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A 33-year-old member asked:

Long term side effects of phenergan (promethazine)?

1 doctor answer2 doctors weighed in
Dr. Joseph Woods
Pathology 30 years experience
Seizures, rare.: Rare side effects include seizures, and neuroleptic malignant syndrome, a life-threatening neurological disorder. This consists of muscle rigidity, fever, autonomic instability, and cognitive changes such as delirium, and is associated with elevated plasma creatine phosphokinase.
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Last updated Jul 12, 2020
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