GASTER10 S Tablet

  • Class 1 Drug
  • Self-medication tax deductible
For stomach discomfort such as stomach pain and nausea. Fast-dissolving tablets that can be taken without water.
  • H2 Blocker Gastrointestinal Drug
  • Tablet
  • 15 to 80 years old
Photo: GASTER10 S tablet packaging and product
Notice of package design change for "GASTER10 Series" (October 2025)Open in new window

Manufacturer's suggested retail price *Tax included

6 tablets 1,078 yen / 12 tablets 1,738 yen

Brand site/SNS

Ideal for:

    For stomach troubles you want to address immediately / For stomach pain felt upon waking up or when hungry

More Information

  • 1. This drug is a different type of gastrointestinal medicine from gastric acid neutralizing medicines, and is highly effective in relieving stomach pain and nausea.
    2. It controls excess stomach acid, which causes unpleasant stomach symptoms, and promotes the repair of the gastric mucosa.
    3. It comes in a convenient PTP package that is easy to carry.
    4. These tablets dissolve quickly when exposed to moisture in the mouth and can be taken without water.

  • Things to avoid

    (If these guidelines are not followed, your current symptoms may worsen and side effects are more likely to occur.)

    1. Please do not take this medicine for the following people:
    (1) People who have experienced allergic symptoms (e.g. rash/redness, itching, swelling of the throat, eyelids, lips, etc.) due to H2 blocker drugs such as famotidine
    (2) Persons receiving treatment or medicine for the following diseases at a medical institution:
    Blood diseases, kidney and liver diseases, heart diseases, stomach and duodenal diseases, asthma, rheumatism and other immune system diseases, steroids, antibiotics, anticancer drugs, azole antifungal drugs
    (This may cause leukopenia, thrombocytopenia, etc.)
    (If you have kidney or liver disease, the excretion of the drug may be delayed and its effects may be stronger.)
    (If you have a heart disease such as myocardial infarction, valvular heart disease, or cardiomyopathy, you may experience a sluggish pulse accompanied by electrocardiogram abnormalities.)
    (People receiving treatment for gastric or duodenal diseases are likely to have been prescribed famotidine or similar drugs, so they should be careful not to take them multiple times.)
    (The absorption of azole antifungal agents decreases, weakening their effectiveness.)
    (3) Persons whose doctor has pointed out blood abnormalities such as low red blood cell count (anemia), low platelet count (bleeding is difficult to stop or bleeding easily), or low white blood cell count
    (This drug may become a trigger and cause blood abnormalities again.)
    (4) People with phenylketonuria (this drug contains L-phenylalanine compound)
    (5) Children (under 15 years old) and elderly (over 80 years old)
    (6) Pregnant women or those who appear 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.


    Things to consult


    1. Consult your doctor or pharmacist before taking this medicine if any of the following apply to you.
    (1) You are currently receiving medical treatment from a doctor or taking other medicines
    (2) You have had allergic symptoms due to drugs, etc.
    (3) Elderly (65 years of age or older)
    (In general, elderly individuals may have reduced physiological function.)
    (4) Individuals with the following symptoms:
    Sore throat, cough, and high fever (Individuals with these symptoms may be suspected of having a serious infection, and may exhibit blood abnormalities, such as decreased blood cell counts). If you have any of these symptoms before taking this medicine, they may worsen with use, and you may be slow to notice side effects. Unexplained weight loss, persistent abdominal pain (may be caused by another illness).

    2. If any of the following symptoms appear after taking this medicine, they may be side effects. Stop taking it immediately and consult your doctor or pharmacist with this document.
    [Affected area] [Symptom]
    Skin: Rash/redness, itching, swelling
    Circulatory system: Irregular heartbeat
    Neuropsychiatric system: Feeling of lightheadedness, convulsions (seizures)
    Other symptoms: Feeling unwell, lethargy, fever with sore throat.

    In rare cases, the following serious symptoms may occur. In that case, seek immediate medical attention.
    [Symptom name] Shock (anaphylaxis)
    [Symptoms] Immediately after taking the drug, symptoms such as skin itching, hives, hoarseness, sneezing, throat itching, shortness of breath, palpitations, and clouded consciousness may occur.

    [Symptom name] Stevens-Johnson Syndrome (SJS), Toxic Epidermal Necrolysis (TEN)
    [Symptoms] High fever, eye redness, eye discharge,  lip sores, sore throat, widespread skin rash/redness on the skin, etc. persist or worsen rapidly.

    [Symptom name] Rhabdomyolysis
    [Symptoms] Muscle pain in limbs, shoulders, lower back, etc.; numbness in limbs; weakness; stiffness; general fatigue; reddish-brown urine, etc.

