Generic Diovan medication side effects may include dizziness, lightheadedness, tiredness, blurred vision, fainting, decreased sexual ability, change in the amount of urine, signs of infection (e.g., fever, chills, persistent sore throat), stomach/abdominal pain, severe nausea, yellowing eyes or skin, dark urine, unusual fatigue, symptoms of an allergic reaction include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.