CCBs with strong CYP3A4 inducers, such as phenytoin, carbamazepine, St John's wort, phenobarbital, rifampin, and rifabutin, significantly reduce nifedipine efficacy. Other contraindications include cardiogenic shock and sensitivity to CCBs.
Learn more about nifedipine warnings.
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Cite this: Mary L. Windle. Rapid Rx Quiz: Calcium Channel Blockers - Medscape - Oct 17, 2022.