Melatonin Dosage
Calculate your melatonin dosage for sleep, jet lag, beta-blocker insomnia, and endometriosis. Get indication-specific dose recommendations with breakdowns and charts.
About This Calculator
This Melatonin Dosage Calculator helps you determine the appropriate melatonin dose based on your specific condition or indication. Melatonin is a naturally occurring hormone that regulates the sleep-wake cycle, and supplemental melatonin is commonly used to treat sleep disorders, jet lag, shift-work sleep disruption, and other conditions. Our calculator provides evidence-based dosing recommendations derived from published medical literature and clinical guidelines.
Unlike many medications that are dosed by body weight, melatonin requires fixed doses depending on the medical indication. For trouble falling asleep, the recommended dose ranges from 0.3 to 5 mg taken 1 hour before bedtime. Jet lag management follows specific protocols based on travel direction — eastbound travel requires pre-treatment starting 2 days before departure, while westbound treatment begins after arrival. Higher doses of 10 mg daily are used for endometriosis-related pain management under medical supervision (Schwertner et al., Pain, 2013).
The calculator supports four medication forms: tablets or capsules (with selectable strengths from 0.5 mg to 10 mg), liquid preparations (with custom concentration), nasal sprays, and oral strips. You can optionally enter a therapy duration to calculate the total amount needed for your treatment course. Results include the recommended daily dose in milligrams, the number of units (tablets, mL, sprays, or strips) per administration, and total quantity for the full therapy period.
Important Safety Information
Melatonin is generally safe when used appropriately, but it is not regulated as a drug by the FDA or equivalent authorities in most countries. Always start with the lowest effective dose, do not exceed 10 mg daily without medical supervision, and limit continuous use to the recommended duration for your indication. Side effects may include drowsiness, dizziness, headaches, and vivid dreams. Discontinue use and seek medical attention if you experience signs of allergic reaction.
Frequently Asked Questions
How much melatonin should I take for sleep?
For trouble falling asleep, the recommended melatonin dosage is 0.3 to 5 mg daily, taken 1 hour before sleep. Start with the lowest possible dose and increase only if needed. Always consult a healthcare provider before starting melatonin.
Is melatonin dosed by weight?
No, melatonin is not dosed by weight. Unlike many medications, melatonin requires fixed amounts for different indications rather than weight-based dosing. The dose depends on the condition being treated, not the person's body weight.
How much melatonin should I take for jet lag?
For eastbound travel (e.g., US to Europe), take 0.5-5 mg for 2 days before the flight around 7 PM and continue for 4 days after arrival before bed. For westbound travel (e.g., Europe to US), take 0.5-5 mg for 4 days after arrival before going to bed.
What is the maximum safe dose of melatonin?
The average safe dose range for adults is 0.5-10 mg daily. Harmful effects typically begin at around 30 mg, though this threshold varies between individuals. Always start with the lowest effective dose and do not exceed the recommended duration for your specific indication.
Can children take melatonin?
Children can take melatonin but only under strict medical supervision. The starting dose for children should be 0.5-1 mg, taken 30-60 minutes before sleep. It is not recommended for healthy children to take melatonin daily without a doctor's advice. Always consult a pediatrician first.
What are the side effects of melatonin?
Melatonin may cause drowsiness, dizziness, headaches, nausea, or vivid dreams when used improperly. Allergic reactions (swelling, hives, trouble breathing) require immediate medical attention. Melatonin should not cause side effects when used at appropriate doses for the correct duration.
Does melatonin work for endometriosis?
Clinical research published in Pain journal (2013) suggests that 10 mg of melatonin daily for up to 8 weeks may help reduce pain associated with endometriosis. This should only be done under medical supervision. Consult your gynecologist before using melatonin for endometriosis.
How long does melatonin take to work?
Melatonin typically starts working within 30-60 minutes after taking it. For trouble falling asleep, take it 1 hour before your intended bedtime. For jet lag, begin taking it a few days before travel (eastbound) or immediately after arrival (westbound).