Generic name: Triazolam.

Halcion is a benzodiazepine sedative. It selectively reduces the activity of certain brain chemicals. 

Quick Facts About Halcion


Used to treat insomnia on a short-term basis.

Halcion Dosage

Take exactly as prescribed; adhere to dosage schedule strictly. May take with food to avoid stomach upset To avoid withdrawal symptoms, gradually stop medication as directed by your doctor. Do not take on airplane flights less than 7 or 8 hours to avoid traveler’s amnesia.

  • Usual adult dose: 0.25 milligram before bedtime. Never take more than 0.5 milligram. Seniors — 0.125 milligram, up to 0.25 milligram.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: should take only as needed.

Halcion Side Effects

Overdose symptoms:

apnea (temporary breathing stoppage), coma, confusion, excessive sleepiness, problems in coordination, seizures, shallow or difficult breathing, slurred speech. If you suspect an overdose, immediately seek medical attention. Halcion overdose can be fatal.

More common side effects: coordination problems, dizziness, drowsiness, headache, light-headedness, nausea and vomiting, nervousness.

Less common or rare Halcion side effects: aggressiveness, agitation, behavior problems, burning tongue, changes in sexual drive, chest pain, confusion, congestion, constipation, cramps or pain, delusions, depression, diarrhea, disorientation, dream abnormalities, drowsiness, dry mouth, exaggerated sense of well-being, excitement, fainting, falling, fatigue, hallucinations, impaired urination, inappropriate behavior, incontinence, inflammation of the tongue and mouth, irritability, itching, loss of appetite, loss of sense of reality, memory impairment, memory loss, menstrual irregularities, morning hangover effects, muscle spasms in the shoulders or neck, nightmares, rapid heart rate, restlessness, ringing in the ears, skin inflammation, sleep disturbances including insomnia, sleepwalking, slurred or difficult speech, stiff awkward movements, taste changes, tingling or pins and needles, tiredness, visual disturbances, weakness, yellowing of the skin and eyes.


Inform your doctor before combining Halcion with:

antidepressants including Elavil and MAO inhibitors such as Nardil and Parnate; antihistamines such as Benadryl and Tavist; barbiturates such as phenobarbital and Seconal; cimetidine (Tagamet); erythromycin (E.E.S., PCE, or E-Mycin); isoniazid (Nydrazid); narcotic painkillers such as Mellaril and Thorazine; other tranquilizers such as BuSpar, Valium, and Xanax; oral contraceptives; seizure medications such as Dilantin and Tegretol.

Avoid alcohol when taking Halcion. 

Special Cautions

Should not take if pregnant or breastfeeding; benzodiazepines are associated with damage to a developing fetus.

Seniors are prescribed lower doses.

Not generally prescribed for children.

  • Inform your doctor if you need Halcion for relief of insomnia for more than 7 to 10 days.
  • Should not take if allergic to this or similar medications such as Valium.
  • May develop tolerance (loss of effectiveness) or dependence if used nightly for a few weeks, or at consistently high doses.
  • Immediately contact your doctor if you experience unusual and disturbing thoughts or behavior.
  • May observe increased daytime anxiety.
  • At the beginning of Halcion therapy, may impair your ability to operate machinery or perform potentially hazardous activities; use with extreme caution.
  • Immediately after discontinuing medication completely, may experience rebound insomnia (worse than before Halcion therapy).
  • May experience anterograde amnesia (memory loss after an injury).
  • Use with caution if you have liver or kidney problems, lung problems, or sleep apnea.


HealthSurvey.org provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Halcion side effects, please contact your healthcare provider.