Diovan HCT Side Effects. Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking hydrochlorothiazide / valsartan:
- Cold or flu-like symptoms
- difficulty with swallowing
- sore throat
- tender or swollen lymph nodes in the neck
- unusual tiredness or weakness
- bloating or stomach pain
- blurred vision
- chills
- eye pain
- fainting