Cinacalcet Hydrochloride

1 INDICATIONS AND USAGE Cinacalcet tablets are a positive modulator of the calcium sensing receptor indicated for: Secondary Hyperparathyroidism (HPT) in adult patients with chronic kidney disease (CKD) on dialysis. (1.1) Limitations of Use: Cinacalcet tablets are not indicated for use in patients with CKD who are not on dialysis. Hypercalcemia in adult patients with Parathyroid Carcinoma (PC). (1.2) Hypercalcemia in adult patients with primary HPT for whom parathyroidectomy would be indicated on the basis of serum calcium levels, but who are unable to undergo parathyroidectomy. (1.3) 1.1 Secondary Hyperparathyroidism Cinacalcet tablets are indicated for the treatment of secondary hyperparathyroidism (HPT) in adult patients with chronic kidney disease (CKD) on dialysis [see Clinical Studies (14.1 )] . Limitations of Use: Cinacalcet tablets are not indicated for use in patients with CKD who are not on dialysis because of an increased risk of hypocalcemia [see Warnings and Precautions (5.1) ] . 1.2 Parathyroid Carcinoma Cinacalcet tablets are indicated for the treatment of hypercalcemia in adult patients with Parathyroid Carcinoma [see Clinical Studies (14.2) ] . 1.3 Primary Hyperparathyroidism Cinacalcet tablets are indicated for the treatment of hypercalcemia in adult patients with primary HPT for whom parathyroidectomy would be indicated on the basis of serum calcium levels, but who are unable to undergo parathyroidectomy [see Clinical Studies (14.3) ] .

2 DOSAGE AND ADMINISTRATION Cinacalcet tablets should be taken with food or shortly after a meal. (2.1) Tablets should always be taken whole and not divided. (2.1) Secondary HPT in patients with CKD on dialysis (2.2) : Starting dose is 30 mg once daily. Titrate dose no more frequently than every 2 to 4 weeks through sequential doses of 30 mg, 60 mg, 90 mg, 120 mg, and 180 mg once daily as necessary to achieve targeted intact parathyroid hormone (iPTH) levels. iPTH levels should be measured no earlier than 12 hours after most recent dose. Hypercalcemia in patients with PC or hypercalcemia in patients with primary HPT (2.3) : Starting dose is 30 mg twice daily. Titrate dose every 2 to 4 weeks through sequential doses of 30 mg twice daily, 60 mg twice daily, 90 mg twice daily, and 90 mg three or four times daily as necessary to normalize serum calcium levels. Once the maintenance dose has been established, monitor serum calcium approximately monthly for patients with secondary HPT and every 2 months for patients with PC or primary HPT. (2.5) 2.1 Administration Cinacalcet tablets should be taken with food or shortly after a meal. Cinacalcet tablets are administered orally and should always be taken whole and not chewed, crushed, or divided. 2.2 Secondary Hyperparathyroidism in Patients with Chronic Kidney Disease on Dialysis The recommended starting oral dose of cinacalcet tablets is 30 mg once daily. Serum calcium and serum phosphorus should be measured within 1 week and intact parathyroid hormone (iPTH) should be measured 1 to 4 weeks after initiation or dose adjustment of cinacalcet tablets [see Dosage and Administration (2.3) ] . Cinacalcet tablets should be titrated no more frequently than every 2 to 4 weeks through sequential doses of 30 mg, 60 mg, 90 mg, 120 mg, and 180 mg once daily to target iPTH levels of 150 to 300 pg/mL. Serum iPTH levels should be assessed no earlier than 12 hours after dosing with cinacalcet tablets. Cinacalcet tablets can be used alone or in combination with vitamin D sterols and/or phosphate binders. During dose titration, serum calcium levels should be monitored frequently and if levels decrease below the normal range, appropriate steps should be taken to increase serum calcium levels, such as by providing supplemental calcium, initiating or increasing the dose of calcium-based phosphate binder, initiating or increasing the dose of vitamin D sterols, or temporarily withholding treatment with cinacalcet tablets [see Dosage and Administration (2.3) and Warnings and Precautions (5.1) ] . 2.3 Patients with Parathyroid Carcinoma and Primary Hyperparathyroidism The recommended starting oral dose of cinacalcet tablets is 30 mg twice daily. The dose of cinacalcet tablets should be titrated every 2 to 4 weeks through sequential doses of 30 mg twice daily, 60 mg twice daily, and 90 mg twice daily, and 90 mg 3 or 4 times daily as necessary to normalize serum calcium levels. Serum calcium should be measured within 1 week after initiation or dose adjustment of cinacalcet tablets [see Dosage and Administration (2.5) and Warnings and Precautions (5.1) ] . 2.4 Switching from Parsabiv (etelcalcetide) to Cinacalcet Tablets Discontinue etelcalcetide for at least 4 weeks prior to starting cinacalcet tablets. Ensure corrected serum calcium is at or above the lower limit of normal prior to cinacalcet tablets initiation [see Warnings and Precautions (5.1)] . Initiate cinacalcet tablets treatment at a starting dose of 30 mg once daily. 2.5 Monitoring for Hypocalcemia Once the maintenance dose has been established, serum calcium should be measured approximately monthly for patients with secondary hyperparathyroidism with CKD on dialysis, and every 2 months for patients with parathyroid carcinoma or primary hyperparathyroidism [see Dosage and Administration (2.2 , 2.3) ] . For secondary hyperparathyroidism patients with CKD on dialysis, if serum calcium falls below 8.4 mg/dL but remains above 7.5 mg/dL, or if symptoms of h …

