Teriparatide

1 INDICATIONS AND USAGE Teriparatide injection is indicated: For the treatment of postmenopausal women with osteoporosis at high risk for fracture (defined herein as having a history of osteoporotic fracture or multiple risk factors for fracture) or who have failed or are intolerant to other available osteoporosis therapy. In postmenopausal women with osteoporosis, teriparatide injection reduces the risk of vertebral and nonvertebral fractures. To increase bone mass in men with primary or hypogonadal osteoporosis at high risk for fracture or who have failed or are intolerant to other available osteoporosis therapy. For the treatment of men and women with osteoporosis associated with sustained systemic glucocorticoid therapy (daily dosage equivalent to 5 mg or greater of prednisone) at high risk for fracture or who have failed or are intolerant to other available osteoporosis therapy. Teriparatide injection is a parathyroid hormone analog, (PTH 1-34), indicated for: Treatment of postmenopausal women with osteoporosis at high risk for fracture or patients who have failed or are intolerant to other available osteoporosis therapy ( 1 ) Increase of bone mass in men with primary or hypogonadal osteoporosis at high risk for fracture or patients who have failed or are intolerant to other available osteoporosis therapy ( 1 ) Treatment of men and women with osteoporosis associated with sustained systemic glucocorticoid therapy at high risk for fracture or patients who have failed or are intolerant to other available osteoporosis therapy ( 1 )

2 DOSAGE AND ADMINISTRATION Recommended dosage is 20 mcg subcutaneously once a day ( 2.1 ) Consider supplemental calcium and Vitamin D based on individual patient needs ( 2.1 ) Administer as a subcutaneous injection into the thigh or abdominal region ( 2.2 ) Administer initially under circumstances in which the patient can sit or lie down if symptoms of orthostatic hypotension occur ( 2.2 ) Use of teriparatide for more than 2 years during a patient's lifetime should only be considered if a patient remains at or has returned to having a high risk for fracture ( 2.3 ) 2.1 Recommended Dosage The recommended dosage is 20 mcg given subcutaneously once a day. Instruct patients to take supplemental calcium and vitamin D if daily dietary intake is inadequate. 2.2 Administration Instructions Administer teriparatide injection as a subcutaneous injection into the thigh or abdominal region. Teriparatide injection is not approved for intravenous or intramuscular use. Teriparatide injection should be administered initially under circumstances in which the patient can sit or lie down if symptoms of orthostatic hypotension occur [see Warnings and Precautions ( 5.4 )] . Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration (teriparatide injection is a clear and colorless liquid). Do not use if solid particles appear or if the solution is cloudy or colored. Patients and/or caregivers who administer teriparatide injection should receive appropriate training and instruction on the proper use of the teriparatide injection delivery device from a qualified health professional. 2.3 Recommended Treatment Duration Use of teriparatide for more than 2 years during a patient's lifetime should only be considered if a patient remains at or has returned to having a high risk for fracture [see Warnings and Precautions ( 5.1 )] .

6 ADVERSE REACTIONS Most common adverse reactions (>10%) include: arthralgia, pain, and nausea ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Alvogen, Inc. at 1-866-770-3024 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in practice. Men with Primary or Hypogonadal Osteoporosis and Postmenopausal Women with Osteoporosis The safety of teriparatide in the treatment of osteoporosis in men and postmenopausal women was assessed in two randomized, double-blind, placebo-controlled trials of 1382 patients (21% men, 79% women) aged 28 to 86 years (mean 67 years) [see Clinical Studies ( 14.1 , 14.2 )] . The median durations of the trials were 11 months for men and 19 months for women, with 691 patients exposed to teriparatide and 691 patients to placebo. All patients received 1000 mg of calcium plus at least 400 IU of vitamin D supplementation per day. The incidence of all-cause mortality was 1% in the teriparatide group and 1% in the placebo group. The incidence of serious adverse events was 16% in the teriparatide group and 19% in the placebo group. Early discontinuation due to adverse events occurred in 7% in the teriparatide group and 6% in the placebo group. Table 1 lists adverse events from these two trials that occurred in ≥2% of teriparatide-treated and more frequently than placebo-treated patients. Table 1. Percentage of Patients with Adverse Events Reported by at Least 2% of Teriparatide-Treated Patients and in More Teriparatide-Treated Patients than Placebo-Treated Patients from the Two Principal Osteoporosis Trials in Women and Men (Adverse Events are Shown Without Attribution of Causality) Teriparatide N=691 Placebo N=691 Event Classification (%) (%) Body as a Whole Pain 21.3 20.5 Headache 