Pregnancy: Losartan potassium is contraindicated in pregnant women. When used in pregnancy especially during the second and third trimesters, drug that acts directly on the renin-angiotensin system may harm fetus organ or cause death. When pregnancy is detected, Losartan potassium should be discontinued immediately.
Lactation: It is not known whether Losartan potassium is excreted in human milk. A decision should be made whether to discontinue nursing or discontinue the drug, taking into account for the importance of the drug to the mother.