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Drug, prescription: A drug requiring a prescription, as opposed to an over-the-counter drug, which can be purchased without one. The word prescription comes from the Latin praescriptus compounded from prae, before + scribere, to write = to write before. Historically, a prescription was written before the drug was prepared andadministered.
A prescription has several parts. There are:
Seen on a prescription, b.i.d. means twice (two times) a day. It is an abbreviation for bis in die which in Latin means, not too surprisingly, twice a day. The abbreviation b.i.d. is sometimes written without a period either in lower-case letters as bid or in capital letters as BID. However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: