MAJOR — Use With Caution
FDA-documented CYP3A4 interaction. Amlodipine efficacy reduced. May need alternative antihypertensive or higher doses with monitoring.
Evidence level: STRONG
Rifampin can make amlodipine (Norvasc) significantly less effective for blood pressure control by speeding up its breakdown. Your blood pressure may rise.
Rifampin induces CYP3A4. Amlodipine is metabolized by CYP3A4. Rifampin can significantly reduce amlodipine levels and efficacy. FDA labels document CYP3A4 interaction.
Monitor your blood pressure more frequently if starting rifampin. Your doctor may need to increase your amlodipine dose or add another blood pressure medication.
Follow each medication's specific timing instructions. Rifampin — check if it requires an empty stomach or should be taken with food. Amlodipine follows its normal schedule. Complete the full antibiotic course as prescribed.
Higher risk for: those with liver or renal impairment, elderly, concurrent use of nephrotoxic or hepatotoxic drugs, history of C. difficile infection, or those on narrow therapeutic index medications (warfarin, digoxin).
Rising blood pressure, headache, swelling in ankles
Monitor blood pressure. Increase amlodipine dose or add alternative antihypertensive. Readjust when rifampin stops.
Antibiotic interactions are often temporary (duration of treatment). Space supplements and probiotics 2-3 hours away from antibiotic doses. Ask your pharmacist if timing adjustments can reduce the interaction risk.
Rifampin can make amlodipine (Norvasc) significantly less effective for blood pressure control by speeding up its breakdown. Your blood pressure may rise.
Follow each medication's specific timing instructions. Rifampin — check if it requires an empty stomach or should be taken with food. Amlodipine follows its normal schedule. Complete the full antibiotic course as prescribed.
Rising blood pressure, headache, swelling in ankles
Antibiotic interactions are often temporary (duration of treatment). Space supplements and probiotics 2-3 hours away from antibiotic doses. Ask your pharmacist if timing adjustments can reduce the interaction risk.
Monitor blood pressure. Increase amlodipine dose or add alternative antihypertensive. Readjust when rifampin stops.
Or browse the full interaction database (121,000+ pairs).