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.
Promethazine oral is an antihistamine. It blocks the effects of the naturally occurring chemical histamine in your body. Promethazine oral is used to treat allergy symptoms such as itching, runny nose, sneezing, itchy or watery eyes, hives, and itchy skin rashes.
Concurrent use of promethazine with the dye used for myelography (x-rays of the spinal cord) can lower the threshold for seizures and thus increase the risk of seizures. Promethazine should be stopped at least 48 hours before myelography and not restarted until at least 24 hours after myelography.
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