Restamin Kowa Alpha Tablets
レスタミンコーワα錠
Antihistamine
Tablets 27
Itching caused by eczema or contact dermatitis, hives (urticaria), rhinitis
Active Ingredients (per 3 tablets (daily dose))
Diphenhydramine hydrochloride 90 mg
Inactive Ingredients
Lactose, cellulose, hydroxypropyl cellulose, magnesium stearate, hypromellose, macrogol, talc, titanium oxide, iron sesquioxide, carnauba wax
Instructions for Use
- ✓Take with water or lukewarm water. Can be taken with or without food. Take at least 4 hours apart.
| Age | Dose per use | Times per day |
|---|---|---|
| Adults (15 and older) | 1 tablet | 3 times daily |
| Under 15 years | Do not use | — |
- ✓To remove tablets from the blister pack: press firmly on the raised part of the PTP sheet to break through the aluminum foil on the back, then take out the tablet. Do not swallow the PTP sheet whole, as it may pierce the esophageal lining and cause serious injury.
- ✕Do not take with other allergy medicines, cold medicines, cough medicines, nasal allergy medicines, motion sickness medicines, or any other oral medicine containing antihistamines.
- ✕Do not operate vehicles or machinery after taking (may cause drowsiness).
- ✕Do not take if you are breastfeeding, or stop breastfeeding if you take this medication.
- ✕Do not drink alcohol before or after taking.
- ✕Do not use long-term.
- ✕Do not exceed the recommended dose.
- ⚠Consult a doctor, pharmacist, or registered salesperson before use if you:
- (1) Are under medical treatment.
- (2) Are pregnant or possibly pregnant.
- (3) Have had allergic reactions to medicines in the past.
- (4) Have difficulty urinating.
- (5) Have been diagnosed with glaucoma.
- ✓Stop use immediately and consult a doctor, pharmacist, or registered salesperson, bringing this package insert with you, if any of the following occur after use:
- Skin: rash, redness, itching
- Digestive: nausea, vomiting, loss of appetite
- Urinary: difficulty urinating
- ✓If dry mouth or drowsiness persists or worsens, stop use and consult a doctor, pharmacist, or registered salesperson, bringing this package insert with you.
- ✓If symptoms do not improve after 5–6 days, stop and consult a doctor, pharmacist, or registered salesperson, bringing this package insert with you.
- ✓Store in a cool, dry place away from direct sunlight. Keep out of reach of children. Do not transfer to another container. Handle carefully to avoid breaking the blister pack foil or damaging the tablets. Do not use after the expiry date printed on the outer box.
Additional Information
Diphenhydramine hydrochloride works from within the body to suppress allergic reactions and relieve itching and other symptoms. Unlike topical creams, this oral antihistamine can address whole-body itching and hives. Effective with just 1 tablet per dose.
Particularly suited for those who itch so severely they cannot fall asleep, wake up in the middle of the night due to itching, or scratch in their sleep.
Sources & Documents
- Japanese product page
- Japanese PDF
- Last verified: June 4, 2026
Related Medicines
For informational purposes only. Always consult a doctor or pharmacist before taking any medication.