Similar to n.b.

ADA - Americans with Disabilities Act of 1990
ADAA - Animal Drug Availability Act of 1996
ADaM - Analysis Dataset Model
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

View all in FDA