by Teri Robert, Lead Expert

b.i.d. is an abbreviation used in writing prescriptions or instructions for taking medications. It is from the Latin bis in die and means twice a day.

We sometimes see b.i.d. when discussing Migraine and headache medications.

You can read more about Migraine and headache medications in these sections of our site:

For more terms, see our Migraine and Headache Glossary.

Medical review by John Claude Krusz, PhD, MD.

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Last updated February 27, 2010.