bid means "twice a day"......it's used when writing a prescription or orders, on a chart, for a patient.

here are the examples that are used:



ac before meals

bid twice a day

cap capsule

gt drop

hs at bedtime

od right eye

os left eye

po by mouth

pc after meals

pil pill

prn as needed

q2h every 2 hours

qd every day

qh every hour

qid 4 times a day

tab tablet

tid 3 times a day

they are derived from latin.....xoxoxo pat