%, 4.0%, and 2.7% of patients treated with placebo, canagliflozin 100 mg, and canagliflozin 300 mg, respectively, had hemoglobin above the upper limit of normal. Decreases in Bone Mineral Density Bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry in a clinical trial of 714 older adults (mean age 64 years) [see Clinical Studies (14.1) ] . At 2 years, adult patients randomized to canagliflozin 100 mg and canagliflozin 300 mg had placebo-corrected declines in BMD at the total hip of 0.9% and 1.2%, respectively, and at the lumbar spine of 0.3% and 0.7%, respectively. Additionally, placebo-adjusted BMD declines were 0.1% at the femoral neck for both canagliflozin doses and 0.4% at the distal forearm for patients randomized to canagliflozin 300 mg. The placebo-adjusted change at the distal forearm for patients randomized to canagliflozin 100 mg was 0%. Clinical Trials in Pediatric Patients Aged 10 Years and Older with Type 2 Diabetes Mellitus Canagliflozin Canagliflozin was administered to 84 pediatric patients in a double-blind, placebo-controlled trial of 171 pediatric patients aged 10 to 17 years with a mean exposure to canagliflozin of 48.3 weeks [see Clinical Studies (14.2) ] . At baseline, background therapies included metformin monotherapy (46%), metformin and insulin (29%), diet and exercise only (14%), and insulin monotherapy (11%). Approximately 42% were Asian, 42% were White, 11% were Black or African American, 5% were American Indian/Alaska Native, and 36% identified as Hispanic or Latino ethnicity. The mean baseline eGFR was 157.3 mL/min/1.73 m 2 , and approximately 16% (24/151) of the trial population with measurements had microalbuminuria or macroalbuminuria. The safety profile of pediatric patients treated with canagliflozin was similar to that observed in adults with type 2 diabetes mellitus. Metformin HCl In clinical trials with metformin HCl immediate-release tablets in pediatric patients with type 2 diabetes mellitus, the profile of adverse reactions was similar to that observed in adults. 6.2 Postmarketing Experience Additional adverse reactions have been identified during post-approval use of canagliflozin and/or metformin. Because these reactions are reported voluntarily from a population of uncertain size, it is generally not possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Canagliflozin Metabolism and Nutrition Ketoacidosis Renal and Urinary Acute Kidney Injury Immune System Anaphylaxis Skin and Subcutaneous Tissue Angioedema Infections Urosepsis and Pyelonephritis, Necrotizing Fasciitis of the Perineum (Fournier's gangrene) Metformin HCl Hepatobiliary Cholestatic, hepatocellular, and mixed hepatocellular liver injury

12.3 Pharmacokinetics INVOKAMET Administration of INVOKAMET 150 mg/1,000 mg fixed-dose combination with food resulted in no change in overall exposure of canagliflozin. There was no change in metformin AUC; however, the mean peak plasma concentration of metformin was decreased by 16% when administered with food. A delayed time to peak plasma concentration was observed for both components (a delay of 2 hours for canagliflozin and 1 hour for metformin) under fed conditions. These changes are not likely to be clinically meaningful. INVOKAMET XR After administration of INVOKAMET XR tablets with a high-fat breakfast, the peak (C max ) and total (AUC) exposure of canagliflozin were not altered relative to dosing in the fasted state. However, the AUC of metformin increased by approximately 61% and C max increased by approximately 13%. Canagliflozin The pharmacokinetics of canagliflozin is essentially similar in healthy subjects and patients with type 2 diabetes. Following single-dose oral administration of 100 mg and 300 mg of canagliflozin, peak plasma concentrations (median