Final answer:
Antacids, H2RAs, and PPIs are used to treat ulcers, GERD, and conditions where the stomach produces too much acid. Antacids neutralize excess stomach acid, while H2RAs and PPIs reduce the production of stomach acid.
Step-by-step explanation:
Antacids are substances used to neutralize excess stomach acid and relieve symptoms of ulcers, such as heartburn and indigestion. They do not kill the bacteria H. pylori, which causes most ulcers. H2RAs (Hâ‚‚-receptor antagonists) like ranitidine and famotidine reduce the amount of acid made in the stomach and are used to treat ulcers, GERD, and conditions where the stomach produces too much acid. PPIs (proton pump inhibitors) like omeprazole also decrease the amount of acid made in the stomach and are used to treat the same conditions as H2RAs.