SIDE EFFECTS: If you notice any of the following unlikely but very serious side effects, seek immediate medical attention: severe muscle stiffness, mental/mood changes, fever, seizures, irregular/fast heartbeat, increased sweating. Males - in the unlikely event you have a painful, prolonged erection, stop using this drug and seek immediate medical attention or permanent problems could occur. In the unlikely event you have a serious allergic reaction to this drug, seek immediate medical attention. Symptoms of a serious allergic reaction include: rash, itching, swelling, severe dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.
PRESCRIBED FOR: Promethazine is prescribed for treating nausea or vomiting, motion sickness, and allergic reactions and for sedation.
Phenothiazines such as promethazine can cause skin hyperpigmentation (darkening) but usually only after prolonged use. The effect usually is restricted to areas of the body exposed to sunlight. Thus, people who need long-term treatment with promethazine should either keep out of the sun or use effective sunscreens.
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