Absorption: Well absorbed following oral administration but extensively metabolized, resulting in ↓ bioavailability.
Distribution: Crosses the blood-brain barrier; remainder of distribution unknown.
Protein Binding: >95%.
Metabolism/Excretion: Mostly metabolized by the liver; 10% excreted unchanged by kidneys.
Half-life: 12 hr.
Contraindicated in:
Use Cautiously in:
CV: ARRHYTHMIAS, HF, chest pain, hypotension, palpitations, peripheral edema, syncope, tachycardia.
Derm: STEVENS-JOHNSON SYNDROME, dermatitis, erythema multiforme, flushing, ↑ sweating, photosensitivity, pruritus/urticaria, rash.
EENT: blurred vision, disturbed equilibrium, epistaxis, tinnitus.
Endo: gynecomastia, hyperglycemia.
GI: ↑liver enzymes, anorexia, constipation, diarrhea, dry mouth, dyspepsia, nausea, vomiting.
GU: dysuria, nocturia, polyuria, sexual dysfunction, urinary frequency.
Hemat: anemia, leukopenia, thrombocytopenia.
Metab: weight gain.
MS: joint stiffness, muscle cramps.
Neuro: abnormal dreams, anxiety, confusion, dizziness, drowsiness, dysgeusia, headache, nervousness, psychiatric disturbances, weakness., paresthesia, tremor.
Resp: cough, dyspnea.
Misc: gingival hyperplasia.
Drug-Drug:
Drug-Natural Products:
Drug-Food:
Hepatic Impairment
Therapeutic Classification: subarachnoid hemorrhage therapy agents
Pharmacologic Classification: calcium channel blockers
NDC Code*