Respiratory system I think. I MAY BE WRONG.
Hope I helped!
The secretion of hydrochloric acid by the stomach plays an important role in protecting the body against pathogens ingested with food or water. A gastric fluid pH of 1 to 2 is deleterious to many microbial pathogens; however, the neutralization of gastric acid by antacids or the inhibition of acid secretion by various drugs may increase the risk of food- or waterborne illnesses. Peptic ulcer disease is often treated by decreasing or eliminating gastric acid secretion, and such treatment blocks the protective antibacterial action of gastric fluid.
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The Best Answer : False
Why, Cause Medicines are used to cure, treat, and Prevent Diseases,It is categorized as a medicine if the drugs that are being used is not related to Medical purposes. if it's used for medical purposes, even Opium is considered a medicine. HOPE THIS HAVS HELPED U IF NOT COMMENT IN THE COMMENT SECTION BELOWW↓↓ THANKS !