Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Halcion 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:
daytime anxiety;
unusual changes in mood or behavior;
confusion, memory loss, agitation, hallucinations; or
depression, suicidal thoughts.
Some people using Halcion have engaged in activity such as driving, eating, making phone calls, or having sex and later having no memory of the activity. Tell your doctor if this happens to you.
The sedative effects of triazolam may last longer in older adults. Accidental falls are common in elderly patients who take benzodiazepines. Use caution to avoid falling or accidental injury while you are taking Halcion.
Common side effects may include:
daytime drowsiness (or during hours when you are not normally sleeping);
loss of coordination;
dizziness; 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.
 Halcion side effects (more detail)
