Bupivacaine

1. INDICATIONS AND USAGE Bupivacaine liposome injectable suspension is indicated to produce postsurgical: Local analgesia via infiltration in adults Regional analgesia via an interscalene brachial plexus nerve block in adults Limitations of Use The safety and effectiveness of bupivacaine liposome injectable suspension have not been established to produce postsurgical regional analgesia via other nerve blocks besides an interscalene brachial plexus nerve block. Bupivacaine liposome injectable suspension contains bupivacaine, an amide local anesthetic, and is indicated to produce postsurgical: Local analgesia via infiltration in adults ( 1 ). Regional analgesia via an interscalene brachial plexus nerve block in adults ( 1 ). Limitations of Use The safety and effectiveness of bupivacaine liposome injectable suspension have not been established to produce postsurgical regional analgesia via other nerve blocks besides an interscalene brachial plexus nerve block.

2. DOSAGE AND ADMINISTRATION Bupivacaine liposome injectable suspension is for single administration only ( 2.1 ). Bupivacaine liposome injectable suspension is not substitutable with other bupivacaine products even if the strength is the same. Therefore, it is not possible to convert a dose from other bupivacaine products to a bupivacaine liposome injectable suspension dose and vice versa ( 2.1 , 2.5 ). Do not dilute bupivacaine liposome injectable suspension with water or other hypotonic solutions ( 2.1 ). The recommended dose of bupivacaine liposome injectable suspension for: Local infiltration in adults is up to a maximum dose of 266 mg. See Full Prescribing Information for guidance on dose selection ( 2.2 ). Interscalene brachial plexus nerve block in adults is 133 mg ( 2.3 ). For the nerve block, administer additional analgesics, which may include other immediate-release local anesthetics, as appropriate ( 2.3 ). See Full Prescribing Information for important preparation and administration instructions and compatibility considerations ( 2.4 , 2.5 ). 2.1 Important Dose, Preparation, and Administration Instructions Bupivacaine liposome injectable suspension is for single administration only. Bupivacaine liposome injectable suspension is not substitutable with other bupivacaine products even if the strength is the same. Therefore, it is not possible to convert a dose from other bupivacaine products to a bupivacaine liposome injectable suspension dose and vice versa. Do not dilute bupivacaine liposome injectable suspension with water or other hypotonic agents, as it will result in disruption of the liposomal particles. Do not administer bupivacaine liposome injectable suspension if it is suspected that the vial has been frozen or exposed to high temperature (greater than 40°C or 104°F) for an extended period. Inspect bupivacaine liposome injectable suspension visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Do not administer bupivacaine liposome injectable suspension if the product is discolored. Do not heat or autoclave before use. Do not filter during administration. 2.2 Recommended Dose for Local Analgesia via Infiltration Local Analgesia via Infiltration in Adults The recommended dose of bupivacaine liposome injectable suspension for local infiltration in adults is up to a maximum dose of 266 mg, and is based on the following factors: Size of the surgical site Volume required to cover the area Individual patient factors that may impact the safety of an amide local anesthetic As general guidance in selecting the proper bupivacaine liposome injectable suspension dose for local infiltration in adults, two examples are provided [ see Clinical Studies ( 14.2 )]. In adult patients undergoing: Bunionectomy, a total of 106 mg (8 mL) of bupivacaine liposome injectable suspension was administered, with 7 mL infiltrated into the tissues surrounding the osteotomy, and 1 mL infiltrated into the subcutaneous tissue. Hemorrhoidectomy, a total of 266 mg (20 mL) of bupivacaine liposome injectable suspension was diluted with 10 mL of saline, for a total of 30 mL, divided into six 5 mL aliquots, injected by visualizing the anal sphincter as a clock face and slowly infiltrating one aliquot to each of the even numbers to produce a field block. 