Pregnancy In clinical trials with pregnant women, systemic administration of clindamycin during second and third trimesters has not been associated with increased frequency of congenital abnormalities; there are no adequate studies in pregnant women during first trimester of pregnancy; clindamycin should be used during first trimester of pregnancy only if clearly needed Lactation Not known whether clindamycin is excreted in human milk following therapy; however, orally and parenterally administered clindamycin has been reported to appear in breast milk; clindamycin has potential to cause adverse effects on breastfed infant's gastrointestinal flora; if oral or intravenous clindamycin is required by a nursing...