Ivermectin by Generic Contains 1% ivermectin, 40% glycerol formal and propylene glycol q.s. ad 100%. Contains 1% ivermectin, 40% glycerol formal and propylene glycol q.s. ad 100%. Do not use on calves to be processed for veal. Meat withdrawal time for cattle is 35 days. Swine meat withdrawal is 18 days.