| Abbreviation | Definition |
|---|---|
| ARB | Angiotensin receptor blocker (antagonist) |
| ARB(s) | angiotensin-receptor blocker(s) |
| ARO | Antibiotic Resistant Organisms |
| ART | Anti Retrieval Therapy |
| ART | Anti Retro viral Therapy |
| AS | Atropine Sulphate |
| AVA | Anthrax Vaccine Adsorbed |
| AWMSG | All Wales Medicines Strategy Group |
| AZT | Azidothymidine |
| B&A | Before and After |
| BD | Bis In Die (Twice Daily) |
| BD&A | Before, During, and After |
| BID | Twice A Day |
| BIS | Twice |
| BNFC | British National Formulary for Children |
| BOL | BOLus (as a large single dose) |
| BOZ | Bismuth oxide and zinc cream |
| BP | British Pharmacopoeia |
| BPA | bisphenol A |
| BPC | British Pharmaceutical Codex |