    [Symptom name] Liver Dysfunction
    [Symptoms] Fever, itching, rash, jaundice (yellowing of skin and whites of the eyes), brown urine, general fatigue, and loss of appetite, etc.

    [Symptom name] Kidney Dysfunction
    [Symptoms] Fever, rash, decreased urine output, generalized swelling, general fatigue, joint pain (pain in the joints), diarrhea, etc. may occur.

    [Symptom name] Interstitial Pneumonitis
    [Symptoms] Shortness of breath or difficulty breathing when climbing stairs or exerting oneself slightly, dry cough, fever, etc. may occur suddenly or persistently.

    [Symptom name] Blood Disorder
    [Symptoms] Throat pain, fever, general fatigue, whitening of the face or inner eyelids, easy bleeding (gum bleeding, nosebleeds, etc.), bruising (persistent bruises that do not fade when pressed).

    3. If you accidentally take more than the prescribed dose, stop taking it immediately and consult your doctor or pharmacist with this document.

    Four. The following symptoms may appear after taking this medicine. If these symptoms persist or worsen, stop taking this medicine and consult your doctor or pharmacist with this document.
    Constipation, loose stools, diarrhea, dry mouth

  • Stomach pain, heaviness, heartburn, nausea
    (This drug contains an H2 blocker)
    <Precautions related to efficacy/effects>
    Do not take this drug for any symptoms other than those listed in the Efficacy and Effects

  • When symptoms of stomachache, heavy feeling, heartburn, or nausea appear, dissolve the following amount in your mouth and take it, or take it with water or hot water.
    Adult (15 years of age older, under 80 years of age)
    Dosage1 tablet
    Number of doses per dayUp to 2 times
    Child (under 15 years of age)
    Dosage-
    Number of doses per dayPlease do not take.
    Elderly (over 80 years of age)
    Dosage-
    Number of doses per dayPlease do not take.
    <Caution regarding dosage and administration>
    (1) Please strictly follow the usage and dosage instructions.
    (2) This medicine disintegrates easily in the mouth, but it is not absorbed through the mucous membrane of the mouth, so after dissolving it in the mouth, swallow it with saliva or with water or hot water. As with regular tablets, the effect is the same if you take it with water or hot water as it is.
    (3) When taking this medicine, please refrain from drinking alcohol. (Medicines should generally not be taken with alcoholic beverages.)

    [How to take out the tablets]
    Press firmly with your fingertips on the raised part of the PTP sheet containing the tablet to break the aluminum foil on the back, remove the tablet and take it. (If swallowed by mistake, it may cause an unexpected accident such as the tablet piercing the esophageal mucosa.)

    This medicine is not to be taken at a set time, but rather when symptoms appear.
    It is not affected by food, so you can take it before, after, or between meals.
    One tablet at a time controls excess stomach acid for about 8 hours, so if you take it twice a day, make sure to take it at least 8 hours apart.

    [To maintain gastrointestinal health]
    Overeating, drinking too much, consuming excessive amounts of luxury items, skipping meals, etc. can all be detrimental to gastrointestinal health.
    Avoid these types of eating habits.
    Also, be sure to have regular health checkups.

    If symptoms do not subside within 8 hours after taking the medicine, take another tablet.
    If symptoms subside, discontinue use.
    -If symptoms do not improve after taking the medicine for 3 days, stop taking it and consult your doctor or pharmacist.
    ・Do not take this medicine for more than 2 weeks.


    *Please receive instructions from your pharmacist and read the "Cautions for Use" carefully before using this medicine.

  • This drug is a white tablet containing the following ingredients per tablet.
    Famotidine
    Amount10mg
    FunctionControls excess stomach acid.
    [Additives]
    Ethyl cellulose, cetanol, sodium lauryl sulfate, triacetin, cyclodextrin, fragrance, l-menthol, D-mannitol, aspartame (L-phenylalanine compound), candy powder, calcium stearate

  • (1) Store in a cool, dry place away from direct sunlight.
    (2) Please keep out of reach of children.
    (3) Please do not replace it with another container. (This may cause misuse or change in quality)
    (4) Do not use products whose expiration date has passed.

  • GASTER10 S Tablet

    Packaging unit 6 tablets12 tablets
    Manufacturer's suggested retail price (10% tax included) 980円(1,078円)1,580円(1,738円)
    JAN Code 4987 107 6000044987 107 600011
    Individual packaging size Width x Depth x Height (mm) 123x20x60123x24x60
    Packaging unit
    6 tablets / 12 tablets
    Manufacturer's suggested retail price (10% tax included)
    6 tablets 980円(1,078円)
    12 tablets 1,580円(1,738円)
    JAN Code
    6 tablets 4987 107 600004
    12 tablets 4987 107 600011
    Individual package size width x depth x height (mm)
    6 tablets 123x20x60
    12 tablets 123x24x60

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