T max ) of canagliflozin occurs within 1 to 2 hours post-dose. Plasma C max and AUC of canagliflozin increased in a dose-proportional manner from 50 mg to 300 mg. The apparent terminal half-life (t 1/2 ) was 10.6 hours and 13.1 hours for the 100 mg and 300 mg doses, respectively. Steady-state was reached after 4 to 5 days of once-daily dosing with canagliflozin 100 mg to 300 mg. Canagliflozin does not exhibit time-dependent pharmacokinetics and accumulated in plasma up to 36% following multiple doses of 100 mg and 300 mg. The mean systemic exposure (AUC) at steady state was similar following once daily and twice daily dosing regimens at the same total daily dose of 100 mg or 300 mg. Absorption Canagliflozin The mean absolute oral bioavailability of canagliflozin is approximately 65%. Metformin HCl The absolute bioavailability of a metformin HCl 500 mg tablet given under fasting conditions is approximately 50% to 60%. Trials using single oral doses of metformin HCl 500 to 1,500 mg, and 850 to 2,550 mg, indicate that there is a lack of dose proportionality with increasing doses, which is due to decreased absorption rather than an alteration in elimination. Following a single oral dose of 1,000 mg metformin HCl extended-release tablets (two 500 mg tablets) after a meal, the time to reach maximum plasma metformin concentration (T max ) is achieved at approximately 7–8 hours. In both single and multiple-dose trials in healthy subjects, once daily 1,000 mg (two 500 mg tablets) dosing results in up to 35% higher C max , of metformin relative to the immediate-release given as 500 mg twice daily without any change in overall systemic exposure, as measured by AUC. Distribution Canagliflozin The mean steady-state volume of distribution of canagliflozin following a single intravenous infusion in healthy subjects was 83.5 L, suggesting extensive tissue distribution. Canagliflozin is extensively bound to proteins in plasma (99%), mainly to albumin. Protein binding is independent of canagliflozin plasma concentrations. Plasma protein binding is not meaningfully altered in patients with renal or hepatic impairment. Metformin HCl The apparent volume of distribution (V/F) of metformin following single oral doses of metformin HCl 850 mg immediate-release tablets averaged 654 ± 358 L. Metformin is negligibly bound to plasma proteins, in contrast to sulfonylureas, which are more than 90% protein bound. Metformin partitions into erythrocytes, most likely as a function of time. Metabolism Canagliflozin O -glucuronidation is the major metabolic elimination pathway for canagliflozin, which is mainly glucuronidated by UGT1A9 and UGT2B4 to two inactive O -glucuronide metabolites. CYP3A4-mediated (oxidative) metabolism of canagliflozin is minimal (approximately 7%) in humans. Metformin HCl Intravenous single-dose trials in normal subjects demonstrate that metformin is excreted unchanged in the urine and does not undergo hepatic metabolism (no metabolites have been identified in humans) or biliary excretion. Excretion Canagliflozin Following administration of a single oral [ 14 C] canagliflozin dose to healthy subjects, 41.5%, 7.0%, and 3.2% of the administered radioactive dose was recovered in feces as canagliflozin, a hydroxylated metabolite, and an O -glucuronide metabolite, respectively. Enterohepatic circulation of canagliflozin was negligible. Approximately 33% of the administered radioactive dose was excreted in urine, mainly as O -glucuronide metabolites (30.5%). Less than 1% of the dose was excreted as unchanged canagliflozin in urine. Renal clearance of canagliflozin 100 mg and 300 mg doses ranged from 1.30 to 1.55 mL/min. Mean systemic clearance of canagliflozin was approximately 192 mL/min in healthy subjects following intravenous