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What does qid bid tid in drug dose mean?

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Wiki User
2010-02-01 15:41:26

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.


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