Boehringer Ingelheim Synanthic Bovine Dewormer Suspension 22.5%Synanthic Bovine Dewormer Suspension 22. 5% is a broad spectrum cattle dewormer for removal and control of lungworms, barberpole worms, stomach worms, nodular worms, hookworms, tapeworms, and roundworms, including inhibited Ostertagia. Synanthic dewormer contains 225 mg of oxfendazole per ml. Give cattle 1 ml per 110 lbs. of body weight orally. Treatment may be repeated in 4 to 6 weeks. Synanthic cattle dewormer suspension 22. 5% is not for use in