administration. Metformin HCl Renal clearance is approximately 3.5 times greater than creatinine clearance, which indicates that tubular secretion is the major route of metformin elimination. Following oral administration, approximately 90% of the absorbed drug is eliminated via the renal route within the first 24 hours, with a plasma elimination half-life of approximately 6.2 hours. In blood, the elimination half-life is approximately 17.6 hours, suggesting that the erythrocyte mass may be a compartment of distribution. Specific Populations Trials characterizing the pharmacokinetics of canagliflozin and metformin after administration of INVOKAMET or INVOKAMET XR were not conducted in patients with renal and hepatic impairment. Descriptions of the individual components in this patient population are described below. Pediatric Patients Canagliflozin The pharmacokinetics and pharmacodynamics of canagliflozin were investigated in pediatric patients aged 10 years and older with type 2 diabetes mellitus. Oral administration of canagliflozin at 100 mg and 300 mg resulted in exposures and responses consistent with those found in adult patients. Metformin HCl After administration of a single oral metformin 500 mg immediate-release tablet with food, geometric mean metformin C max and AUC differed less than 5% between pediatric type 2 diabetic patients (12–16 years of age) and gender-and weight-matched healthy adults (20–45 years of age), all with normal renal function. Patients with Renal Impairment Canagliflozin A single-dose, open-label trial evaluated the pharmacokinetics of canagliflozin 200 mg in adult subjects with varying degrees of renal impairment (classified using the MDRD-eGFR formula) compared to healthy subjects. Renal impairment did not affect the C max of canagliflozin. Compared to healthy adult subjects (N=3; eGFR greater than or equal to 90 mL/min/1.73 m 2 ), plasma AUC of canagliflozin was increased by approximately 15%, 29%, and 53% in subjects with mild (N=10), moderate (N=9), and severe (N=10) renal impairment, respectively, (eGFR 60 to less than 90, 30 to less than 60, and 15 to less than 30 mL/min/1.73 m 2 , respectively), but was similar for ESKD (N=8) subjects and healthy subjects. Increases in canagliflozin AUC of this magnitude are not considered clinically relevant. The glucose lowering pharmacodynamic response to canagliflozin declines with increasing severity of renal impairment [see Contraindications (4) and Warnings and Precautions (5.4) ]. Canagliflozin was negligibly removed by hemodialysis. Metformin HCl In patients with decreased renal function, the plasma and blood half-life of metformin is prolonged and the renal clearance is decreased [see Contraindications (4) and Warnings and Precautions (5.1) ] . Following a single dose administration of metformin HCl extended-release tablets 500 mg in patients with mild and moderate renal failure (based on measured creatinine clearance), the oral and renal clearance of metformin were decreased by 33% and 50% and 16% and 53%, respectively [see Warnings and Precautions (5.4) ] . Metformin peak and systemic exposure was 27% and 61% greater, respectively in mild renal impaired and 74% and 2.36-fold greater in moderate renal impaired patients as compared to healthy subjects [see Contraindications (4) and Warnings and Precautions (5.1) ] . Patients with Hepatic Impairment Canagliflozin Relative to adult subjects with normal hepatic function, the geometric mean ratios for C max and AUC ∞ of canagliflozin were 107% and 110%, respectively, in subjects with Child-Pugh class A (mild hepatic impairment) and 96% and 111%, respectively, in subjects with Child-Pugh class B (moderate hepatic impairment) following administration of a single 300 mg dose of canagliflozin. These