MAJOR — Use With Caution
FDA-documented interaction. Clozapine dose reduction of approximately 50% typically needed when strong CYP1A2 inhibitor is added. Monitor clozapine levels.
Evidence level: STRONG
Ciprofloxacin (Cipro) can dramatically increase clozapine levels in your blood, potentially causing serious side effects including seizures, dangerous sedation, and cardiovascular problems.
Ciprofloxacin is a strong CYP1A2 inhibitor. Clozapine is primarily metabolized by CYP1A2. Ciprofloxacin can increase clozapine levels 2-3 fold, causing serious toxicity. FDA clozapine label warns about CYP1A2 inhibitors.
Tell your psychiatrist immediately if you are prescribed ciprofloxacin. Your clozapine dose will likely need to be cut in half. Use an alternative antibiotic if possible.
Follow each medication's specific timing instructions. Ciprofloxacin — check if it requires an empty stomach or should be taken with food. Clozapine 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).
Extreme drowsiness, confusion, seizures, rapid heartbeat, low blood pressure, drooling, difficulty breathing, fever
Reduce clozapine dose by ~50% when starting ciprofloxacin. Monitor clozapine levels. Use non-CYP1A2 inhibiting antibiotics (amoxicillin, cephalosporins) if possible. Readjust dose when antibiotic 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.
Ciprofloxacin (Cipro) can dramatically increase clozapine levels in your blood, potentially causing serious side effects including seizures, dangerous sedation, and cardiovascular problems.
Follow each medication's specific timing instructions. Ciprofloxacin — check if it requires an empty stomach or should be taken with food. Clozapine follows its normal schedule. Complete the full antibiotic course as prescribed.
Extreme drowsiness, confusion, seizures, rapid heartbeat, low blood pressure, drooling, difficulty breathing, fever
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.
Reduce clozapine dose by ~50% when starting ciprofloxacin. Monitor clozapine levels. Use non-CYP1A2 inhibiting antibiotics (amoxicillin, cephalosporins) if possible. Readjust dose when antibiotic stops.
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