“…Loew et al (1985) stated that monophenylbutazone is five to six times less toxic than phenylbutazone, but it is less effective when given at the same dose. Pinto et al (2009) studied whether monophenylbutazone was associated or not with gastric ulcers in ponies in a two-step experiment conducted at the Universidade Federal de Viçosa (Brazil). The first step consisted of three groups of two healthy ponies each, treated with daily intravenous doses (3, 4.5 or 6 mg/kg bwt during 12 days) of the drug.…”