differences are not considered to be clinically meaningful. There is no clinical experience in adult patients with Child-Pugh class C (severe) hepatic impairment [see Warnings and Precautions (5.1) ] . Metformin HCl No pharmacokinetic trials of metformin HCl tablets have been conducted in patients with hepatic insufficiency [see Warnings and Precautions (5.1) ] . Pharmacokinetic Effects of Age, Body Mass Index (BMI)/Weight, Gender and Race Canagliflozin Based on the population PK analysis with data collected from 1,526 adult subjects, age, body mass index (BMI)/weight, gender, and race do not have a clinically meaningful effect on the pharmacokinetics of canagliflozin [see Use in Specific Populations (8.5) ] . Metformin HCl Metformin pharmacokinetic parameters did not differ significantly between normal subjects and patients with type 2 diabetes when analyzed according to gender. No trials of metformin pharmacokinetic parameters according to race have been performed. Canagliflozin Age had no clinically meaningful effect on the pharmacokinetics of canagliflozin based on a population pharmacokinetic analysis [see Adverse Reactions (6.1) and Use in Specific Populations (8.5) ] . Metformin HCl Limited data from controlled pharmacokinetic trials of metformin HCl tablets in healthy elderly subjects suggest that total plasma clearance of metformin is decreased, the half-life is prolonged, and C max is increased, compared with healthy young subjects. From these data, it appears that the change in metformin pharmacokinetics with aging is primarily accounted for by a change in renal function [see Warnings and Precautions (5.1 , 5.4) and Use in Specific Populations (8.5) ] . Drug Interaction Studies INVOKAMET and INVOKAMET XR Pharmacokinetic drug interaction trials with INVOKAMET or INVOKAMET XR have not been performed; however, such trials have been conducted with the individual components canagliflozin and metformin HCl. Co-administration of multiple doses of canagliflozin (300 mg) and metformin HCl (2,000 mg) given once daily did not meaningfully alter the pharmacokinetics of either canagliflozin or metformin in healthy subjects. Canagliflozin In Vitro Assessment of Drug Interactions Canagliflozin did not induce CYP450 enzyme expression (3A4, 2C9, 2C19, 2B6, and 1A2) in cultured human hepatocytes. Canagliflozin did not inhibit the CYP450 isoenzymes (1A2, 2A6, 2C19, 2D6, or 2E1) and weakly inhibited CYP2B6, CYP2C8, CYP2C9, and CYP3A4 based on in vitro studies with human hepatic microsomes. Canagliflozin is a weak inhibitor of P-gp. Canagliflozin is also a substrate of drug transporters P-glycoprotein (P-gp) and MRP2. In Vivo Assessment of Drug Interactions Table 9: Effect of Co–Administered Drugs on Systemic Exposures of Canagliflozin Co-Administered Drug Dose of Co-Administered Drug Single dose unless otherwise noted Dose of Canagliflozin Geometric Mean Ratio (Ratio With/Without Co-Administered Drug) No Effect = 1.0 AUC AUC inf for drugs given as a single dose and AUC 24h for drugs given as multiple doses (90% CI) C max (90% CI) QD = once daily; BID = twice daily See Drug Interactions (7) for the clinical relevance of the following: Rifampin 600 mg QD for 8 days 300 mg 0.49 (0.44; 0.54) 0.72 (0.61; 0.84) No dose adjustments of canagliflozin required for the following: Cyclosporine 400 mg 300 mg QD for 8 days 1.23 (1.19; 1.27) 1.01 (0.91; 1.11) Ethinyl estradiol and levonorgestrel 0.03 mg ethinyl estradiol and 0.15 mg levonorgestrel 200 mg QD for 6 days 0.91 (0.88; 0.94) 0.92 (0.84; 0.99) Hydrochlorothiazide 25 mg QD for 35 days 300 mg QD for 7 days 1.12 (1.08; 1.17) 1.15 (1.06; 1.25) Metformin HCl 2,000 mg 300 mg QD for 8 days 1.10 (1.05; 1.15) 1.05 (0.96; 1.16) Probenecid 500 mg BID for 3 days 300 mg QD for 17 days 