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Doctor insights on: Promethazine Side Effects

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Long term side effects of phenergan (promethazine)?

Long term side effects of phenergan (promethazine)?

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. ...Read more

Dr. Syed H. Sajid
164 doctors shared insights

Promethazine (Definition)

Prevents and controls motion sickness, nausea, vomiting, and dizziness. Also used to relieve or prevent allergic reactions, helps people go to sleep, and control their pain or anxiety before or after ...Read more


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So what are side effects of promethazine hydrochloride pills?

So what are side effects of promethazine hydrochloride pills?

Multiple effects: Promethazine is a potent antihistamine that can cause dizziness, drowsiness, dry mouth, nausea, vomiting, weakness and occasionally more serious central nervous system side effects. It is usually well tolerated in most people. ...Read more

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Side effects of promethazine hydrochloride?

Side effects of promethazine hydrochloride?

Seizures.: Common side effects of this antihistamine include, tardive dyskinesia, confusion in the elderly, drowsiness, dizziness, fatigue, vertigo, respiratory depression, constipation, euphoria, and short temper/irritability. Rare side effects include seizures, and neuroleptic malignant syndrome, a life-threatening neurological disorder. Because of capacity for more severe side effects, avoid in elderly. ...Read more

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I am on the anti nausea drug promethazine. What are the common side effects?

I am on the anti nausea drug promethazine. What are the common side effects?

Numerous side effect: Serious side effects--twitching and uncontrollable movement, shaking, drooling, restlessness, agitated, high fever, stiff musles, lightheaded, seizures, hallucinations, abdominal pain, rash, joint pain, low heart rate. Less serious---dizzyness, blurred vision, dry mouth, ringing in ears, weight gain, constipation. ...Read more

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Promethazine/codeine syrup side effect?

Promethazine/codeine syrup side effect?

Usually None!: In normal dossage, the only remote side-effect would be constipation, maybe itching although rare. With overdose or with blunts or cigs dipped and smoked, hallucinogenic. ...Read more

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Can Flagyl cause hypertonicity & limbs/face numbness as side effect? Was also taking Percocet, benedryl, phenergan, (promethazine) synthroid, & klonopin w/no issue.

Can Flagyl cause hypertonicity & limbs/face numbness as side effect? Was also taking Percocet, benedryl, phenergan, (promethazine) synthroid, & klonopin w/no issue.

Rule out alcohol: Flagyl can cause a build up of a toxic substance if taken with alcohol. The alcohol can be consumed or can be assimilated by hand washes, mouth washes, etc. The toxic build up would be my first guess as to the reason for the side effects noted. With a pharmacist or online you can search for known side effects of flagyl (metronidazole). ...Read more