What does “etoh qd & prn” stand for?

I see this printed on shirts and hats.

ETOH stands for Ethyl Alcohol, qd is “four times daily” and prn is “as needed”. These are shorthands for prescription dosing, and obviously a funny for a t-shirt

ETOH = Ethyl Alcohol
QD = Daily
PRN = As Needed

qd is everyday, prn is as needed. tid three times a day and qid four times a day. bid twice a day.

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