3 DOSAGE FORMS AND STRENGTHS 30 mg tablets (green color, coated, oval-shaped tablets, debossed with “155” on one side and plain on the other side) 60 mg tablets (green color, coated, oval-shaped tablets, debossed with “157” on one side and plain on the other side) 90 mg tablets (green color, coated, oval-shaped tablets, debossed with “213” on one side and plain on the other side) Tablets: 30 mg, 60 mg, and 90 mg tablets (3)

4 CONTRAINDICATIONS Cinacalcet HCl treatment initiation is contraindicated if serum calcium is less than the lower limit of the normal range [see Warnings and Precautions (5.1) ] . Cinacalcet hydrochloride treatment initiation is contraindicated if serum calcium is less than the lower limit of the normal range. (4, 5.1)

6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of labeling: Hypocalcemia [see Warnings and Precautions (5.1) ] Upper Gastrointestinal Bleeding [see Warnings and Precautions (5.2) ] Hypotension, Worsening Heart Failure and/or Arrhythmias [see Warnings and Precautions (5.3) ] Adynamic Bone Disease [see Warnings and Precautions (5.4) ] The most common adverse reactions (i.e., ≥ 25%) associated with cinacalcet hydrochloride were nausea and vomiting. (6) To report SUSPECTED ADVERSE REACTIONS, contact Amneal Pharmaceuticals at 1-877-835-5472 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Trials 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 with rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. Secondary Hyperparathyroidism in Patients with Chronic Kidney Disease on Dialysis In three double-blind, placebo-controlled clinical trials, 1126 patients with CKD on dialysis received study drug (656 cinacalcet HCl, 470 placebo) for up to 6 months. The most frequently reported adverse reactions are listed in Table 1. Seizures were observed in 1.4% (13/910) of cinacalcet HCl-treated patients and 0.7% (5/641) of placebo-treated patients across all completed placebo-controlled trials. Table 1. Adverse Reactions with Frequency ≥ 5% in Patients on Dialysis in Short-Term Studies for up to 6 Months Placebo (n = 470) Cinacalcet HCl (n = 656) Event*: (%) (%) Nausea 19 31 Vomiting 15 27 Diarrhea 20 21 Myalgia 14 15 Dizziness 8 10 Hypertension 5 7 Asthenia 4 7 Anorexia 4 6 Pain Chest, Non-Cardiac 4 6 Dialysis Access Site Infection 4 5 *Included are events that were reported at a greater incidence in the cinacalcet HCl group than in the placebo group. In a randomized, double-blind placebo-controlled study of 3,883 patients with secondary HPT and CKD receiving dialysis in which patients were treated for up to 64 months (mean duration of treatment was 21 months in the cinacalcet HCl group), the most frequently reported adverse reactions (incidence of ≥ 5% in the Cinacalcet HCl group and a difference ≥ 1% compared to placebo) are listed in Table 2. Table 2. Frequency of Adverse Reactions in Dialysis Patients Treated for up to 64 Months in a Long-Term Study 1 Placebo (N=1923) Cinacalcet HCl (N=1938) 3,699 subject-years 4,044 subject-years Percent of subjects reporting Adverse Reactions (%) 90.9 93.2 Nausea 15.5 29.1 Vomiting 13.7 25.6 Diarrhea 18.7 20.5 Dyspnea 11.5 13.4 Cough 9.8 11.7 Hypotension 10.5 11.6 Headache 9.6 11.5 Hypocalcaemia 1.4 11.2 Muscle spasms 9.2 11.1 Abdominal pain 9.6 10.9 Abdominal pain upper 6.3 8.2 Hyperkalemia 6.1 8.1 Upper respiratory tract infection 6.3 7.6 Dyspepsia 4.6 7.4 Dizziness 4.7 7.3 Decreased appetite 3.5 5.9 Asthenia 3.8 5.4 Constipation 3.8 5 1 Adverse reactions that occurred in ≥ 5% Frequency in the cinacalcet HCl group and a difference ≥ 1% compared to the placebo group (Safety Analysis Set). Crude incidence rate = 100 * Total number of subjects with event/ N N=Number of subjects receiving at least one dose of study drug. Additional adverse reaction rates from the long-term, randomized, double-blind placebo-controlled study for cinacalcet HCl versus placebo are as follows: seizure (2.5%, 1.6%), rash (2.2%, 1.9%), hypersensitivity reactions (9.4%, 8.3%). Patients with Parathyroid Carcinoma and Primary Hyperparathyroidism The safety profile of cinacalcet HCl in these patient populations is generally consistent with that seen in patients with CKD on dialysis. Forty six patients were treated with cinacalcet HCl in a single-arm study, 29 with Parathyroid Carcinoma and 17 with intractable pHPT. Nine (20%) of the patients withdrew from the study due to adverse events. The most frequent adverse reactions and the most frequent cause of withdrawal in these patient populations …

