PO: by mouth
PR: rectally
SQ or SubQ: subcutaneous
IV: intravenous
IM: intramuscular
SL: sublingual
TD: transdermal
TOP: topical
Q: every
QD: every day
QOD: every other day
BID: twice daily
TID: three times daily
QID: four times daily
QxH (Q6H): every x hours
QHS: at bedtime (every hour of sleep)
PRN: as needed
AD LIB: as desired
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