| Abbreviation | Definition |
|---|---|
| ACTIS | AIDS Clinical Trials Information Service |
| ACUS | Administrative Conference of the United States |
| ACWA | Administrative Careers With America |
| AD | Action Due |
| ADA | American Dental Association |
| ADA | Americans with Disabilities Act of 1990 |
| ADAA | Animal Drug Availability Act of 1996 |
| ADaM | Analysis Dataset Model |
| ADAM7 | Analysis Data Model |
| ADAMHA | Alcohol, Drug Abuse Mental Health Administration |
| ADAMHA | Alcohol, Drug Abuse & Mental Health Administration |
| ADAMHA | Alcohol, Drug Abuse, and Mental Health Administration (now SAMHSA) |
| ADCOM | ADvisory COMmittee |
| ADE | Adverse Drug Event |
| ADE/ADER | Adverse Drug Experience/Adverse Drug Experience Report |
| ADEC | Australian Drug Evaluation Committee |
| AdEERS | Adverse Event Expedited Reporting System |
| ADER | Adverse Drug Experience Report |
| ADH | Anti-Diuretic Hormone |
| ADI | Acceptable Daily Intake |