What does qid bid tid in drug dose mean?

Answer 1

They are directions indicating how many times per day the dose should be administered. It goes like this:

SID or QD = Once a day

BID = Twice a day

TID = Three times a day

QID = Four times a day

However, The Joint Commission which acredits hospitals and nursing homes has recommended that these abbreviations be discontinued because they lead to errors in dosing. Now, physicians must write out the words, "once a day," "twice a day" and so on.

Answer 2

qid four times daily

bid twice daily

tid three times daily

OS in left eye (oculo sinister)

sq subcutaneously

Oh and another one is QOD = Every Other Day :)

Answer 3

qid - 4 times daily

ud - as directed

od - right eye

ou - both eyes

os - left eye

sq - subcutaneous (for injectables)