2.3 Recommended Dose for Regional Analgesia The maximum recommended dose of bupivacaine liposome injectable suspension via perineural use for interscalene brachial plexus nerve block is 133 mg. For all nerve blocks, administer additional analgesics, which may include other immediate-release local anesthetics, as appropriate. Regional Analgesia via Interscalene Brachial Plexus Nerve Block in Adults The recommended dose of bupivacaine liposome injectable suspension for interscalene brachial plexus nerve block in adults is 133 mg and is based upon one study of patients undergoing either total shoulder arthroplasty or rotator cuff repair [ see Clinical Studies ( 14.3 ) ]. 2.4 Preparation and Administration Instructions Invert vials of bupivacaine liposome injectable suspension multiple times to re-suspend the particles immediately prior to withdrawal from the vial. Administer bupivacaine liposome injectable suspension (1) undiluted or (2) diluted to increase volume up to a final concentration of 0.89 mg/mL (i.e., 1:14 dilution by volume) with 0.9% preservative-free Sodium Chloride Injection or lactated Ringer’s solution. Use diluted bupivacaine liposome injectable suspension within 4 hours of preparation in a syringe. Administer bupivacaine liposome injectable suspension with a 25 gauge or larger bore needle to maintain the structural integrity of the liposomal bupivacaine particles. Administer bupivacaine liposome injectable suspension slowly via infiltration or perineural use with frequent aspiration to check for blood and minimize the risk of inadvertent intravascular injection. Discard unused portion. 2.5 Compatibility Considerations Some physicochemical incompatibilities exist between bupivacaine liposome injectable suspension and certain other drugs. Direct contact of bupivacaine liposome injectable suspension with these drugs results in a rapid increase in free (unencapsulated) bupivacaine, altering bupivacaine liposome injectable suspension characteristics and potentially affecting the safety and efficacy of bupivacaine liposome injectable suspension. Therefore, admixing bupivacaine liposome injectable suspension with other drugs prior to administration is not recommended [ see Drug Interactions ( 7 ) ]. Non-bupivacaine based local anesthetics, including lidocaine, may cause an immediate release of bupivacaine from bupivacaine liposome injectable suspension if administered together locally. The administration of bupivacaine liposome injectable suspension may follow the administration of lidocaine after a delay of 20 minutes or more. Bupivacaine HCl administered together with bupivacaine liposome injectable suspension may impact the pharmacokinetic and/or physicochemical properties of bupivacaine liposome injectable suspension, and this effect is concentration dependent. Therefore, bupivacaine HCl and bupivacaine liposome injectable suspension may be administered simultaneously in the same syringe, and bupivacaine HCl may be injected immediately before bupivacaine liposome injectable suspension if the ratio of the milligram dose of bupivacaine HCl solution to bupivacaine liposome injectable suspension does not exceed 1:2. The toxic effects of these drugs are additive, and their administration should be used with caution including monitoring for neurologic and cardiovascular effects related to local anesthetic systemic toxicity [ see Warnings and Precautions ( 5.1 ) and Overdosage ( 10 ) ]. When a topical antiseptic such as povidone iodine (e.g., Betadine) is applied, the site should be allowed to dry before bupivacaine liposome injectable suspension is administered into the site. Bupivacaine liposome injectable suspension should not be allowed to come into contact with antiseptics such as povidone iodine in solution. Studies conducted with bupivacaine liposome injectable suspension demonstrated that the most common implantable materials (polypropylene, PTFE, silicone, stainless steel, and titanium) are not affected by the presence of bupivacaine liposome injectable suspension any more than they are by saline. None of the materials studied had an adverse effect on bupivacaine liposome injectable suspension.