7 DRUG INTERACTIONS Co-administration with a strong CYP3A4 inhibitor may increase serum levels of cinacalcet. Dose adjustment and monitoring of iPTH serum phosphorous and serum calcium may be required. (7.1) Cinacalcet is a strong inhibitor of CYP2D6. Dose adjustments may be required for concomitant medications that are predominantly metabolized by CYP2D6. (7.2) 7.1 Strong CYP3A4 Inhibitors Cinacalcet is partially metabolized by CYP3A4. Dose adjustment of cinacalcet HCl may be required if a patient initiates or discontinues therapy with a strong CYP3A4 inhibitor (e.g., ketoconazole, itraconazole). The iPTH and serum calcium concentrations should be closely monitored in these patients [see Clinical Pharmacology (12.3) ] . 7.2 CYP2D6 Substrates Cinacalcet is a strong inhibitor of CYP2D6. Dose adjustments may be required for concomitant medications that are predominantly metabolized by CYP2D6 (e.g., desipramine, metoprolol, and carvedilol) and particularly those with a narrow therapeutic index (e.g., flecainide and most tricyclic antidepressants) [see Clinical Pharmacology (12.3) ] .

8 USE IN SPECIFIC POPULATIONS Pediatric Use: A fatal outcome was reported in a pediatric clinical trial patient with severe hypocalcemia. Cinacalcet hydrochloride is not indicated for use in pediatric patients. ( 8.4 ). 8.1 Pregnancy Risk Summary Limited case reports of cinacalcet HCl use in pregnant women are insufficient to inform a drug associated risk of adverse developmental outcomes. In animal reproduction studies, when female rats were exposed to cinacalcet during the period of organogenesis through to weaning at 2 to 3 times the systemic drug levels (based on AUC) at the maximum recommended human dose (MRHD) of 180 mg/day, peripartum and early postnatal pup loss and reduced pup body weight gain were observed in the presence of maternal hypocalcemia [see Data] . The estimated background risk of major birth defects and miscarriage for the indicated populations is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Data Animal Data In pregnant female rats given oral gavage doses of 2, 25, 50 mg/kg/day cinacalcet during gestation, no teratogenicity was observed at doses up to 50 mg/kg/day (exposure 4 times those resulting with a human oral dose of 180 mg/day based on AUC comparison). Decreased fetal body weights were observed at all doses (less than 1 to 4 times a human oral dose of 180 mg/day based on AUC comparison) in conjunction with maternal toxicity (decreased food consumption and body weight gain). In pregnant female rabbits given oral gavage doses of 2, 12, 25 mg/kg/day cinacalcet during gestation, no adverse fetal effects were observed (exposures less than with a human oral dose of 180 mg/day based on AUC comparisons). Reductions in maternal food consumption and body weight gain were seen at doses of 12 and 25 mg/kg/day. Cinacalcet has been shown to cross the placental barrier in rabbits. In pregnant rats given oral gavage doses of 5, 15, 25 mg/kg/day cinacalcet during gestation through lactation, no adverse fetal or pup (post-weaning) effects were observed at 5 mg/kg/day (exposures less than with a human therapeutic dose of 180 mg/day based on AUC comparisons). Higher doses of 15 and 25 mg/kg/day cinacalcet (exposures 2 to 3 times a human oral dose of 180 mg/day based on AUC comparisons) were accompanied by maternal signs of hypocalcemia (periparturient mortality and early postnatal pup loss), and reductions in postnatal maternal and pup body weight gain. 8.2 Lactation Risk Summary There are no data regarding the presence of cinacalcet HCl in human milk or effects on the breastfed infant or on milk production. Studies in rats showed that cinacalcet was excreted in the milk. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for cinacalcet HCl and any potential adverse effects on the breastfed infant from cinacalcet HCl or from the underlying maternal condition. 8.4 Pediatric Use The safety and efficacy of cinacalcet HCl have not been established in pediatric patients. The use of cinacalcet HCl for the treatment of secondary HPT in pediatric patients with CKD on dialysis was evaluated in two randomized, controlled studies (Pediatric Study 1 and Study 2) where 47 pediatric patients aged 6 years to less than 18 years received at least one dose of cinacalcet HCl and in one single-arm study (Pediatric Study 3) where 17 pediatric patients aged 28 days to less than 6 years received at least one dose of cinacalcet HCl. Dosing with cinacalcet HCl in Pediatric Study 1 was stopped because of a fatality in a cinacalcet HCl-treated individual. The individual was noted to be severely hypocalcemic at the time of death. The cause of death was multifactorial and a contribution of cinacalcet HCl to the death could not be excluded [see Warnings and Precautions (5.1) ] . Study 1 was terminated and changes to cinacalcet HCl dosing after …

