Medword Resources:
Time & Hour Abbreviations

Time & Hour Abbreviations

Drug Administration Time Abbreviations

Abbreviation Derivation Meaning
a.c.ante cibosbefore meals
b.i.d.bis in diemtwice a day
h.s.hora somniat bedtime
o.m.omni maneeach morning
o.n.omni nocteeach night cibosafter meals re natawhen needed
q.d.quaque diemevery day (daily)
q.2h., q.3h., q.4h. every 2,3, or 4 hours
q.i.d., or 4. i.d.quarter in diemfour times a day
statstatiumat once
t.i.d.ter in diemthree times a day

Drug Administration Hours Abbreviations

q.i.d.0800, 1200, 1600, 2000 hours (four times a day)
q.2h0600, 0800, 1000, 1200, (every two hours)
q.3h0900, 1200, 1500, 1800, (every three hours)
q.4h0800, 1200, 1600, (every four hours)
q.6h0600, 1200, 1800, 2400, (every six hours)
b.i.d.1000, 1600 (twice a day)
t.i.d.1000, 1500, and 1800
a.c.(before meals) 1/2 hour for example: 0630, 1130, 1630
p.c.(after meals) for example: 0800, 1400, 1800

24-hour time should always be used in order to avoid misunderstandings.

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