6. ADVERSE REACTIONS The following serious adverse reactions have been associated with bupivacaine hydrochloride in clinical trials and are described in greater detail in other sections of the labeling: Central Nervous System Reactions [ see Warnings and Precautions ( 5.1 ) ] Cardiovascular System Reactions [ see Warnings and Precautions ( 5.1 ) ] Allergic Reactions [ see Warnings and Precautions ( 5.1 ) ] Chondrolysis [ see Warnings and Precautions ( 5.1 ) ] Methemoglobinemia [ see Warnings and Precautions ( 5.1 ) ] Accidental intravascular injection [ see Warnings and Precautions ( 5.2 ) ] Adverse reactions reported with an incidence greater than or equal to 10% following bupivacaine liposome injectable suspension administration via: Infiltration in adults were nausea, constipation, and vomiting ( 6.1 ). Nerve block in adults were nausea, pyrexia, headache, and constipation ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact eVenus Pharmaceutical Laboratories, Inc. at 1-609-395-8625 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 trials 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. Adverse Reactions Reported in All Local Infiltration Clinical Studies in Adults The safety of bupivacaine liposome injectable suspension (local administration into the surgical site) was evaluated in 10 randomized, double-blind, clinical studies (including Studies 1 and 2 [ see Clinical Studies ( 14.2 ) ]) that included 823 adult patients who had various surgical procedures. Patients were administered a bupivacaine liposome injectable suspension dose ranging from 66 to 532 mg (two times the maximum recommended dose of 266 mg). In these studies, following bupivacaine liposome injectable suspension administration, the: Most common adverse reactions (incidence greater than or equal to 10%) were nausea, constipation, and vomiting. Common adverse reactions (incidence greater than or equal to 2% to less than 10%) were pyrexia, dizziness, peripheral edema, anemia, hypotension, pruritus, tachycardia, headache, insomnia, postoperative anemia, muscle spasms, hemorrhagic anemia, back pain, somnolence, and procedural pain. Less common adverse reactions (incidence less than 2%) were chills, erythema, bradycardia, anxiety, urinary retention, pain, edema, tremor, postural dizziness, paresthesia, syncope, incision site edema, procedural hypertension, procedural hypotension, procedural nausea, muscular weakness, neck pain, generalized pruritus, pruritic rash, hyperhidrosis, cold sweat, urticaria, palpitations, sinus bradycardia, supraventricular extrasystoles, ventricular extrasystoles, ventricular tachycardia, hypertension, pallor, anxiety, confusional state, depression, agitation, restlessness, hypoxia, laryngospasm, apnea, respiratory depression, respiratory failure, increased body temperature, increased blood pressure (BP),decreased BP, decreased oxygen saturation, urinary incontinence, blurred vision, tinnitus, drug hypersensitivity, and hypersensitivity. Neurological and Cardiac Adverse Reactions In the bupivacaine liposome injectable suspension surgical site infiltration studies, following bupivacaine liposome injectable suspension administration adverse reactions with an incidence greater than or equal to 1% in the: Nervous System Disorders system organ class were dizziness (6.2%), headache (3.8%), somnolence (2.1%), hypoesthesia (1.5%), and lethargy (1.3%). Cardiac Disorders system organ class were tachycardia (3.9%) and bradycardia (1.6%). Adverse Reactions Reported in All Local Infiltration Placebo-Controlled Trials in Adults Adverse reactions with an incidence greater than or equal to 2% reported by adult patients in clinical studies who underwent a bunionectomy (Study 1) or hemorrhoidectomy (Study 2) [ see Clinical Studies ( 14.2 ) ] that compared 106 mg of bupivacaine liposome injectable suspension (8 mL) to placebo