[1] While the company's primary focuses are skin and eye care products, they also produce cosmetics, food supplements, and over-the-counter medications.

[2][3] Rohto has two production plants in Japan and six across the US, UK, China, Vietnam, Hong Kong, and Indonesia.

Rohto entered the Vietnamese market in 1997 to serve the Asia Pacific region.

[4] Yasutami Yamada (山田 安民) founded "Japanese: 信天堂山田安民薬房, lit.

[2] ROHTO Pharmaceutical Co. is the largest company in Japan's OTC drugs market, commanding a 40% share in the eye-drop sector.