11 DESCRIPTION Cinacalcet tablets contain the hydrochloride salt of the active ingredient cinacalcet, a positive modulator of the calcium sensing receptor. The empirical formula for cinacalcet is C 22 H 22 F 3 N⋅HCl with a molecular weight of 393.9 g/mol (hydrochloride salt) and 357.4 g/mol (free base). It has one chiral center having an R-absolute configuration. The R-enantiomer is the more potent enantiomer and has been shown to be responsible for pharmacodynamic activity. The hydrochloride salt of cinacalcet is a white to off-white, crystalline solid that is soluble in methanol or 95% ethanol and slightly soluble in water. The hydrochloride salt of cinacalcet is described chemically as N-[1-(R)-(-)-(1-naphthyl)ethyl]-3-[3-(trifluoromethyl)phenyl]-1-aminopropane hydrochloride and has the following structural formula: Cinacalcet tablets are formulated as green color, film-coated, oval-shaped tablets for oral administration in strengths of 30 mg, 60 mg, and 90 mg of cinacalcet as the free base equivalent (33 mg, 66 mg, and 99 mg as the hydrochloride salt, respectively). Inactive Ingredients The following are the inactive ingredients in cinacalcet tablets: colloidal silicon dioxide, crospovidone, D&C Yellow #10 aluminum lake, FD&C Blue #2/Indigo carmine aluminum lake, hypromellose, magnesium stearate, mannitol, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, pregelatinized starch (corn), talc, and titanium dioxide. a7c316fa-figure-01

10 OVERDOSAGE Overdosage of Cinacalcet HCl may lead to hypocalcemia. In the event of overdosage, patients should be monitored for signs and symptoms of hypocalcemia and appropriate measures taken to correct serum calcium levels [see Warnings and Precautions (5.1) ] . Since cinacalcet HCl is highly protein bound, hemodialysis is not an effective treatment for overdosage of cinacalcet HCl.

16 HOW SUPPLIED/STORAGE AND HANDLING Cinacalcet tablets, 30 mg are formulated as green color, film-coated, oval-shaped tablets debossed with “155” on one side and plain on the other side. They are available as follows: Bottles of 30: NDC 65162-155-03 Bottles of 100: NDC 65162-155-10 Bottles of 250: NDC 65162-155-25 Cinacalcet tablets, 60 mg are formulated as green color, film-coated, oval-shaped tablets debossed with “157” on one side and plain on the other side. They are available as follows: Bottles of 30: NDC 65162-157-03 Bottles of 100: NDC 65162-157-10 Bottles of 250: NDC 65162-157-25 Cinacalcet tablets, 90 mg are formulated as green color, film-coated, oval-shaped tablets debossed with “213” on one side and plain on the other side. They are available as follows: Bottles of 30: NDC 65162-213-03 Bottles of 100: NDC 65162-213-10 Bottles of 250: NDC 65162-213-25 Storage Store at 20o to 25oC (68o to 77oF); excursions permitted between 15° to 30oC (59° to 86oF) [see USP Controlled Room Temperature].