and 266 mg of bupivacaine liposome injectable suspension (20 mL) to placebo are shown in Table 1. Table 1: Treatment-Emergent Adverse Reactions with an Incidence Greater than or Equal to 2%: Local Infiltration Placebo-Controlled Studies in Adults (Studies 1 and 2) a Study 1: Bunionectomy b Study 2: Hemorrhoidectomy; TEAE = treatment-emergent adverse event. At each level of summation (overall, system organ class, preferred term), patients are only counted once. Preferred terms are included where at least 2% of patients reported the event in any treatment group. STUDY 1 a STUDY 2 b Bupivacaine Liposome Injectable Suspension Placebo Bupivacaine Liposome Injectable Suspension Placebo System Organ Class Preferred Term (106 mg) (N=97) n (%) (N=96) n (%) (266 mg) (N=95) n (%) (N=94) n (%) Any TEAE 53 (54.6) 59 (61.5) 10 (10.5) 17 (18.1) Gastrointestinal Disorders 41 (42.3) 38 (39.6) 7 (7.4) 13 (13.8) Nausea 39 (40.2) 36 (37.5) 2 (2.1) 1 (1.1) Vomiting 27 (27.8) 17 (17.7) 2 (2.1) 4 (4.3) Constipation 2 (2.1) 1 (1.0) 2 (2.1) 2 (2.1) Anal Hemorrhage 0 (0.0) 0 (0.0) 3 (3.2) 4 (4.3) Painful Defecation 0 (0.0) 0 (0.0) 2 (2.1) 5 (5.3) Rectal Discharge 0 (0.0) 0 (0.0) 1 (1.1) 3 (3.2) Nervous System Disorders 20 (20.6) 30 (31.3) 0 (0.0) 0 (0.0) Dizziness 11 (11.3) 25 (26.0) 0 (0.0) 0 (0.0) Headache 5 (5.2) 8 (8.3) 0 (0.0) 0 (0.0) Somnolence 5 (5.2) 1 (1.0) 0 (0.0) 0 (0.0) Syncope 2 (2.1) 0 (0.0) 0 (0.0) 0 (0.0) Skin And Subcutaneous Tissue Disorders 8 (8.2) 7 (7.3) 0 (0.0) 0 (0.0) Generalized Pruritus 5 (5.2) 6 (6.3) 0 (0.0) 0 (0.0) Pruritus 3 (3.1) 1 (1.0) 0 (0.0) 0 (0.0) Investigations 5 (5.2) 3 (3.1) 4 (4.2) 3 (3.2) Increased Alanine Aminotransferase 3 (3.1) 3 (3.1) 1 (1.1) 0 (0.0) Increased Aspartate Aminotransferase 3 (3.1) 2 (2.1) 0 (0.0) 0 (0.0) Increased Blood Creatinine 2 (2.1) 0 (0.0) 0 (0.0) 0 (0.0) Increased Body Temperature 0 (0.0) 0 (0.0) 3 (3.2) 3 (3.2) General Disorders and Administration Site Conditions 4 (4.1) 0 (0.0) 1 (1.1) 1 (1.1) Feeling Hot 2 (2.1) 0 (0.0) 0 (0.0) 0 (0.0) Pyrexia 2 (2.1) 0 (0.0) 1 (1.1) 1 (1.1) Infections And Infestations 2 (2.1) 1 (1.0) 0 (0.0) 0 (0.0) Fungal Infection 2 (2.1) 1 (1.0) 0 (0.0) 0 (0.0) Injury, Poisoning and Procedural Complications 2 (2.1) 0 (0.0) 0 (0.0) 0 (0.0) Post Procedural Swelling 2 (2.1) 0 (0.0) 0 (0.0) 0 (0.0) Metabolism And Nutrition Disorders 2 (2.1) 2 (2.1) 0 (0.0) 0 (0.0) Decreased Appetite 2 (2.1) 2 (2.1) 0 (0.0) 0 (0.0) Adverse Reactions Reported in Placebo-Controlled Nerve Block Clinical Studies in Adults The safety of bupivacaine liposome injectable suspension was evaluated in four randomized, double-blind, placebo-controlled nerve block clinical studies (Studies 3, 6, 7, 8) [ see Clinical Studies ( 14.3 , 14.4 )] involving 469 bupivacaine liposome injectable suspension-treated adult patients and 357 placebo-treated patients who had various surgical procedures. Patients were administered placebo or a bupivacaine liposome injectable suspension dose of either 133 or 266 mg (two times the maximum recommended dose for these nerve blocks). In these studies, following bupivacaine liposome injectable suspension administration via nerve block (perineural use) the: Most Common adverse reactions (incidence greater than or equal to 10%) were nausea, pyrexia, and constipation. Common adverse reactions (incidence greater than or equal to 2% to less than 10%) were muscle twitching, dysgeusia, urinary retention, fatigue, headache, confusional state, hypotension, hypertension, oral hypoesthesia, generalized pruritus, hyperhidrosis, tachycardia, sinus tachycardia, anxiety, fall, increased body temperature, peripheral edema, sensory loss, increased hepatic enzyme, hiccups, hypoxia, and post-procedural hematoma. Less common adverse reactions (incidence less than 2%) were arrhythmia, atrial fibrillation, first degree atrioventricular block, bradycardia, left bundle branch block, right