Get emergency medical help if you have any signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using Phenergan and call your doctor at once if you have:
severe drowsiness, weak or shallow breathing;
a light-headed feeling, like you might pass out;
confusion, agitation, hallucinations, nightmares;
seizure (convulsions);
fast or slow heartbeats;
jaundice (yellowing of the skin or eyes);
uncontrolled muscle movements in your face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement);
easy bruising or bleeding (nosebleeds, bleeding gums);
sudden weakness or ill feeling, fever, chills, sore throat, mouth sores, red or swollen gums, trouble swallowing; or
very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out.
Side effects such as confusion and severe drowsiness may be more likely in older adults.
Common Phenergan side effects may include:
drowsiness, dizziness;
ringing in your ears;
double vision;
feeling nervous;
dry mouth; or
tired feeling, sleep problems (insomnia).
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Phenergan side effects (more detail)
