1. a.m. - Morning hours.
2. p.m. - Afternoon or evening hours.
3. H.S. - Hour of sleep (bedtime).
4. gm - Gram (unit of weight).
5. cc - Cubic centimeter (unit of volume).
6. D/C - Discontinue (stop) medication.
7. a.c. - Before eating.
8. /c - With (in combination with).
9. p.c. - After eating.
10. /s - Without (without something).
11. ml - Mililiter (unit of volume).
12. mcg - Micrograms (unit of weight).
13. I.U. - International unit (unit of measurement).
14. B.P. - Blood pressure.
15. q - Every (frequency of medication administration).
16. qd - Every day.
17. q.i.d. - Four times a day.