Diltiazem Side Effects, Upsides, Downsides & Tips

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Diltiazem Side Effects. Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking diltiazem:

  • Body aches or pain
  • congestion
  • cough
  • dryness or soreness of the throat
  • fever
  • hoarseness
  • runny nose
  • tender or swollen glands in the neck
  • trouble swallowing
  • voice changes
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