What are the side effects of promethazine?

Based on information from, a free medication monitoring service, 44% of patients experience side effects while taking Promethazine (Phenergan). Some of the side effects reported by iGuard members include:

  • Drowsiness
  • Nausea/Vomiting
  • Dryness
  • Anxiety
  • Fatigue
  • Dizziness
  • Increased Appetite
Please follow up with your doctor or other healthcare provider if you are experiencing any symptoms that worsen or do not go away.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.