 By the 1990s, Obetrol Pharmaceuticals had been wholly absorbed by Rexar Pharmacal and was no longer noted as a "division" of Rexar.In 1993, Rexar was acquired by Richwood Pharmaceuticals of Florence, Kentucky, which in 1995 merged with Shire Pharmaceuticals.Per the 1972 "Physicians' Desk Reference", Obetrol contained (per 10 mg tablet)