| Abbreviations | Meaning | Derivation and Notes |
| aa | of each | ana (Greek) |
| ac | before meals | ante cibum (Latin) |
| AD | right ear | auns dextra (Latin) |
| AL | left ear | auns laeva (Latin) |
| am | morning | ante meridiem (Latin) |
| AS | left ear | auns sinistra (Latin) |
| au | both ears | aunis (Latin) |
| bid | twice a day | bis in die (Latin) |
| c | 100 | --- |
| c (with a line over it) | with | cum (Latin) |
| cap | capsule | --- |
| cc | cubic centimeter | 30 cc = 1 ounce |
| disp | dispense | dentur tales doses (Latin) |
| dtd# | give this number | dentur tales doses (Latin) |
| ea | each | --- |
| ext | for external use | --- |
| gtt | drops | guttae (Latin) |
| gt | drop | gutta (Latin) |
| h | hour | hora (Latin) |
| hs | at bedtime | hora sommi (Latin) |
| M ft | make | misce fiat (Latin) |
| mitt# | give this number | mitte (Latin) |
| ml | milliliter | 30 ml = 1 ounce (1 ml = 1 cc) |
| o | pint | octarius (Latin) |
| OD | right eye | ocuius dexter (Latin) |
| OL | left eye | ocuius laevus (Latin) |
| OS | left eye | ocuius sinister (Latin) |
| OU | each eye | ocuius uterque (Latin) |
| pc | after meals | post cibum (Latin) |
| pm | evening | post meridian (Latin) |
| po | by mouth | per os (Latin) |
| prn | as needed | pro re nata (Latin) |
| qd | once a day; every day | quaqua die (Latin) |
| quid | four times a day | quater in die (Latin) |
| qod | every other day | --- |
| s (with a line over it) | without | sine (Latin) |
| sig | label as follows | signa (Latin) |
| sl | under the tongue | sub lingua (Latin) |
| SOB | shortness of breath | --- |
| sol | solution | --- |
| ss | half unit | semis (Latin) |
| stat | at once | statim (Latin) |
| susp | suspension | --- |
| tab | tablet | --- |
| tid | three times a day | ter in die (Latin) |
| top | apply topically | --- |
| ung or ungt | ointment | unguentum (Latin) |
| UT | under the tongue | --- |
| ut dict or UD | as directed | ut dictim (Latin) |
| x | times | --- |