Clindamycin use while Breastfeeding. Drugs containing Clindamycin: Cleocin, Benzaclin, Clindagel, Onexton, Duac, Cleocin T, Cleocin Vaginal, VeltinClindamycin has the potential to cause adverse effects on the breastfed infant's gastrointestinal flora. If oral or intravenous clindamycin is required...