Side effects of Cozaar include stomach pain, diarrhea, muscle cramps, dizziness and headaches, explains RxList. Other side effects include nose and throat infections, chest pain and backache, states WebMD.
Cozaar, also called losartan, can cause severe injury or death of the fetus when taken during the last six months of pregnancy, according to MedlinePlus. Therefore, it should never be taken by a person who is pregnant or planning to get pregnant. Other common side effects include seizures, slurred speech, blurred vision, pale skin and nausea, states Mayo Clinic. Rare side effects include fast and irregular heartbeat, fainting, sweating, temporary blindness and swelling of the face, states Drugs.com.