Stimulant laxative
Increases intestinal peristalsis by irritating the bowel lining; produces a quick bowel movement.
Saline laxative
Draws water into the intestines by osmosis; softens stool and increases motility for rapid evacuation.
Antiflatulant
Reduces gas bubbles in the GI tract to relieve bloating and discomfort; simethicone is the common example.
H2 antagonist
Blocks histamine at H2 receptors in the stomach to reduce acid secretion; used for GERD and ulcers.
Emetic
Induces vomiting by stimulating the vomiting center in the brain; rarely used now.
Antacid
Neutralizes existing stomach acid to relieve heartburn and indigestion.
Bulk-forming laxative
Adds fiber-like bulk and absorbs water to form softer, more regular stools; safest for long-term use.
Stool softener
Allows water and fats to penetrate stool to prevent straining; often used post-surgery or postpartum.
Proton pump inhibitor (PPI)
Blocks the final step of gastric acid production; stronger acid suppression than H2 blockers.
Antihelmintic
Treats parasitic worm infections by killing or paralyzing the worms.
Antidiarrheal
Slows intestinal motility or absorbs excess fluid to reduce diarrhea.