Ohkusa Yakuhin

Ohkusa Yakuhin is a Japanese pharmaceutical company specializing in the development, manufacture, and sale of over-the-counter (OTC) medicines and traditional Kampo herbal remedies. Founded in 1931 and headquartered in Yokosuka, the company is best known for its gastrointestinal products, including the long-selling herbal laxative Ohkusa Gan. Their product portfolio focuses on digestive health, pain relief, and general wellness through a combination of traditional Japanese medicine and modern pharmaceutical standards. Ohkusa Yakuhin operates its own manufacturing facilities to ensure the quality of its botanical-based formulations.