Bismuth subnitrate is widely used in the medical field, particularly in the treatment of gastrointestinal disorders. It acts as an antacid and a protective agent, coating the stomach lining to reduce irritation and inflammation. This makes it effective in managing conditions like gastritis, peptic ulcers, and acid reflux. Additionally, it exhibits mild antimicrobial properties, which can help in controlling infections in the digestive tract.

In dermatology, it is utilized in topical formulations for its astringent and soothing effects, aiding in the treatment of minor skin irritations, wounds, and eczema. Its ability to promote healing and reduce inflammation makes it a valuable component in various ointments and creams.

Bismuth subnitrate also finds application in cosmetic products, where it is used as a pigment or opacifying agent, providing a smooth and matte finish in makeup formulations like powders and foundations. Its non-toxic nature and skin-friendly properties make it a preferred choice in this industry.

Furthermore, it is employed in certain veterinary medicines to treat similar gastrointestinal issues in animals, ensuring their digestive health and comfort. Its versatility and effectiveness across multiple fields highlight its importance in both human and animal healthcare.