Melatonin Opq Labs (Melatonin)

Melatonin is a melatonin receptor agonist used to address disorders of the sleep‑wake cycle.

• Insomnia: helps reduce time to fall asleep and improve sleep quality in adults with difficulty initiating sleep.
• Jet lag: assists in realigning circadian rhythms after rapid time‑zone travel, facilitating quicker adjustment to new sleep schedules.
• Shift work disorder: supports sleep onset and daytime alertness for individuals working non‑standard hours.

• Melatonin binds to MT1 and MT2 receptors in the suprachiasmatic nucleus, mimicking endogenous melatonin. Activation of MT1 reduces neuronal firing during the night, while MT2 phase‑shifts circadian rhythms by modulating clock gene expression. This dual receptor agonism synchronizes the internal biological clock with the external light‑dark cycle, promoting sleep onset. The effect enhances the natural decline in alertness in the evening and facilitates the transition to sleep.

Melatonin may cause a range of adverse reactions, which are generally mild but can be serious in rare cases.

Common Side Effects

• Headache: mild headache reported after ingestion.
• Dizziness: transient light‑headedness or vertigo.
• Daytime sleepiness: feeling unusually drowsy during waking hours.
• Gastrointestinal discomfort: nausea or mild stomach upset.

Serious or Rare Side Effects

• Allergic reaction: rash, itching, swelling, or anaphylaxis.
• Mood changes: depression, anxiety, or irritability.
• Cardiovascular symptoms: chest pain or palpitations.

When using melatonin, several precautions should be considered to ensure safe and effective use.

• Pregnancy: safety not established; consult a healthcare provider before use.
• Breastfeeding: unknown safety profile; weigh potential benefits against risks.
• Pediatric use: not recommended without medical supervision.
• Drug interactions: avoid concurrent use with CNS depressants without professional guidance.
• Medical conditions: caution in patients with epilepsy or depressive disorders.
• Store at ambient temperature below 25°C: keep in original container, protect from moisture and light.

Melatonin can interact with other medicines, requiring attention to avoid reduced efficacy or heightened adverse effects.

Major Interactions (Avoid)

• Anticoagulants: may increase bleeding risk.
• Immunosuppressants: may reduce therapeutic effectiveness.
• CYP1A2 inhibitors: can raise melatonin plasma levels.

Moderate Interactions (Monitor Closely)

• CNS depressants: additive sedation may occur.
• Hormonal contraceptives: possible reduction in melatonin effectiveness.
• Antidepressants (SSRIs): may increase risk of side effects such as dizziness.