How many hours apart is twice a day?
Last updated September 3, 2026.
Twice daily usually means morning and evening, about 10 to 12 hours apart, while labels saying every 12 hours mean it strictly, antibiotics being the classic strict case, since the drug must stay above the level that suppresses bacteria. An hour or two of drift on a morning-evening drug is fine; doubling up after a forgotten dose is not, so skip and resume instead. Anchor doses to meals or tooth-brushing, set alarms for strict-interval drugs, and ask the pharmacist which category yours is in.
What to do
- Anchor doses to breakfast and dinner.
- Treat every-12-hours labels as strict, especially antibiotics.
- Skip-and-resume a missed dose; never double.
- Ask the pharmacist how strict your specific drug is.
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