Cardene Drug Information

• CARDENE I.V. is a calcium channel blocker indicated for the short-term treatment of hypertension in adults when oral therapy is not feasible. ( 1.1 ) 1.1 Hypertension CARDENE I.V. (nicardipine hydrochloride) is indicated in adults for the short-term treatment of hypertension when oral therapy is not feasible or not desirable. For prolonged control of blood pressure, transfer patients to oral medication as soon as their clinical condition permits [see Dosage and Administration (2.1) ].

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 to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The adverse reaction information from clinical trials does, however, provide a basis for identifying the adverse events that appear to be related to drug use and for approximating rates. Two hundred forty-four patients participated in two multicenter, double-blind, placebo-controlled trials of CARDENE I.V. Adverse experiences were generally not serious and most were expected consequences of vasodilation.

Adverse experiences occasionally required dosage adjustment. Therapy was discontinued in approximately 12% of patients, mainly due to hypotension, headache, and tachycardia. The table below shows percentage of patients with adverse events where the rate is >3% more common on CARDENE I.V. than placebo.

Adverse Event Cardene I.V. (N=144) Placebo (N=100) Body as a Whole Headache, n (%) 21 2 Cardiovascular Hypotension, n (%) 8 1 Tachycardia, n (%) 5 0 Digestive Nausea/vomiting, n (%) 7 1 Other adverse events have been reported in clinical trials or in the literature in association with the use of intravenously administered nicardipine: Body as a Whole : fever, neck pain Cardiovascular : angina pectoris, atrioventricular block, ST segment depression, inverted T wave, deep-vein thrombophlebitis Digestive : dyspepsia Hemic and Lymphatic : thrombocytopenia Metabolic and Nutritional : hypophosphatemia, peripheral edema Nervous : confusion, hypertonia Respiratory : respiratory disorder Special Senses : conjunctivitis, ear disorder, tinnitus Urogenital : urinary frequency Sinus node dysfunction and myocardial infarction, which may be due to disease progression, have been seen in patients on chronic therapy with orally administered nicardipine.

Postmarketing Experience

Because adverse reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate reliably their frequency or to establish a causal relationship to drug exposure. The following adverse reaction has been identified during post-approval use of CARDENE I.V.: decreased oxygen saturation (possible pulmonary shunting).

• Cimetidine increases oral nicardipine plasma levels. ( 7.2 )
• Oral or intravenous nicardipine may increase cyclosporine and tacrolimus plasma levels. Frequent monitoring of trough blood levels of cyclosporine and tacrolimus is recommended when co-administering CARDENE I.V. ( 7.3 , 7.4 ) 7.1 Beta-Blockers In most patients, CARDENE I.V. can safely be used concomitantly with beta blockers. However, titrate slowly when using CARDENE I.V. in combination with a beta-blocker in heart failure patients [see Warnings and Precautions (5.2) ]. 7.2 Cimetidine Cimetidine has been shown to increase nicardipine plasma concentrations with oral nicardipine administration. Frequently monitor response in patients receiving both drugs. Data with other histamine-2 antagonists are not available. 7.3 Cyclosporine Concomitant administration of oral or intravenous nicardipine and cyclosporine results in elevated plasma cyclosporine levels through nicardipine inhibition of hepatic microsomal enzymes, including CYP3A4. Closely monitor plasma concentrations of cyclosporine during CARDENE I.V. administration, and reduce the dose of cyclosporine accordingly. 7.4 Tacrolimus Concomitant administration of intravenous nicardipine and tacrolimus may result in elevated plasma tacrolimus levels through nicardipine inhibition of hepatic microsomal enzymes, including CYP3A4. Closely monitor plasma concentrations of tacrolimus during CARDENE I.V. administration, and adjust the dose of tacrolimus accordingly. 7.5 In Vitro Interaction The plasma protein binding of nicardipine was not altered when therapeutic concentrations of furosemide, propranolol, dipyridamole, warfarin, quinidine, or naproxen were added to human plasma in vitro.

Pregnancy Risk Summary Available data from published literature (clinical trials and case series) over decades of use of intravenous nicardipine during pregnancy have not identified a drug-associated risk of major birth defects or miscarriage. However, nicardipine is predominantly used in pregnancy after 20 gestational weeks. Use of nicardipine in women with preeclampsia or pre-term labor is associated with maternal and fetal/neonatal adverse events.

