Excessive sedation may occur when promethazine is combined with other medications that depress the central nervous system (brain) and cause sedation. Such drugs include ethanol, barbiturates, anti-anxiety medications, sedatives, other phenothiazines, and narcotic pain medications.
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.
SIDE EFFECTS: Constipation, drowsiness, vision changes or dry mouth may occur. If any of these effects persist or worsen, notify your doctor. Unlikely to occur but report promptly: restlessness, muscle stiffness, weakness, difficulty speaking, loss of balance, mask- like facial expression, trembling or shaking, dizziness, lip smacking or other uncontrollable movements, difficulty urinating, skin rash/discoloration. Very unlikely to occur but report promptly: persistent sore throat or fever, unusual bleeding or bruising, stomach pain, yellowing of eyes or skin, dark urine, hot dry skin, vomiting. This drug may infrequently cause a very serious (rarely fatal) nervous system disorder (neuroleptic malignant syndrome).
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