plasma ampicillin concentrations were determined in an eight-ways crossover trial involving six ruminant calves , which were treated intravenously ( i.v . ) with sodium ampicillin at 15.5 mg/kg and intramuscularly ( i.m . ) with five different ampicillin trihydrate or ampicillin anhydrate formulations at 7.7 mg/kg .
C0700443
ampicillin trihydrate
C0002680
ampicillin