In rare circumstances, losartan can cause a breakdown of skeletal muscle tissue that can lead to kidney failure. So contact your doctor immediately if you experience unexplained muscle pain, tenderness, or weakness, especially if you also experience unusual fatigue, fever, and dark urine.
Using this drug can easily cause dehydration. This can result in very low blood pressure, a serious electrolyte imbalance, or kidney failure. Call your doctor if you experience unusual sweating, vomiting, or diarrhea.
Find emergency medical attention if you suspect an allergic reaction, such as hives or swelling. Also contact your doctor immediately if you feel: lightheaded, painful or burning urination, symptoms of high potassium (nausea, weakness, tingling, chest pain, irregular pulse, loss of movement), and symptoms of kidney issues (little/no urination, rapid weight gain, painful/difficult urination, swelling in hands, feet, or ankles).
Other common side effects include dizziness, back pain, and cold symptoms. Please note this guide does not contain all possible side effects and drug interactions.