1.21 (1.16; 1.25) 1.13 (1.00; 1.28) Table 10: Effect of Canagliflozin on Systemic Exposure of Co-Administered Drugs Co-Administered Drug Dose of Co-Administered Drug Single dose unless otherwise noted Dose of Canagliflozin Geometric Mean Ratio (Ratio With/Without Co-Administered Drug) No Effect = 1.0 AUC AUC inf for drugs given as a single dose and AUC 24h for drugs given as multiple doses (90% CI) C max (90% CI) QD = once daily; BID = twice daily; INR = International Normalized Ratio See Drug Interactions (7) for the clinical relevance of the following: Digoxin 0.5 mg QD first day followed by 0.25 mg QD for 6 days 300 mg QD for 7 days Digoxin 1.20 (1.12; 1.28) 1.36 (1.21; 1.53) No dose adjustments of co-administered drug required for the following: Acetaminophen 1,000 mg 300 mg BID for 25 days Acetaminophen 1.06 AUC 0–12h (0.98; 1.14) 1.00 (0.92; 1.09) Ethinyl estradiol and levonorgestrel 0.03 mg ethinyl estradiol and 0.15 mg levonorgestrel 200 mg QD for 6 days ethinyl estradiol 1.07 (0.99; 1.15) 1.22 (1.10; 1.35) Levonorgestrel 1.06 (1.00; 1.13) 1.22 (1.11; 1.35) Glyburide 1.25 mg 200 mg QD for 6 days Glyburide 1.02 (0.98; 1.07) 0.93 (0.85; 1.01) 3-cis-hydroxy-glyburide 1.01 (0.96; 1.07) 0.99 (0.91; 1.08) 4-trans-hydroxy-glyburide 1.03 (0.97; 1.09) 0.96 (0.88; 1.04) Hydrochlorothiazide 25 mg QD for 35 days 300 mg QD for 7 days Hydrochlorothiazide 0.99 (0.95; 1.04) 0.94 (0.87; 1.01) Metformin HCl 2,000 mg 300 mg QD for 8 days Metformin 1.20 (1.08; 1.34) 1.06 (0.93; 1.20) Simvastatin 40 mg 300 mg QD for 7 days Simvastatin 1.12 (0.94; 1.33) 1.09 (0.91; 1.31) simvastatin acid 1.18 (1.03; 1.35) 1.26 (1.10; 1.45) Warfarin 30 mg 300 mg QD for 12 days (R)-warfarin 1.01 (0.96; 1.06) 1.03 (0.94; 1.13) (S)-warfarin 1.06 (1.00; 1.12) 1.01 (0.90; 1.13) INR 1.00 (0.98; 1.03) 1.05 (0.99; 1.12) Metformin HCl Table 11: Effect of Co–Administered Drugs on Plasma Metformin Systemic Exposures Co-Administered Drug Dose of Co-Administered Drug Single dose unless otherwise noted Dose of Metformin HCl Geometric Mean Ratio (Ratio With/Without Co-Administered Drug) No Effect = 1.00 AUC AUC = AUC 0–∞ C max No dose adjustments required for the following: Glyburide 5 mg 500 mg Metformin HCl extended-release tablets 500 mg 0.98 Ratio of arithmetic means 0.99 Furosemide 40 mg 850 mg 1.09 1.22 Nifedipine 10 mg 850 mg 1.16 1.21 Propranolol 40 mg 850 mg 0.90 0.94 Ibuprofen 400 mg 850 mg 1.05 1.07 Drugs that are eliminated by renal tubular secretion increase the accumulation of metformin [see Warnings and Precautions (5) and Drug Interactions (7) ] Cimetidine 400 mg 850 mg 1.40 1.61 Carbonic anhydrase inhibitors may cause metabolic acidosis [see Warnings and Precautions (5) and Drug Interactions (7) ] Topiramate Healthy volunteer study at steady state with topiramate 100 mg every 12 hours and metformin 500 mg every 12 hours for 7 days. Study conducted to assess pharmacokinetics only 100 mg 500 mg 1.25 Steady state AUC 0–12h. 1.18 Table 12: Effect of Metformin HCl on Co–Administered Drug Systemic Exposures Co-Administered Drug Dose of Co-Administered Drug Single dose unless otherwise noted Dose of Metformin HCl Geometric Mean Ratio (Ratio With/Without Co-Administered Drug) No Effect = 1.00 AUC AUC = AUC 0–∞ C max No dose adjustments required for the following: Glyburide 5 mg 500 mg AUC 0–24 hr reported 0.78 Ratio of arithmetic means, p-value of difference <0.05 0.63 Furosemide 40 mg 850 mg 0.87 0.69 Nifedipine 10 mg 850 mg 1.10 1.08 Propranolol 40 mg 850 mg 1.01 0.94 Ibuprofen 400 mg 850 mg 0.97 Ratio of arithmetic means. 1.01 Cimetidine 400 mg 850 mg 0.95 1.01 Metformin is negligibly bound to plasma proteins and is, therefore, less likely to interact with highly protein-bound drugs such as salicylates, sulfonamides, chloramphenicol, and probenecid.