Astellas Pharama Inc.
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The information on this sheet is based on approvals granted by the Japanese regulatory authority. Approval details may vary by country. Medicines have adverse effects (risks) as well as efficacies (benefits). It is important to minimize adverse effects and maximize efficacy. To obtain a better therapeutic response, patients should understand their medication and cooperate with the treatment.
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Brand name :
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Gaster Powder 2%
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Dosage form:
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white powder
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Effects of this medicine
This medicine blocks the histamine 2 receptors on the gastric mucosa, thus suppressing the secretion of stomach acid.
It is usually used in the treatment of gastric ulcer, duodenal ulcer, gastritis and esophagitis.
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Before using this medicine, be sure to tell your doctor and pharmacist
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If you ever experienced any allergic reaction (itch, rash etc.) to any medicine.
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If you are pregnant or breastfeeding.
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If you are taking any other medicinal products. (Some medicines may interact to enhance or diminish medicinal effects. Beware of over-the-counter medicines and dietary supplements as well as other prescription medicines.)
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Dosing schedule (How to take this medicine)
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Your dosing schedule prescribed by your doctor is << to be written by a healthcare professional>>
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General dosage regimen: For the treatment of gastric ulcer, duodenal ulcer, anastomotic ulcer, upper gastrointestinal hemorrhage, reflux esophagitis, and Zollinger-Ellison syndrome, for adults, take 1g (20mg of the active ingredient) at a time, twice daily (after breakfast, and after supper or before going to bed). You may also take 2g (40mg) at a time, once daily (before going to bed).
For the treatment of gastric mucosal lesions associated with acute gastritis and acute exacerbation of chronic gastritis, for adults, take 0.5g (10mg) at a time, twice daily (after breakfast, and after supper or before going to bed). You may also take 1g (20mg) at a time, once daily (before going to bed).
The dosage may be adjusted according to your disease, age or symptoms. Strictly follow the instructions of your doctor/pharmacist.
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If you have missed a dose, skip the missed dose and continue your regular dosing schedule. DO NOT take double doses to make up for the missed dose.
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If you took too much of the medicine (more than ordered), check with your doctor/pharmacist.
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Do not stop taking the medicine without the instructions of your doctor.
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Precautions while taking this medicine
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Possible adverse effects of this medicine
Common side effects are reported as below. If any of them occurs, check with your doctor/pharmacist: rash/eruption, urticaria, facial oedema, constipation, irregular menstruation, gynaecomastia, etc.
The symptoms described below are rarely seen as initial symptoms of the adverse effects indicated in brackets. If any of these symptoms occur, stop taking this medicine and see your doctor immediately.
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facial pallor, cold sweat, dizziness on standing up [shock, anaphylactoid reactions]
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sore throat, headache, muscle pain, symptoms of anemia, bleeding tendency [aplastic anemia, pancytopenia, agranulocytosis, haemolytic anemia, thrombocytopenia]
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fever, loss of appetite, red rash [mucocutaneo-ocular syndrome, toxic epidermal necrolysis]
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general malaise, loss of appetite, yellowing of the skin and the whites of the eye [hepatic function disorder, jaundice]
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muscle pain, feelings of weakness, brown urine [rhabdomyolysis]
The above symptoms do not describe all the adverse reactions to this medicine. Consult with your doctor or pharmacist if you notice any symptoms of concern other than those listed above.
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Storage conditions and other information
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Keep out of the reach of infants and children. Store away from direct sunlight, heat and humidity.
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Discard the remainder. Do not store them.
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