7.5 7.4 Asthenia 8.7 6.8 Neck pain 3.0 2.7 Cardiovascular Hypertension 7.1 6.8 Angina pectoris 2.5 1.6 Syncope 2.6 1.4 Digestive System Nausea 8.5 6.7 Constipation 5.4 4.5 Diarrhea 5.1 4.6 Dyspepsia 5.2 4.1 Vomiting 3.0 2.3 Gastrointestinal disorder 2.3 2.0 Tooth disorder 2.0 1.3 Musculoskeletal Arthralgia 10.1 8.4 Leg cramps 2.6 1.3 Nervous System Dizziness 8.0 5.4 Depression 4.1 2.7 Insomnia 4.3 3.6 Vertigo 3.8 2.7 Respiratory System Rhinitis 9.6 8.8 Cough increased 6.4 5.5 Pharyngitis 5.5 4.8 Dyspnea 3.6 2.6 Pneumonia 3.9 3.3 Skin and Appendages Rash 4.9 4.5 Sweating 2.2 1.7 Laboratory Findings Serum Calcium - Teriparatide transiently increased serum calcium, with the maximal effect observed at approximately 4 to 6 hours post-dose. Serum calcium measured at least 16 hours post-dose was not different from pretreatment levels. In clinical trials, the frequency of at least 1 episode of transient hypercalcemia in the 4 to 6 hours after teriparatide administration was 11% of women and 6% of men treated with teriparatide compared to 2% of women and 0% of the men treated with placebo. The percentage of patients treated with teriparatide whose transient hypercalcemia was verified on consecutive measurements was 3% of women and 1% of men. Urinary Calcium - Teriparatide increased urinary calcium excretion, but the frequency of hypercalciuria in clinical trials was similar for patients treated with teriparatide and placebo [see Clinical Pharmacology ( 12.2 )] . Serum Uric Acid - Teriparatide increased serum uric acid concentrations. In clinical trials, 3% of teriparatide-treated patients had serum uric acid concentrations above the upper limit of normal compared with 1% of placebo-treated patients. However, the hyperuricemia did not result in an increase in gout, arthralgia, or urolithiasis. Renal Function - No clinically important adverse renal effects were observed in clinical studies. Assessments included creatinine clearance; measurements of blood urea nitrogen (BUN), creatinine, and electrolytes in serum; urine specific gravity and pH; and examination of urine sediment. Men and Women with Glucocorticoid-Induced Osteoporosis The safety of teriparatide in the treatment of men and women with glucocorticoid-induced osteoporosis was assessed in a randomized, double-blind, active-controlled trial of 428 patients (19% men, 81% women) aged 22 to 89 years (mean 57 years) treated with ≥5 mg per day prednisone or equivalent for a minimum of 3 months [see Clinical Studies ( 14.3 )] . The duration of the trial was 18 months with 214 patients exposed to teriparatide and 214 patients exposed to an oral daily bisphosphonate (active control). All patients received 1000 mg of calcium plus 800 IU of vitamin D supplementation per day. There was no increase in mortality in the teriparatide group compared to the active control group. The incidence of serious adverse events was 21% in teriparatide patients and 18% in active control patients, and included pneumonia (3% teriparatide, 1% active control). Early discontinuation because of adverse events occurred in 15% of teriparatide patients and 12% of active control patients, and included dizziness (2% teriparatide, 0% active control). Adverse events reported at a higher incidence in the teriparatide group and with at least a 2% difference in teriparatide-treated patients compared with active control-treated patients were: nausea (14%, 7%), gastritis (7%, 3%), pneumonia (6%, 3%), dyspnea (6%, 3%), insomnia (5%, 1%), anxiety (4%, 1%), and herpes zoster (3%, 1%), respectively. 6.2 Postmarketing Experience Adverse Reactions from Postmarketing Spontaneous Reports The following adverse reactions have been identified during post-approval use of teriparatide. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Cases of bone tumor and osteosarcoma have been reported rarely in the postmarketing period [see Warnings and Precautions ( 5.1 )] . Hypercalcemia greater than 13 mg/dL has been reported with teriparatide use. Adverse events reported since market introduction that were temporally related to teriparatide therapy include the following: Allergic Reactions: Anaphylactic reactions, drug hypersensitivity, angioedema, urticaria Investigations: Hyperuricemia Respiratory System: Acute dyspnea, chest pain Musculoskeletal: Muscle spasms of the leg or back Other: Injection site reactions including injection site pain, swelling and bruising; oro-facial edema Adverse Reactions from Observational Studies to Assess Incidence of Osteosarcoma Two osteosarcoma surveillance safety studies (U.S. claims-based database studies) were designed to obtain data on the incidence rate of osteosarcoma among teriparatide-treated patients. In these two studies, three and zero osteosarcoma cases were identified among 379,283 and 153,316 teriparatide users, respectively. The study results suggest a similar risk for osteosarcoma between teriparatide users and their comparators. However, the interpretation of the study results calls for caution owing to the limitations of the data sources which do not allow for complete measurement and control for confounders.

