| Abbreviation | Definition |
|---|---|
| ISASS(OC) | International Scientific Activities and Standards Staff (OC) |
| ISB(CDRH) | Inspection Support Branch (CDRH) |
| ISBT | International Society of Blood Transfusion |
| ISBT128 | International Society of Blood Transfusion standard for blood, tissue, and organ identification |
| ISDN | Integrated Services Digital Network |
| ISE | Integrated Summary of Efficiency |
| ISIS | Import Support and Information System |
| ISMP | Institute for Safe Medication Practices |
| ISP | Internet Service Provider |
| ISPE | International Society for Pharmaceutical Engineering |
| ISPE | International Society for PharmacoEpidemiology |
| ISR | Individual Safety Report |
| ISS | Integrated Summary of Safety |
| ISS/ISE | Integrated Summary of Safety / Integrated Summary of Effectiveness |
| IT | information technology |
| ITACS | Import Trade Auxiliary Communication System |
| ITATMT | Information Technology Asset Tracking and Management Team |
| ITATMT(OC) | IT Asset Tracking and Management Team (OC) |
| ITB(CFSAN) | Immunotoxicology Branch (CFSAN) |
| ITCB(OC) | Information Technology Contracts Branch (OC) |