This article is from the Asthma FAQ, by Patricia Wrean and Marie Goldenberg firstname.lastname@example.org with numerous contributions by others.
CR - controlled release. This means that the drug has a
constant rate of release.
DR - delayed release. This generally refers to enteric-
coated tablets which are designed to release the drug
in the intestine where the pH is in the alkaline range.
ER - extended release. Dosage forms which are designed to
release the drug over an extended period of time, such
as implants which release the drug over a period of
months or years.
SA - sustained action. Used interchangeably with CR
(above), except that SA usually refers to the
pharmacologic action while CR refers to the drug
TD - time delayed. This is slightly different from DR in
that the drug release is designed to occur after a
certain period of time, such as pellets coated to a
certain thickness, multi-layered tablets, tablets
within a capsule, or double-compressed tablets.
Contributed by: Susan Graham email@example.com