Bismuth compounds (most commonly bismuth subsalicylate) are used to relieve diarrhea, nausea, indigestion, heartburn and upset stomach by coating the gut and reducing inflammation. They also have mild antibacterial effects and are used in combination therapy to help eradicate Helicobacter pylori and treat peptic ulcers. Bismuth salts appear in some topical and minor wound products for local antiseptic and odor-control purposes.

In the stomach, bismuth compounds coat and protect irritated mucosa and ulcers, creating a protective barrier. They have mild antimicrobial and anti‑adhesive activity against H. pylori, reduce inflammation and secretions, and can bind bacterial toxins — helping relieve dyspepsia and diarrhoea. Bismuth is often used with antibiotics to improve H. pylori eradication.

Bismuth is an element, but in medicine it’s often encountered as bismuth subsalicylate — the active compound in some over-the-counter stomach remedies used for indigestion, nausea, heartburn and diarrhea. Other pharmaceutical forms include colloidal bismuth subcitrate; these bismuth compounds act locally in the gut rather than being absorbed systemically. They are generally considered safe when used as directed.

Bismuth compounds (e.g., bismuth subsalicylate) are used with antibiotics and a proton‑pump inhibitor as part of quadruple therapy to eradicate Helicobacter pylori. Bismuth has direct antibacterial effects, disrupts bacterial cell walls and biofilms, and protects gastric mucosa, boosting antibiotic efficacy. Common effects include black stool or tongue; avoid prolonged use in severe renal impairment and follow prescribed regimens.

Bismuth compounds (such as bismuth subsalicylate) are generally safe short-term at recommended doses for adults for stomach upset, diarrhea, or as part of H. pylori therapy. They can cause harmless black tongue or black stool. Avoid prolonged high doses and use caution with kidney impairment, pregnancy, breastfeeding, or in children/teens with viral illness. Follow label directions and consult your clinician.

Bismuth is a naturally occurring element in the Earth’s crust, typically found in minerals such as bismuthinite (Bi2S3) and bismite (Bi2O3). It commonly occurs in hydrothermal veins, pegmatites, and as an accessory element in lead, tin, tungsten, silver, and copper ores. Commercial bismuth is usually recovered as a byproduct of mining and refining these other metals; it is relatively scarce.