Olmesartan original brand?

Benicar. It was the original brand name for olmesartan medoxomil in the United States (developed by Daiichi Sankyo). In Europe it’s also sold under the brand name Olmetec, and there are generic versions available as olmesartan medoxomil. Benicar HCT is the combination with hydrochlorothiazide. If you’re asking about a specific country, tell me and I can confirm that brand name there.