RE: Vermox Mebendazole and postpartum depression Kurzel RB, Toot PJ, Lambert LV, & Mihelcic AS New Zealand Medical Journal 107:439 October 1994 Plasma levels of mebendazole were below 20 ng/ml, and milk levels were below this (undetectable), in agreement with other reports. Therefore, the oral dose to the baby is of the order of 1 ng/ml, and the baby probably has a similarly low GI absorption. Recommendations to withhold breastfeeding are therefore questionable considering the exposure level.