bundle branch block, cardiac arrest, impaired hearing, blurred vision, visual impairment, asthenia, chills, hyperthermia, cellulitis, lung infection, pneumonia, procedural nausea, wound dehiscence, wound secretion, electrocardiogram QT prolonged, white blood cell count increased, arthralgia, back pain, joint swelling, decreased mobility, muscle spasms, muscular weakness, musculoskeletal pain, paraesthesia, presyncope, sedation, somnolence, syncope, delirium, dysuria, urinary incontinence, atelectasis, cough, dyspnea, lung infiltration, blister, drug eruption, erythema, rash, urticaria, deep vein thrombosis, hematoma, and orthostatic hypotension. The most common and common adverse reactions for the four randomized, double-blind, placebo-controlled nerve block clinical studies (Studies 3, 6, 7, 8) are shown in Table 3. Neurological and Cardiac Adverse Reactions In the bupivacaine liposome injectable suspension nerve block placebo-controlled studies, following bupivacaine liposome injectable suspension administration adverse reactions with an incidence greater than or equal to 1% in the: Nervous System Disorders system organ class were motor dysfunction (14.9%), dysgeusia (7.2%), headache (5.1%), hypoesthesia (2.3%), and sensory loss (2.3%). Cardiac Disorders system organ class were tachycardia (3%), sinus tachycardia (2.3%), and bradycardia (1.3%). Table 3: Treatment-Emergent Adverse Reactions with an Incidence Greater than or Equal to 2%: Nerve Block Placebo-Controlled Studies (Studies 3, 6, 7, and 8) At each level of summation (overall, system organ class, preferred term), patients are only counted once. Preferred terms are included where at least 2% of patients reported the event in any treatment group. TEAE = treatment-emergent adverse event. SYSTEM ORGAN CLASS Preferred Term Bupivacaine Liposome Injectable Suspension 133 mg (N=168) n (%) Bupivacaine Liposome Injectable Suspension 266 mg (N=301) n (%) Placebo (N=357) n (%) Number of Patients with at Least One TEAE 152 (90.5) 260 (86.4) 299 (83.8) Blood and Lymphatic System Disorders 2 (1.2) 22 (7.3) 15 (4.2) Anemia 2 (1.2) 18 (6.0) 13 (3.6) Cardiac Disorders 13 (7.7) 34 (11.3) 38 (10.6) Atrial Fibrillation 1 (0.6) 4 (1.3) 8 (2.2) Sinus Tachycardia 3 (1.8) 8 (2.7) 4 (1.1) Tachycardia 3 (1.8) 11 (3.7) 10 (2.8) Gastrointestinal Disorders 84 (50.0) 154 (51.2) 184 (51.5) Constipation 29 (17.3) 66 (21.9) 68 (19.0) Dyspepsia 3 (1.8) 7 (2.3) 7 (2.0) Oral Hypoesthesia 6 (3.6) 8 (2.7) 7 (2.0) Nausea 62 (36.9) 111 (36.9) 133 (37.3) Vomiting 17 (10.1) 55 (18.3) 73 (20.4) General Disorders and Administration Site Conditions 52 (31.0) 102 (33.9) 91 (25.5) Fatigue 7 (4.2) 15 (5.0) 15 (4.2) Feeling Cold 0 10 (3.3) 8 (2.2) Peripheral Edema 4 (2.4) 6 (2.0) 8 (2.2) Peripheral Swelling 3 (1.8) 8 (2.7) 4 (1.1) Pyrexia 36 (21.4) 70 (23.3) 64 (17.9) Injury, Poisoning and Procedural Complications 18 (10.7) 44 (14.6) 32 (9.0) Postoperative Anemia 0 8 (2.7) 10 (2.8) Contusion 4 (2.4) 1 (0.3) 0 Fall 4 (2.4) 8 (2.7) 1 (0.3) Post Procedural Hematoma 4 (2.4) 1 (0.3) 0 Procedural Hypotension 2 (1.2) 13 (4.3) 7 (2.0) Investigations 18 (10.7) 31 (10.3) 31 (8.7) Increased Body Temperature 1 (0.6) 10 (3.3) 4 (1.1) Increased Hepatic Enzyme 7 (4.2) 1 (0.3) 3 (0.8) Metabolism and Nutrition Disorders 13 (7.7) 18 (6.0) 25 (7.0) Hypokalemia 7 (4.2) 9 (3.0) 14 (3.9) Musculoskeletal and Connective Tissue Disorders 22 (13.1) 47 (15.6) 41 (11.5) Decreased Mobility 0 6 (2.0) 5 (1.4) Muscle Twitching 14 (8.3) 21 (7.0) 25 (7.0) Nervous System Disorders 72 (42.9) 101 (33.6) 112 (31.4) Dizziness 8 (4.8) 28 (9.3) 40 (11.2) Dysgeusia 12 (7.1) 22 (7.3) 21 (5.9) Headache 14 (8.3) 10 (3.3) 10 (2.8) Hypoesthesia 6 (3.6) 5 (1.7) 2 (0.6) Motor Dysfunction 35 (20.8) 35 (11.6) 37 (10.4) Sensory Loss 4 (2.4) 7 (2.3) 1 (0.3) Psychiatric Disorders 10 (6.0) 33 (11.0) 44 (12.3) Anxiety 3 (1.8) 9 (3.0) 6 (1.7) Confusional