[Class 1 OTC drug] Gaster 10 (12 tablets) [Self-medication tax system target]

【caution! ] This product is a pharmaceutical product.

* Please read the precautions for use carefully and follow the usage and dosage of medicines and use them correctly.

Sale price¥1,027(税込)
In stock (9999 units), ready to be shipped

Usually ships within 2-4 business days

Store inventory

*The number of days may change depending on the delivery area.

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*Store pickup is not a store inventory service. This item will be ordered from the warehouse.

*If you add it to your favorites, you will receive an email when it is restocked or when the price drops.


Subject to self-medication tax system *For safer use, we limit the number of purchases of "Famotidine preparations (Gaster 10 series, etc.)" (up to 14 days at most).
In the unlikely event that we find an order that exceeds the number of purchases, we will cancel it.

● "Gaster 10" is a type of gastrointestinal drug that controls excess gastric acid, which causes gastric symptoms, and speeds up the repair of the gastric mucosa.

Precautions for use

・If symptoms do not improve after taking this medicine for 3 days, stop taking this medicine and consult a doctor or pharmacist with this leaflet.
・Do not take continuously for more than 2 weeks.
(Because there is a risk of overlooking serious digestive disorders, please consult a doctor.)
Do not do
(If you do not follow these precautions, your current symptoms will worsen and side effects will likely occur.)
1. The following people should not take this medicine.
(1) Persons who have had allergic symptoms (e.g., rash/redness, itching, swelling of the throat, eyelids, lips, etc.) due to H2 blocker drugs such as famotidine
(2) Those who are receiving treatment for the following diseases or medicines at a medical institution
Blood diseases, kidney/liver diseases, heart diseases, stomach/duodenal diseases, immune system diseases such as asthma/rheumatism, steroids, antibiotics, anticancer agents, azole antifungal agents
(It may cause white blood cell decrease, platelet decrease, etc.)
(If you have a kidney or liver disease, the excretion of the drug may be delayed and the effect may be stronger.)
(If you have a heart disease such as myocardial infarction, valvular disease, or cardiomyopathy, you may experience palpitations accompanied by an abnormal electrocardiogram.)
(People who are being treated for gastric/duodenal disease are likely to be prescribed famotidine or similar drugs, so caution should be exercised regarding double doses.)
(The absorption of azole antifungal agents is reduced and the effect is attenuated.)
(3) Persons who have been pointed out by a doctor for blood abnormalities such as low red blood cell count (anemia), low platelet count (difficult to stop bleeding, easy bleeding), low white blood cell count, etc.
(This drug may trigger blood abnormalities again)
(4) Children (under 15 years old) and elderly people (over 80 years old)
(5) pregnant or suspected to be pregnant
2. Do not take the following medicines while taking this drug.
other gastrointestinal drugs
3. Do not take this drug if you are breastfeeding, or avoid breastfeeding if you are taking this drug.
■ to consult
1. The following people should consult a doctor or pharmacist before taking this medicine.
(1) Persons receiving medical treatment from a doctor or taking other medicines
(2) Persons who have had allergic symptoms due to drugs, etc.
(3) Elderly (age 65 and older)
(In general, elderly people may have decreased physiological functions.)
(4) Persons with the following symptoms
Sore throat, cough and high fever (Those with these symptoms are suspected of having a serious infection, and blood abnormalities such as a decrease in blood count may be observed. If you have such symptoms before taking this medicine, , symptoms may be exacerbated by taking this drug, and you may be late in noticing side effects of this drug), unexplained weight loss, persistent abdominal pain (may be caused by other illnesses)

2. If the following symptoms appear after taking this medicine, they may be side effects.

[Affected site: Symptoms]
Skin: rash/redness, itching, swelling
Cardiovascular: Disturbed pulse
Neuropsychiatric: nausea, spasms
Others: Feeling unwell, dullness, fever and sore throat.

In rare cases, the following serious symptoms may occur: In that case, please consult a doctor immediately.

[Symptom Name: Symptom]
Shock (anaphylaxis): Skin itching, hives, hoarseness, sneezing, throat itching, breathing difficulties, palpitations, clouding of consciousness, etc. may occur immediately after taking this medicine.
Oculomucocutaneous syndrome (Stevens-Johnson syndrome): High fever, bloodshot eyes, eye mucus, sores on the lips, sore throat, extensive rash/redness of the skin, etc. persist or suddenly worsen.
Toxic epidermal necrolysis: High fever, bloodshot eyes, eye mucus, sore lips, sore throat, extensive rash/reddening of the skin, etc. may persist or worsen rapidly.
Rhabdomyolysis: muscle pain in limbs, shoulders, waist, etc., numbness in limbs, weakness, stiffness, general malaise, reddish-brown urine, etc.
Liver dysfunction: fever, itching, rash, jaundice (yellowing of skin and whites of eyes), brown urine, general malaise, loss of appetite, etc. may occur.
Renal disorder: Fever, rash, general swelling, general malaise, arthralgia (joint pain), diarrhea, etc. may occur.
Blood disorders: sore throat, fever, general malaise, whitening of the face and the back of the eyelids, easy bleeding (bleeding gums, nosebleeds, etc.), bruising (color does not disappear even when pressed), etc. .
Interstitial pneumonia: Shortness of breath/difficulty in breathing, dry cough, fever, etc. occur when climbing stairs or exerting a little force, and these may appear suddenly or persist.

3. If you accidentally take more than the prescribed dose, stop taking it immediately and consult your doctor or pharmacist with this document.
4. The following symptoms may appear after taking this medicine. If such symptoms persist or worsen, stop taking this medicine and consult a doctor or pharmacist with this leaflet.
Constipation, loose stools, diarrhea, dry mouth


When symptoms of stomachache, heartburn, heavy feeling, or nausea appear, take the following amount with water or hot water.
[Age: once dose: number of doses per day]
Adults (15 years old or over, under 80 years old): 1 tablet: up to 2 times
Children (under 15 years of age): Do not take.
Elderly (over 80 years old): Do not take.
・If symptoms do not subside after 8 hours, take another tablet.
・When the symptoms subside, stop taking the medicine.
・If symptoms do not improve after taking this medicine for 3 days, stop taking this medicine and consult a doctor or pharmacist.
・Do not take continuously for more than 2 weeks.
in 1 tablet
Ingredients: Quantity
Famotidine: 10mg
12 tablets
Daiichi Sankyo Healthcare Co., Ltd. Customer Service Office Phone: 03-5205-8331
Reception hours: 9:00-17:00 (excluding Saturdays, Sundays, and holidays)
Daiichi Sankyo Healthcare Co., Ltd.
[Class 1 drugs]
sea bream
Gaster 10


・If symptoms do not improve after taking this medicine for 3 days, it is recommended to see a doctor. In addition, do not take for more than 2 weeks even if symptoms improve.
・Avoid alcohol, coffee, spices, and other substances that stimulate the stomach and intestines while you have symptoms.
・If symptoms do not subside even after taking this medicine, or if symptoms persist, see a doctor as soon as possible.
・If you experience any worrisome symptoms after using this product, discontinue use and consult a doctor or pharmacist.
・Please read the package insert carefully before use. If you have any questions, please consult your pharmacist.

Disclaimer/advertising content

*Please note that the packaging and design are subject to change without notice.
* Depending on the delivery area, it may take longer to deliver than the number of days indicated.
*Gift wrapping is not available.
*Please note that large orders such as consecutive purchases may be canceled.

Sundrug Co., Ltd./Phone number: 0120‐009‐368



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