くすりのしおり

Internal
Published: 5/2016

The information on this sheet is based on approvals granted by the Japanese regulatory authority. Approval details may vary by country. Medicines have adverse reactions (risks) as well as efficacies (benefits). It is important to minimize adverse reactions and maximize efficacy. To obtain a better therapeutic response, patients should understand their medication and cooperate with the treatment.
Brand name :
HYDANTOL Tablets 100mg
 Active ingredient:
Phenytoin
 Dosage form:
white tablet, diameter: 9.0 mm, thickness: 3.5mm
 Print on wrapping:
Hydantol 100 mg, ヒダントール100mg, ヒダントール100, H100

Effects of this medicine

This medicine is considered to suppress generation of action potential by suppressing Na+ channel activity and promote GABA in nerve function.
It is usually used to treat convulsive seizures in epilepsy, autonomic seizures or psychomotor seizures.

Before using this medicine, be sure to tell your doctor and pharmacist

  • If you have previously experienced any allergic reactions (itch, rash, etc.) to any medicines.
    If you have liver/blood disorder, hypothyroidism or diabetes mellitus.
  • If you are pregnant or breastfeeding.
  • 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.)

Dosing schedule (How to take this medicine)

  • Your dosing schedule prescribed by your doctor is ((        to be written by a healthcare professional))
  • In general, for adults, take 200 to 300 mg of the active ingredient a day, in 3 divided doses after each meal. For schoolchildren, take 100 to 300 mg of the active ingredient a day, in 3 divided doses after each meal. For infants, take 50 to 200 mg of the active ingredient a day, in 3 divided doses after each meal. For babies, take 20 to 100 mg of the active ingredient a day, in 3 divided doses after each meal.
    The dosage may be adjusted according to your disease, symptoms/tolerance to this medicine. This medicine contains 100 mg of the active ingredient in a tablet. Strictly follow the instructions.
  • If you miss a dose, take the missed dose when you remember. However, if it is almost time for the next dose, skip the missed dose and follow your regular dosing schedule. You should never take two doses at one time.
  • If you accidentally take more than your prescribed dose, consult with your doctor or pharmacist.
  • Do not stop taking this medicine unless your doctor instructs you to do so.

Precautions while taking this medicine

  • This medicine may cause drowsiness and decreased attention/concentration/reflex movement. Avoid driving a car or operating dangerous machinery.
  • Avoid taking any food containing St. Johns wort with this medicine, since it may diminish medicinal effects.

Possible adverse reactions to this medicine

The most commonly reported adverse reactions include double vision (seeing two images of a single object), shivering of limbs, generalized red rash, gum swelling and excessive hair growth. If any of these symptoms occur, consult with your doctor or pharmacist.
The symptoms described below are rarely seen as initial symptoms of the adverse reactions indicated in brackets. If any of these symptoms occur, stop taking this medicine and see your doctor immediately.
  • fever, bloodshot eyes, generalized skin redness and swelling of the skin with rash or blisters [toxic epidermal necrolysis, mucocutaneous ocular syndrome]
  • rash, fever, swelling in lymph nodes [hypersensitivity syndrome]
  • fever, red rash of the skin, muscle/joint pain [SLE (systemic lupus erythematosus)-like symptoms]
  • anemia, nose or gum bleeding, dizziness [aplastic anemia, blood disorder such as pancytopenia]
  • general malaise, nausea, yellow discoloration of the skin and the white of eyes [fulminant hepatitis, liver dysfunction, jaundice]
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.

Storage conditions and other information

  • Keep out of the reach of children. Store away from direct light and moisture. Store at room temperature (1 to 30 degrees Celsius).
  • Discard the remainder. Do not store them.

For healthcare professional use only : Day Month Year

For further information, talk to your doctor or pharmacist.

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