State 3 (1.8) 15 (5.0) 14 (3.9) Insomnia 5 (3.0) 10 (3.3) 19 (5.3) Renal and Urinary Disorders 9 (5.4) 31 (10.3) 31 (8.7) Urinary Retention 5 (3.0) 23 (7.6) 22 (6.2) Respiratory, Thoracic and Mediastinal Disorders 18 (10.7) 30 (10.0) 31 (8.7) Dyspnea 2 (1.2) 4 (1.3) 8 (2.2) Hiccups 4 (2.4) 4 (1.3) 1 (0.3) Hypoxia 4 (2.4) 3 (1.0) 3 (0.8) Skin and Subcutaneous Tissue Disorders 24 (14.3) 63 (20.9) 84 (23.5) Hyperhidrosis 1 (0.6) 14 (4.7) 15 (4.2) Pruritus 10 (6.0) 45 (15.0) 55 (15.4) Generalized Pruritus 6 (3.6) 7 (2.3) 14 (3.9) Vascular Disorders 16 (9.5) 30 (10.0) 44 (12.3) Hypertension 3 (1.8) 15 (5.0) 21 (5.9) Hypotension 11 (6.5) 8 (2.7) 19 (5.3) 6.2 Postmarketing Experience Because adverse reactions reported during postmarketing 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. These adverse reactions are consistent with those observed in clinical studies and most commonly involve the following system organ classes: Injury, Poisoning, and Procedural Complications (e.g., drug-drug interaction, procedural pain), Nervous System Disorders (e.g., palsy, seizure), General Disorders And Administration Site Conditions (e.g., lack of efficacy, pain), Skin And Subcutaneous Tissue Disorders (e.g., erythema, rash), and Cardiac Disorders (e.g., bradycardia, cardiac arrest).

12.3 Pharmacokinetics After administration of bupivacaine liposome injectable suspension, the systemic plasma levels of bupivacaine were observed for 96 hours after local infiltration and 120 hours after interscalene brachial plexus nerve block. [ see Warnings and Precautions ( 5.2 ) ]. In general, peripheral nerve blocks have shown systemic plasma levels of bupivacaine for extended duration when compared to local infiltration. Systemic plasma levels of bupivacaine following administration of bupivacaine liposome injectable suspension are not correlated with local efficacy. Absorption The rate of systemic absorption of bupivacaine is dependent upon the total dose of bupivacaine liposome injectable suspension administered, the route of administration, and the vascularity of the administration site. Pharmacokinetic parameters of bupivacaine liposome injectable suspension after local infiltration and following an interscalene brachial plexus nerve block were evaluated following surgical procedures. Descriptive statistics of pharmacokinetic parameters of representative bupivacaine liposome injectable suspension doses in each study are provided in Table 5 for adult patients after administration of single doses of bupivacaine liposome injectable suspension via local infiltration; and Table 6 for adult patients after administration of single doses of bupivacaine liposome injectable suspension via nerve block. Table 5: Summary of Pharmacokinetic Parameters for Bupivacaine after Administration of Single Doses of Bupivacaine Liposome Injectable Suspension via Local Infiltration in Adult Patients * Arithmetic mean (standard deviation) except T max where it is median (minimum, maximum). 1 Patients undergoing bunionectomy (Study 1) 2 Patients undergoing hemorrhoidectomy (Study 2) 3 Patients undergoing open posterior spinal fusion or reconstructive surgery 4 Patients undergoing posterolateral thoracotomy 5 AUC 0-last , 0-72h; 6 AUC 0-last , 0-96h ; NE: Not evaluated Parameters* Bunionectomy 1 106 mg (8 mL) Hemorrhoidectomy 2 266 mg (20 mL) Spine Surgery 3 266 mg (20 mL) Cardiothoracic Surgery 4 266 mg (20 mL) (N=26) (N=25) (N=11) (N=5) C max (ng/mL) 166 (93) 867 (353) 513 (268) 445 (120) T max (h) 2 (0.5, 24) 0.5 (0.25, 36) 0.6 (0.2, 37) 0.6 (0.6, 36) AUC 0-40h (h x ng/mL) NE NE 13035 (8782) 9867 (1332) AUC (0-last) (h x ng/mL) 5864 (2038) 5 16867 (7868) 5 17214 (11621) 6 14277 (3449) 6 AUC (inf) (h x ng/mL) 7105 (2283) 18289 (7569) 17917 (12187) 15768 (4530) t ½ (h) 34 (17) 24 (39) 9 (2) 14 (6) Table 6: Summary of Pharmacokinetic Parameters for Bupivacaine after Administration of Single Doses of Bupivacaine Liposome Injectable Suspension via Nerve Block in Adult Patients (Study 3) * Arithmetic mean (standard deviation) except T max where it is median (minimum, maximum). 