Maternal adverse events included pulmonary edema, dyspnea, hypoxia, hypotension, reflex tachycardia, postpartum hemorrhage, tocolysis, headache, nausea, dizziness, flushing, and phlebitis at site of injection. Fetal/neonatal adverse events included transient fetal heart rate decelerations, hypotension and acidosis (pH<7.25) (see Clinical Considerations). In animal reproductive and developmental toxicity studies in which nicardipine was administered intravenously to pregnant rats and rabbits during organogenesis, increased embryolethality, but no teratogenicity occurred at a dose 0.27 times and 0.05 times the maximum recommended human dose (MRHD) in rats and rabbits, respectively. No embryotoxicity occurred in offspring of pregnant rats administered oral doses of nicardipine 8 times the oral MRHD, but did occur in offspring of pregnant rabbits with oral doses at 24 times the oral MRHD (see Data). The background risk of major birth defects and miscarriage for the indicated population is unknown.

All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects is 2% to 4% and miscarriage is 15% to 20% of clinically recognized pregnancies. Clinical Considerations Disease-Associated Maternal and/or Embryo/Fetal Risk Hypertension in pregnancy increases the maternal risk for pre-eclampsia, gestational diabetes, premature delivery, and delivery complications (e.g., need for cesarean section, and post-partum hemorrhage). Hypertension increases the fetal risk for intrauterine growth restriction and stillbirth.

Pregnant women with hypertension should be carefully monitored and managed accordingly. Maternal Adverse Reactions Hypotension, reflex tachycardia, postpartum hemorrhage, tocolysis, headache, nausea, dizziness, and flushing have been reported in pregnant women who were treated with intravenous nicardipine for hypertension during pregnancy. Adverse events in women treated with intravenous nicardipine during pre-term labor include pulmonary edema, dyspnea, hypoxia, hypotension, tachycardia, headache, and phlebitis at site of injection.

Manage the patient accordingly. Fetal/Neonatal Adverse Reactions Nicardipine crosses the placenta. Transient fetal heart rate decelerations have been reported.

Hypotension and acidosis (pH<7.25) have also been reported in neonates. The relationship to the use of nicardipine is not clear. If fetal heart rate decelerations, or neonatal hypotension or acidosis occur, manage accordingly.

Data Animal Data In embryofetal toxicity studies, no embryotoxicity or teratogenicity was seen when nicardipine was administered intravenously to pregnant rats and rabbits during organogenesis at doses up to 0.14 times the MRHD based on body surface area (mg/m2) (5 mg/kg/day in rats) and 0.03 times the MRHD based on body surface area (mg/m2) (0.5 mg/kg/day in rabbits). Embryolethality, but no teratogenicity was seen at 0.27 times the MRHD based on body surface area (mg/m2) (10 mg/kg/day) in rats and at 0.05 times the MRHD based on body surface are (mg/m2) (1 mg/kg/day) in rabbits. In other animal studies, pregnant Japanese White rabbits received oral nicardipine during organogenesis, at doses 8 and 24 times the oral MRHD based on body surface area (mg/m2) (50 and 150 mg/kg/day). Embryolethality occurred at the high dose along with signs of maternal toxicity (marked maternal weight gain suppression). New Zealand albino rabbits received oral nicardipine during organogenesis, at doses up to 16 times the oral MRHD based on body surface area (mg/m2) (100 mg/kg/day). While significant maternal mortality occurred, no adverse effects on the fetus were observed. Pregnant rats received oral nicardipine from day 6 through day 15 of gestation at doses up to 8 times the oral MRHD based on body surface area (mg/m2) (100 mg/kg/day). There was no evidence of embryolethality or teratogenicity; however, dystocia, reduced birth weights, reduced neonatal survival, and reduced neonatal weight gain were noted.

Pediatric Use The safety and effectiveness of CARDENE I.V. have not been established in pediatric patients.

• Do not use in patients with advanced aortic stenosis ( 4.1 ). 4.1 Advanced Aortic Stenosis CARDENE I.V. is contraindicated in patients with advanced aortic stenosis because part of the effect of CARDENE I.V. is secondary to reduced afterload. Reduction of diastolic pressure in these patients may worsen rather than improve myocardial oxygen balance.

Several overdosages with orally administered nicardipine have been reported. One adult patient allegedly ingested 600 mg of immediate-release oral nicardipine, and another patient, 2160 mg of the sustained-release formulation of nicardipine. Symptoms included marked hypotension, bradycardia, palpitations, flushing, drowsiness, confusion and slurred speech.

All symptoms resolved without sequelae. An overdosage occurred in a one year old child who ingested half of the powder in a 30 mg nicardipine standard capsule. The child remained asymptomatic.

Based on results obtained in laboratory animals, lethal overdose may cause systemic hypotension, bradycardia (following initial tachycardia) and progressive atrioventricular conduction block. Reversible hepatic function abnormalities and sporadic focal hepatic necrosis were noted in some animal species receiving very large doses of nicardipine. For treatment of overdosage, implement standard measures including monitoring of cardiac and respiratory functions.

Position the patient so as to avoid cerebral anoxia. Use vasopressors for patients exhibiting profound hypotension.