Get emergency medical help if you have signs of an allergic reaction to Xanax: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Alprazolam can slow or stop your breathing, especially if you have recently used an opioid medication, alcohol, or other drugs that can slow your breathing. A person caring for you should seek emergency medical attention if you have weak or shallow breathing, if you are hard to wake up, or if you stop breathing.
Call your doctor at once if you have:
weak or shallow breathing;
a light-headed feeling, like you might pass out;
a seizure;
hallucinations, risk-taking behavior;
increased energy, decreased need for sleep;
racing thoughts, being agitated or talkative;
double vision; or
jaundice (yellowing of the skin or eyes).
The sedative effects of alprazolam may last longer in older adults. Accidental falls are common in elderly patients who take benzodiazepines. Use caution to avoid falling or accidental injury.
Common Xanax side effects may include:
drowsiness; or
feeling light-headed.
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.
 Xanax side effects (more detail)
