Primary Open-Angle Glaucoma (POAG) Spectrum Practice Test

BID means dosing twice daily. This comes from the Latin bis in die, two times in one day, usually spaced about 12 hours apart to keep drug levels more consistent over 24 hours. It’s different from once daily (QD), three times daily (TID), or four times daily (QID), which would each be written with their respective abbreviations. So when a prescription says BID, plan for two doses in one day.