There is an extensive literature on the adverse effects of drugs that
inhibit gastric acid secretion. This study presents a critical examina
tion of interactions between antisecretory drugs and other compounds,
the frequency of serious adverse effects relating to various body syst
ems, the safety of antisecretory drugs in pregnancy, and longer-term s
afety data from postmarketing surveillance studies. While interactions
with some other drugs, alcohol, and certain carcinogens are of potent
ial concern, in practice clinically significant reactions appear to be
rare if they occur at all. A small number of major side-effects have
been documented, but they occur rarely, and postmarketing surveillance
has not detected other longer-term sequelae. Safety of these drugs in
pregnancy is not established, as data are so few. It is concluded tha
t antisecretory agents, by comparison with most other classes of drugs
, are remarkably well tolerated.