Instructed patient about Losartan, it is used toTreat hypertension and reducing the risk of stroke in patients with hypertension and left ventricular hypertrophy. Possible SE/AR may include, Diarrhea, Muscle cramps, Dizziness, Insomnia, Nasal congestion. Losartan also may cause: A persistent cough, an increase serum potassium and Impotence.