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medical terms
| prn | as needed. |
| qid | four times a day. |
| qd | everyday. |
| ac | before every meal |
| tid | three times a day |
| bid | two times a day |
| pc | after meals |
| qhs | at night |
| po | per os (by mouth) |
| iv | intravenous |
| sc | subcutaneous |
| pr | per rectum |
| cvl | central venous line |
| npo | nil per os (nothing by mouth ) |
| im | intramuscular |
| nos | not otherwise specified |