Every medication has side effects; however, it is rare that they may occur. Drug manufacturers are required to list all known side effects of their products. Patients can usually find the complete list of side effects with their medication. When side effects of necessary medication are severe, sometimes a second medication, lifestyle change, dietary change, or other measure may help to minimize them. Some common side effects of DIOVAN are: dizziness, headache, excessive tiredness, diarrhea or constipation, anxiety, insomnia, runny or stuffed nose, sore throat, stomach pain, back and joint pain, impotence, a loss of interest in sexual activity or difficulty having an orgasm chest pain, fast or pounding heartbeat, numbness or a tingling sensation, swelling, weight gain, breakdown of skeletal muscle tissue, eventually leading to kidney failure, muscle tenderness or weakness, especially in conjunction with fever, nausea or vomiting, dark colored urine