1 Patients undergoing total shouder arthroplasty (Study 3) 4 AUC 0-last , 0-120h; NE: Not evaluated Parameters* Interscalene Brachial Plexus Nerve Block 1 Bupivacaine Liposome Injectable Suspension 133 mg (10 mL) (N = 12) C max (ng/mL) 207 (137) T max (h) 48 (3, 74) AUC (0-last) (h x ng/mL) 11484 (8615) 4 AUC (inf) (h x ng/mL) 11590 (8603) t ½ (h) 11 (5) Distribution After bupivacaine has been released from bupivacaine liposome injectable suspension and is absorbed systemically, bupivacaine distribution is expected to be the same as for any bupivacaine HCl solution formulation. Local anesthetics including bupivacaine are distributed to some extent to all body tissues, with high concentrations found in highly perfused organs such as the liver, lungs, heart, and brain. Local anesthetics including bupivacaine appear to cross the placenta by passive diffusion. The rate and degree of diffusion is governed by (1) the degree of plasma protein binding, (2) the degree of ionization, and (3) the degree of lipid solubility. Fetal/maternal ratios of local anesthetics appear to be inversely related to the degree of plasma protein binding, because only the free, unbound drug is available for placental transfer. Bupivacaine with a high protein binding capacity (95%) has a low fetal/maternal ratio (0.2 to 0.4). The extent of placental transfer is also determined by the degree of ionization and lipid solubility of the drug. Lipid soluble, non-ionized drugs such as bupivacaine readily enter the fetal blood from the maternal circulation. Elimination Metabolism Amide-type local anesthetics, such as bupivacaine, are metabolized primarily in the liver via conjugation with glucuronic acid. Pipecoloxylidide (PPX) is the major metabolite of bupivacaine; approximately 5% of bupivacaine is converted to PPX. Elimination of drug depends largely upon the availability of plasma protein binding sites in the circulation to carry it to the liver where it is metabolized. Various pharmacokinetic parameters of the local anesthetics can be significantly altered by the presence of hepatic disease. Patients with hepatic disease, especially those with severe hepatic disease, may be more susceptible to the potential toxicities of the amide-type local anesthetics. Excretion After bupivacaine has been released from bupivacaine liposome injectable suspension and is absorbed systemically, bupivacaine excretion is expected to be the same as for other bupivacaine formulations. The kidney is the main excretory organ for most local anesthetics and their metabolites. Only 6% of bupivacaine is excreted unchanged in the urine. Urinary excretion is affected by urinary perfusion and factors affecting urinary pH. Acidifying the urine hastens the renal elimination of local anesthetics. Various pharmacokinetic parameters of the local anesthetics can be significantly altered by the presence of renal disease, factors affecting urinary pH, and renal blood flow. Specific Populations Hepatic Impairment Because amide-type local anesthetics, such as bupivacaine, are metabolized by the liver, the effects of decreased hepatic function on bupivacaine pharmacokinetics following administration of bupivacaine liposome injectable suspension were studied in patients with moderate hepatic impairment. Consistent with the hepatic clearance of bupivacaine, mean plasma concentrations were higher in patients with moderate hepatic impairment than in the healthy control volunteers with approximately 1.5- and 1.6-fold increases in the mean values for C max and the area under the curve (AUC), respectively. [ See Warnings and Precautions ( 5.1 ) and Use in Specific Populations ( 8.6 ) ].