Sleeping Pills in Japan: No Melatonin — Here's What Works Instead
Japan doesn't sell melatonin over the counter. Here's what's actually available at the pharmacy — and how to use it safely.
Go looking for melatonin at a Japanese pharmacy and you'll come up empty. It's not there — not at Matsumoto Kiyoshi, not at Welcia, not at any chain drugstore. Japan doesn't sell melatonin over the counter, and that surprises a lot of foreigners who rely on it back home.
What Japan does have is ドリエル (Drewell) — an antihistamine repurposed as a sleep aid. It works differently from melatonin, but it's the closest you'll get without a prescription.
Why Melatonin Isn't Available at Japanese Pharmacies
In Japan, melatonin has not been approved as a pharmaceutical or quasi-drug (医薬品・医薬部外品) for general over-the-counter sale. That means it can't be stocked on pharmacy shelves the way it is in the US, UK, or Australia.
Some clinics can prescribe low-dose melatonin for specific conditions like jet lag in children, and a handful of supplement importers carry it — but the easy, grab-it-off-the-shelf access you might be used to simply doesn't exist here. If you need something to help you sleep, you're working with what Japanese pharmacies actually stock.
Japan's Main OTC Sleep Aid: ドリエル (Drewell)
ドリエル (Drewell) is made by SS Pharmaceutical (エスエス製薬) and classified as a Class 2 OTC medicine (第2類医薬品). You'll find it in the 睡眠改善薬 (sleep improvement medicine) section of most Japanese drugstores.
Its active ingredient is diphenhydramine hydrochloride (ジフェンヒドラミン塩酸塩) — an antihistamine better known for treating allergies and itching, but one that also causes drowsiness. Drewell uses that drowsiness effect intentionally to help you fall asleep.
The back of the box — ingredients, dosage, and warnings in Japanese. Use this to verify the product at the pharmacy.
How it works
Deep in the brain, histamine neurons release histamine that keeps you awake. Diphenhydramine blocks those receptors, cutting off that wake signal — that's the drowsiness you feel. Drewell is built around that side effect.
Dosage
Take 2 tablets before bed on nights you can't fall asleep or keep waking up. Once per day, with water or lukewarm water.
| Age | Single dose | Times per day | Timing |
|---|---|---|---|
| Adults (15 and over) | 2 tablets | Once | Before bed only |
| Under 15 | Do not take | ||
Do not exceed 2 tablets. Taking more can cause nervous excitation and paradoxically make it harder to sleep.
Drowsiness may carry over to the next day. Do not drive or operate machinery until any grogginess or lethargy has fully passed.
Before removing from the PTP blister pack: press the raised side firmly with your fingertip to break the foil backing, then take out the tablet. Do not swallow the tablet still in the sheet — it can injure your esophagus.
Who Should NOT Take Drewell
Do not take if you:
- ✕Are pregnant or possibly pregnant
- ✕Are under 15 years old
- ✕Have chronic or habitual insomnia (regular, ongoing sleep problems)
- ✕Have been diagnosed with an insomnia disorder
Drewell is for temporary insomnia — the kind caused by stress, nerves, or an irregular schedule. If poor sleep is your everyday reality, this isn't the answer.
Consult a Doctor, Pharmacist, or Registered Salesperson Before Use If You:
- •Are under medical treatment
- •Are elderly — drowsiness may be stronger than expected, or conversely, you may experience nervous excitation
- •Have had allergic reactions to medicines in the past
- •Have difficulty urinating
- •Have been diagnosed with glaucoma or an enlarged prostate
Side Effects
Stop immediately and consult a doctor, pharmacist, or registered salesperson, bringing this package insert with you, if you notice any of the following:
| Area | Symptoms |
|---|---|
| Skin | Rash, redness, itching |
| Digestive | Stomach pain, nausea, vomiting, loss of appetite |
| Nervous system | Dizziness, headache, morning grogginess, daytime drowsiness, discomfort, nervousness, temporary impaired consciousness (reduced attention, drowsy-like state, impaired judgment, abnormal behavior or speech) |
| Cardiovascular | Palpitations |
| Urinary | Difficulty urinating |
| Other | Fatigue |
Also stop and consult if dry mouth or diarrhea persists or worsens after taking Drewell.
If symptoms do not improve after 2–3 doses, stop taking and consult a doctor, pharmacist, or registered salesperson.
Important Warnings
- 🚗 Do not drive or operate machinery after taking. Drowsiness may persist until the following morning.
- 🍺 Do not drink alcohol before or after taking Drewell.
- 💊 Do not combine with: other sleep aids, cold medicines, pain relievers, cough medicines, or any antihistamine-containing medicine — including allergy tablets, nasal medicines, and motion sickness drugs.
- 📅 Do not use continuously. Take only on nights when you're having trouble falling asleep or sleeping lightly. Not for regular, nightly use.
- 🤱 Breastfeeding: Do not take Drewell, or stop breastfeeding if you take it.
Where to Buy in Japan
Drewell is sold at most Japanese drugstore chains — Matsumoto Kiyoshi (マツモトキヨシ), Welcia (ウエルシア), Sundrug (サンドラッグ), and others. Look for the 睡眠改善薬 (sleep improvement medicine) section, usually near the cold medicine or allergy aisle.
It comes in a 6-tablet pack (6錠) and a 12-tablet pack (12錠). The 12-tablet pack makes more sense if you think you'll need it a few times.
Looking for more OTC medicines in Japan?
OTC Guide Japan translates Japanese medicine labels and package inserts into English — so you know exactly what you're taking before you buy.
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