Can you take antacids with antibiotics?
Last updated September 3, 2026.
Some antibiotics, not at the same time: antacid metals (aluminum, magnesium, calcium) bind quinolones like ciprofloxacin and tetracyclines like doxycycline into complexes your gut cannot absorb - the NHS's ciprofloxacin rule is a gap of at least 2 hours. The fix is spacing, not avoidance: antibiotic first, antacids (and iron, calcium, magnesium supplements) at least 2 hours away. Antibiotics that do not care: amoxicillin, azithromycin, cephalexin, nitrofurantoin, co-trimoxazole. Chronic heartburn? Ask about a scheduled acid controller timed away from doses instead of chasing with chews - and always flag your antacid habit when an antibiotic is prescribed. Pymander is a free AI doctor, 24/7 by text, and can help you build the schedule.
What to do
- Quinolones and tetracyclines: 2-hour gap minimum: antibiotic first.
- Supplements count too: iron, calcium, magnesium bind the same way.
- Amoxicillin, azithromycin, cephalexin: no problem: take normally.
- Tell the pharmacist about your antacid habit: they print the schedule.
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