Europe — EMA
Halcion (Triazolam)
Halcion (triazolam) is a prescription benzodiazepine tablet used short‑term for insomnia; learn its uses, side effects, precautions, and interactions.
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What is Triazolam?
Halcion is a prescription medication that contains the benzodiazepine triazolam, supplied as oral tablets. It is marketed in the European Union and classified as a sedative‑hypnotic for short‑term management of insomnia. The drug works by enhancing the activity of the neurotransmitter GABA at the GABA‑A receptor, leading to increased neuronal inhibition and a calming effect. It is available only by prescription and is subject to regulatory control in many countries.
What is Triazolam used for?
Halcion (triazolam) is a benzodiazepine that is primarily indicated for the short‑term treatment of insomnia, especially when difficulty falling asleep is a major concern and other measures have not provided adequate relief.
- Short‑term relief of transient insomnia - Use in adults when non‑pharmacologic measures are insufficient - Adjunct to behavioral sleep therapy - Limited use in patients with severe sleep onset latency - May be prescribed for brief periods before travel or shift changes
What are the side effects of Triazolam?
Side effects of Halcion vary in frequency and severity; they are typically categorized as common, mild reactions and less frequent, serious events that may require medical attention.
Common: - Drowsiness or fatigue, which may affect daytime alertness - Dizziness or light‑headed feeling, especially after standing quickly - Short‑term memory impairment, such as difficulty recalling recent events - Headache, mild nausea, or gastrointestinal discomfort - Impaired coordination, increasing risk of falls or accidents
Serious: - Severe allergic reaction, including rash, swelling of the face or throat, or difficulty breathing - Paradoxical reactions such as agitation, aggression, anxiety, or visual hallucinations
What precautions apply to Triazolam?
When prescribing or using Halcion, clinicians and patients should observe several precautions to minimize risks and ensure safe use.
- Limit use to short durations (typically ≤2 weeks) to avoid dependence - Avoid use in patients with a history of substance abuse or severe depression - Do not operate machinery or drive until you know how the medication affects you - Caution in elderly patients due to increased sensitivity and fall risk - Pregnancy and breastfeeding status should be evaluated; use only if benefits outweigh risks - Concurrent use with other central nervous system depressants can enhance sedation - Gradual tapering is recommended when discontinuing after prolonged therapy
What does Triazolam interact with?
Halcion can interact with other medicines, altering its sedative effect or increasing the risk of adverse reactions; awareness of these interactions helps guide safe therapy.
Avoid: - Other benzodiazepines or barbiturates, which can cause excessive sedation or respiratory depression - Opioid analgesics, due to additive central nervous system depression - Alcohol, because it intensifies sedative effects and impairs coordination
Use with caution: - Antidepressants such as SSRIs or SNRIs, which may affect metabolism of triazolam - Antifungal agents (e.g., ketoconazole) or macrolide antibiotics, which can inhibit CYP3A4 and raise triazolam levels - Antihistamines or antipsychotics, which may increase drowsiness



