Melatonin is a sleep-timing signal, not a strong sedative. For an adult with occasional difficulty falling asleep, start with the lowest dose on the product label, often 0.5 to 1 milligram, about 30 to 60 minutes before bedtime. Do not take an extra dose if you do not fall asleep right away.
| Question | Practical answer |
|---|---|
| When should you take melatonin? | Usually 30 to 60 minutes before bed. Some prescription or slow-release products are taken 1 to 2 hours before bed. |
| How much should you take? | Use the lowest labeled dose. A cautious adult starting amount is often 0.5 to 1 mg. |
| Should you take it with food? | Follow the product instructions. Food instructions vary by formulation. |
| Can you take more if it does not work? | No. Do not repeat the dose during the same night. |
| How long should you use it? | Use it short term unless a healthcare professional recommends longer treatment. |
| Can children take melatonin? | Only after speaking with a pediatrician or another healthcare professional. |
Step-by-step: How to Take Melatonin
Check the label and serving size. Melatonin is sold as tablets, capsules, gummies, liquids and extended-release products. The amount per serving can vary widely.
Start with a low dose. For occasional use, begin with the lowest practical dose instead of starting with a 5 or 10 mg product. A higher dose does not necessarily improve sleep and may increase next-day drowsiness.
Take it before your planned bedtime. Immediate-release melatonin is usually taken 30 to 60 minutes before bed. Prescription and extended-release products may have different instructions, so follow the package, pharmacist or prescriber's directions.
Get ready for sleep. Dim the lights, avoid stimulating activities and go to bed at your planned time. Bright light at night can suppress the body's natural melatonin production.
Swallow extended-release tablets whole. Do not cut, crush or chew a slow-release tablet unless the product instructions allow it. Standard tablets may have different instructions.
Skip a missed dose. If you forget melatonin at bedtime, do not double the dose the next night. Resume your usual schedule.
How Much Melatonin Should Adults Take?
Adults should use the lowest labeled dose that helps. There is no single FDA-approved standard dose for over-the-counter melatonin supplements in the United States.
Some clinical guidance uses 2 mg of slow-release melatonin for particular sleep problems. Other sleep specialists recommend starting at about 1 mg or less for occasional difficulty falling asleep. Avoid increasing the dose repeatedly without discussing the problem with a healthcare professional, especially if insomnia continues beyond a short period.
How Should You Take Melatonin for Jet Lag?
For jet lag, take melatonin at the destination's normal bedtime for a limited number of nights. The correct timing can depend on the direction of travel and the product you use.
NHS guidance lists 3 mg once daily for up to five days for adults. It advises taking the first dose at the destination's bedtime, not before 8 p.m. or after 4 a.m. local time. Follow the instructions for your specific product.
How Should You Take Melatonin for a Delayed Sleep Schedule?
Melatonin timing for a delayed sleep schedule can differ from timing used as a bedtime sleep aid. If you regularly cannot fall asleep until very late and struggle to wake in the morning, the problem may involve delayed sleep-wake phase disorder rather than ordinary insomnia.
A sleep clinician can help combine a consistent wake time, morning light exposure and carefully timed melatonin.
When Should You Avoid Melatonin Without Medical Advice?
Speak with a doctor or pharmacist before taking melatonin if you:
- Take warfarin or another blood thinner
- Have epilepsy or a seizure disorder
- Are pregnant, trying to become pregnant or breastfeeding
- Take antidepressants, sedatives, sleep medicines or other supplements
- Take ramelteon, tasimelteon, fluvoxamine, carbamazepine or certain antibiotics
- Have liver disease, an immune-system condition, a hormone disorder or another serious medical condition
- Are an older adult, particularly if you have dementia
Melatonin can interact with medicines, and its long-term safety is not well established. Alcohol can increase impairment and side effects such as dizziness or reduced coordination.
What Are the Common Side Effects of Melatonin?
Short-term side effects can include:
- Next-day sleepiness
- Headache
- Dizziness
- Nausea
- Vivid dreams or mood changes
Do not drive, operate machinery or perform other safety-sensitive tasks until you know how melatonin affects you. Stop using it and seek medical advice if you develop confusion, severe mood changes, an allergic reaction or unusual sleep behaviors.
Is Melatonin Effective for Chronic Insomnia?
Melatonin may help some people fall asleep, but the evidence is not strong enough to make it the main treatment for chronic insomnia. Cognitive behavioral therapy for insomnia, or CBT-I, is a recommended first-line treatment.
If sleep problems continue after a short trial of melatonin, do not keep increasing the dose. A healthcare professional can check for anxiety, depression, sleep apnea, restless legs syndrome, medication effects or an inconsistent sleep schedule.
Is Melatonin Safe for Children?
Do not give melatonin to a child without first speaking with a pediatrician. Melatonin is a hormone, and its long-term effects in children are not fully understood. Some gummy products have also been inaccurately labeled.
Store melatonin securely. Accidental ingestion by a young child can cause an emergency.
What Should You Do If You Take Too Much Melatonin?
An excessive amount of melatonin commonly causes sleepiness, headache, nausea or dizziness. The amount that causes serious toxicity is not clearly established.
In the United States, call Poison Control at 1-800-222-1222 for immediate guidance. Call 911 if the person cannot be awakened, has abnormal breathing, has a seizure or is seriously confused.
In the United States, melatonin is sold as a dietary supplement. The FDA does not approve individual supplements for safety and effectiveness before they reach the market. Choose a reputable product, follow the label and consider third-party quality verification such as USP Verified.