Melatonin Unimedic Pharma (Melatonin)

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

• Insomnia: facilitates sleep onset and may improve sleep continuity in individuals with difficulty falling asleep.
• Jet lag: helps realign circadian rhythm after rapid time‑zone travel, reducing sleep disturbances.
• Sleep disorders: supports overall sleep quality in conditions such as delayed sleep phase syndrome.

• Melatonin binds to MT1 and MT2 receptors in the suprachiasmatic nucleus, mimicking the endogenous hormone released by the pineal gland. Activation of these G‑protein‑coupled receptors reduces neuronal firing, signaling the body that it is night time, thereby promoting the initiation of sleep and helping to synchronize the circadian rhythm. This pharmacologic effect contributes to the regulation of hormonal secretion, body temperature, and blood pressure during the night.

Melatonin is generally well tolerated, but some users may experience adverse reactions.

Common Side Effects

• Drowsiness: feeling of sleepiness during daytime.
• Headache: mild to moderate head pain.
• Dizziness: sensation of light‑headedness.
• Nausea: mild stomach upset.
• Vivid dreams: unusually intense or memorable dreams.

Serious or Rare Side Effects

• Allergic reaction: rash, itching, swelling, or difficulty breathing.
• Mood changes: depression or increased anxiety.
• Hormonal effects: menstrual irregularities in women.
• Severe hypotension: marked drop in blood pressure causing faintness.

When considering melatonin therapy, certain precautions should be observed to ensure safe use.

• Pregnancy: safety has not been established; use only if clearly needed.
• Breastfeeding: limited data; weigh potential benefits against risks.
• Concomitant CNS depressants: may enhance sedative effects; monitor closely.
• Underlying medical conditions: assess for depression, seizure disorders, or autoimmune disease before use.
• Drug interactions: review all concurrent medications for potential interactions.
• Store at ambient temperature: keep below 25 °C, retain in original container, protect from moisture and light.

Melatonin can interact with several medicines, altering its efficacy or increasing adverse effects.

Major Interactions (Avoid)

• Anticoagulants: may increase bleeding risk; avoid concurrent use.
• Immunosuppressants: could reduce immune response; avoid combination.

Moderate Interactions (Monitor Closely)

• Sedatives or hypnotics: additive sleep‑inducing effect; monitor sedation level.
• Oral contraceptives: may decrease contraceptive effectiveness; advise alternative protection.
• Antidepressants (SSRIs, SNRIs): potential for serotonin syndrome; observe for symptoms.
• Antihypertensives: melatonin may enhance blood pressure lowering; monitor BP.