12.3 Pharmacokinetics The pharmacokinetic parameters of teriparatide following single subcutaneous administration of teriparatide injection in patients with osteoporosis are shown in Table 2. Table 2. Pharmacokinetic Parameters of Teriparatide Following Administration of a Single Dose, 20 mcg, of Teriparatide Injection Mean ± S.D. n Arithmetic mean ± S.D.; *T max = median (minimum, maximum) T max (hour)* 0.25 (0.12, 1.08) 83 C max (pg/mL) 109.5 ± 62.8 83 AUC 0-t (pg∙hr/mL) 134.8 ± 79.7 83 AUC 0-inf (pg∙hr/mL) 149.8 ± 68.1 72 t 1/2 (hour) 0.79 ± 0.35 72 Absorption — Teriparatide is absorbed after subcutaneous injection; the absolute bioavailability is approximately 95% based on pooled data from 20-, 40-, and 80-mcg doses (1-, 2-, and 4-times the recommended dosage, respectively). The peptide reaches peak serum concentrations about 30 minutes after subcutaneous injection of a 20-mcg dose and declines to non-quantifiable concentrations within 3 hours. Distribution — Volume of distribution following intravenous injection is approximately 0.12 L/kg. Elimination — Systemic clearance of teriparatide (approximately 62 L/hour in women and 94 L/hour in men) exceeds the rate of normal liver plasma flow, consistent with both hepatic and extra-hepatic clearance. No metabolism or excretion studies have been performed with teriparatide. Peripheral metabolism of PTH is believed to occur by non-specific enzymatic mechanisms in the liver followed by excretion via the kidneys. Specific Populations Geriatric Patients - No age-related differences in teriparatide pharmacokinetics were detected (range 31 to 85 years). Male and Female Patients - Although systemic exposure to teriparatide was approximately 20% to 30% lower in men than women, the recommended dosage for men and women is the same. Racial Groups - The influence of race has not been determined. Patients with Renal Impairment - No pharmacokinetic differences were identified in 11 patients with creatinine clearance (CrCl) 30 to 72 mL/minute administered a single dose of teriparatide. In 5 patients with severe renal impairment (CrCl <30 mL/minute), the AUC and T1/2 of teriparatide were increased by 73% and 77%, respectively. Maximum serum concentration of teriparatide was not increased. No studies have been performed in patients undergoing dialysis for chronic renal failure. Patients with Hepatic Impairment - No studies have been performed in patients with hepatic impairment. Non-specific proteolytic enzymes in the liver (possibly Kupffer cells) cleave PTH(1-34) and PTH(1-84) into fragments that are cleared from the circulation mainly by the kidney. Drug Interaction Studies Digoxin — In a study of 15 healthy people administered digoxin daily to steady state, a single teriparatide dose did not alter the effect of digoxin on the systolic time interval (from electrocardiographic Q-wave onset to aortic valve closure, a measure of digoxin's calcium-mediated cardiac effect). Hydrochlorothiazide — In a study of 20 healthy people, the coadministration of hydrochlorothiazide 25 mg with 40 mcg of teriparatide (2 times the recommended dose) did not affect the serum calcium response to teriparatide. The 24-hour urine excretion of calcium was reduced by a clinically unimportant amount (15%). The effect of coadministration of a higher dose of hydrochlorothiazide with teriparatide on serum calcium levels has not been studied. Furosemide — In a study of 9 healthy people and 17 patients with CrCl 13 to 72 mL/minute, coadministration of intravenous furosemide (20 to 100 mg) with teriparatide 40 mcg (2 times the recommended dose) resulted in small increases in the serum calcium (2%) and 24-hour urine calcium (37%); however, these changes did not appear to be clinically important.