Many mothers need to take medicines during their pregnancy and almost all medicines pass into breast milk in small quantities. Most are generally considered safe for a mother to take but some medicines that must be avoided include lithium, cytotoxic agents, retinoids and radio-pharmaceuticals. Search or browse the list below for guidelines on taking individual medicines while breastfeeding. Always consult your doctor or healthcare specialist for medical advice in relation to drug use while pregnant or breastfeeding. By clicking Subscribe, I agree to the Drugs.