Diphenhydramine Side Effects, How it Works, Upsides & Downsides

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Diphenhydramine Side Effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

  • Dizziness;
  • drowsiness;
  • dry mouth, throat, and nose;
  • excitability;
  • thickening of mucus in nose or throat.
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