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Promethazine HCl
Average User Rating:
Promethazine HCl, 2.80 / 5 (5 votes)

Promethazine HCl Side Effects

Three Promethazine tablets.

Severe side effects of Promethazine HCI

  • Respiratory Failure, with increased risk for pediatric and geriatric patients
  • Drastic change in blood pressure
  • Irregular Heartbeat
  • Neuroleptic Malignant Syndrome, which may be fatal if not treated immediately.

Common side effects of Promethazine HCI

  • Gastrointestinal side effects such as constipation, nausea, and vomiting.
  • Restlessness (especially during withdrawal), short temper, and other mood problems may occur.
  • Chest Pressure
  • Feelings of elevated euphoria, especially when taken in combination with opioids.