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HOME >> API >> API List 2 >> Isradipine >> Interaction

INTERACTION
Isradipine CAS Registry Number 75695-93-1

 Drug interactions (not inclusive)

* Grapefruit juice with certain dihydropyridines
* All medications that can lower blood pressure
* Fentanyl has been reported to cause severe hypotension when given with certain calcium channel blockers
* This reaction may occur with all calcium channel blockers, but no data available
* H2-receptor antagonists may increase the bioavailability of many of the dihydropyridine calcium channel blockers

(isradipine) has been safely coadministered with nitroglycerin.

Hydrochlorothiazide: A study in normal healthy volunteers has shown that concomitant administration of DynaCirc® (isradipine) and hydrochlorothiazide does not result in altered pharmacoktnetics of either drug. In a study in hypertensive patients, addition of isradipine to existing hydrochlorothiazide therapy did not result in any unexpected adverse effects, and isradipine had an additional antihypertensive effect.

Propranolol: In a single dose study in normal volunteers, coadministration of propranolol had a small effect on the rate but no effect on the extent of isradipine bioavailability. Significant increases In AUC (27%) and Cmax (58%) and decreases in tmax (23%) of propranolol were noted in this study. However, concomitant administration of 5 mg b.i.d. isradipine and 40 mg b.i.d. propranolol to healthy volunteers under steady-state conditions had no relevant effect on either drug's bioavailability, AUC and Cmax, differences were <20% between isradipine given singly and in combination with propranolol, and between propranolol given singly and in combination with isradipine.
Rifampicin: In a study in healthy volunteers, a six-day course of rifampicin at 600 mg/day followed by a single 5 mg dose of isradipine resulted in a reduction in isradipine levels to below detectable limits. If rifampicin therapy is required, isradipine concentrations and therapeutic effects are likely to be markedly reduced or abolished as a consequence of increased metabolism and higher clearance of isradipine. Warfarin: In a study in healthy volunteers, no clinically relevant pharmacokinetic or pharmacodynamic interaction between isradipine and racemic warfarin was seen when two single oral doses of warfarin (0.7 mg/kg body weight) were administered during 11 days of multipledose treatment with 5 mg b.i.d. isradipine. Neither racemic warfarin nor isradipine binding to plasma proteins in vitro was altered by the addition of the other drug.

Information Associated with Product:
DRUG DESCRIPTION DOSAGE SIDE EFFECTS PRECAUTIONS INTERACTION >> CONSUMER INFORMATION
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