Medword Resources:
Time & Hour Abbreviations
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Time & Hour Abbreviations
Drug Administration Time Abbreviations
Abbreviation |
Derivation |
Meaning |
a.c. | ante cibos | before meals |
b.i.d. | bis in diem | twice a day |
h | hora | hour |
h.s. | hora somni | at bedtime |
o.m. | omni mane | each morning |
o.n. | omni nocte | each night |
p.c. | post cibos | after meals |
p.r.n. | pro re nata | when needed |
q.d. | quaque diem | every day (daily) |
q.2h., q.3h., q.4h. | | every 2,3, or 4 hours |
q.i.d., or 4. i.d. | quarter in diem | four times a day |
stat | statium | at once |
t.i.d. | ter in diem | three times a day |
Drug Administration Hours Abbreviations
Abbreviation: | Meaning: |
q.i.d. | 0800, 1200, 1600, 2000 hours (four times a day) |
q.2h | 0600, 0800, 1000, 1200, (every two hours) |
q.3h | 0900, 1200, 1500, 1800, (every three hours) |
q.4h | 0800, 1200, 1600, (every four hours) |
q.6h | 0600, 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.