GASTER10 <Powder>

  • Class 1 Drug
  • Self-medication tax deductible
For stomach discomfort such as stomach pain and nausea. A refreshing powder medicine.
  • H2 Blocker Gastrointestinal Drug
  • Powder
  • 15 to 80 years old
Photo: GASTER10 <Powder> 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 packets 1,078 yen / 12 packets 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 medicine 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 gastric symptoms, and promotes the repair of the stomach lining.
    3. It comes in individual packets that are convenient to carry around.

  • 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 if you fall into any of the following categories:
    (1) Individuals who have experienced allergic reactions (such as rash, redness, itching, or swelling of the throat, eyelids, lips, etc.) to H2 blockers like famotidine, etc.
    (2) Individuals receiving treatment for the following conditions or undergoing medication administration at a medical institution:
    Blood disorders, kidney and liver diseases, heart diseases, stomach and duodenal diseases, immune system disorders such as asthma and rheumatism, steroid medications, antibiotics, anticancer drugs, azole antifungals
    (This may cause leukopenia, thrombocytopenia, etc.)
    (If you have kidney or liver disease, the excretion of the drug may be delayed and potentially causing stronger effects.)
    (If you have heart disease such as myocardial infarction, valvular heart disease, or cardiomyopathy, you may experience irregular heartbeats accompanied by electrocardiogram abnormalities.)
    (Individuals receiving treatment for gastric or duodenal diseases are likely prescribed famotidine or similar medications, so caution is needed to avoid duplicate dosing.)
    (Absorption of azole antifungal agents decreases, reducing their effectiveness.)
    (3) Individuals who have been diagnosed by a doctor that they have blood abnormalities such as low red blood cell count (anemia), low platelet count (difficulty stopping bleeding or prone to bleeding), or low white blood cell count.
    (This drug may become trigger a recurrence of blood disorders.)
    (4) Children (under 15 years of age) and the elderly (80 years of age or older)
    (5) Pregnant women or those who may be pregnant.
    2. Do not take the following medicines while taking this medicine.
    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.

    [Name of symptom] 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.
    4. 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 such as stomach pain, indigestion, heartburn, and nausea appear, take the following dosage with water or hot water.
    Adult (15 years of age older, under 80 years of age)
    Dosage1 packet
    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.
    <Precautions Regarding Dosage and Administration>
    (1) Please strictly follow the usage and dosage instructions.
    (2) Avoid consuming alcoholic beverages while taking this medicine. (Medicines should generally not be taken with alcoholic beverages.)

    This medicine is not taken at a fixed intervals, but only when symptoms appear.
    There is no effect from food, so you may take this medicine before meals, after meals, or between meals.
    One packet controls excess stomach acid for about 8 hours, so if you take it twice a day, please leave an interval of at least 8 hours between doses.

    [To maintain gastrointestinal health]
    Overeating, excessive intake of stimulants (such as alcohol or tobacco), and skipping meals, etc. harm gastrointestinal health.
    Please avoid such dietary habits.
    Also, be sure to have regular health check-ups.

    If symptoms do not subside after more than 8 hours have passed since taking a dose, take one more tablet.
    If the symptoms improve, stop taking this medicine.
    If symptoms do not improve after 3 days of taking this medicine, stop taking it and consult a doctor or pharmacist.
    ・Do not continue taking this medicine for more than 2 weeks.


    *Before using this medicine, please receive instructions from your pharmacist and carefully read the "Precautions for Use".

  • This medicine is in powder form and contains the following ingredients in one package (0.5g).
    Famotidine
    Amount10mg
    FunctionControls excess stomach acid.
    [Additives]
    D-Sorbitol, Hydroxypropylcellulose, l-Menthol, Silica

  • (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 <Powder>

    Packaging unit 6 packets12 packets
    Manufacturer's suggested retail price (10% tax included) 980円(1,078円)1,580円(1,738円)
    JAN Code 4987 774 0371964987 774 037202
    Individual packaging size Width x Depth x Height (mm) 45x31x9267x31x92
    Packaging unit
    6 packets / 12 packets
    Manufacturer's suggested retail price (10% tax included)
    6 packets 980円(1,078円)
    12 packets 1,580円(1,738円)
    JAN Code
    6 packets 4987 774 037196
    12 packets 4987 774 037202
    Individual package size width x depth x height (mm)
    6 packets 45x31x92
    12 packets 67x31x92

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