Isoniazid Tablet

Isoniazid is used in combination with other drugs for the treatment and prevention of tuberculosis.

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​What is this medication used for​​

Isoniazid is used in combination with other drugs for the treatment and prevention of tuberculosis.


Dosage and How to Use​​

When should the medication be taken?​​

  • ​Isoniazid is usually taken daily. Follow the instructions on the label carefully and approach the pharmacist or doctor if clarification is needed.
  • Do not stop taking this medicine unless instructed by the doctor. Stopping this medicine can worsen the infection or result in resistance.

How should it be taken?

​Isoniazid comes in the form of tablets. It may be swallowed whole with a glass of water 1 hour before or 2 hours after a meal. It may be swallowed whole or made into a mixture with water before taking.

Missed a ​Dose​

  • ​Take the dose as soon as it is remembered and then continue to take it as one normally would. However, if it is almost time for the next dose, skip the dose that is missed and administer the next dose at the usual time.
  • ​Do not double or increase the dose.

Side Effects, Precautions, Contraindication​​

What side effects can this medicine cause? What can be done about them​?

Isoniazid may cause some unwanted side effects. Generally, the common side effects tend to occur at the beginning of the treatment. Such side effects include:

  • If the medicine upsets the stomach, take the medicine with food
  • Agitation, fatigue, dizziness
  • Change in eye sight, eye pain or irritation

Inform the doctor if any of the above side effects lasts for more than a few days or if they become serious or bothersome.

Rare but serious effects may sometimes occur. Contact the doctor as soon as possible if any of the following are noticed:

  • Fatigue, weakness, nausea, vomiting
  • Dark urine, or yellowing of the eyes or skin
  • Burning, tingling, or numbness in the extremities.
  • Skin rash
Inform the doctor if any other unusual symptoms were noticed.

Special Instructions​​

Check with the doctor or pharmacist if any other medication, supplements or herbal products is to be given to the child. If another doctor is to be seen, he/she has to be informed that isoniazid is being taken before he/she prescribes any other medication.

​​

Handling and Storage​​​

For the tablets, store in a cool, dry place (room temperature), away from light

​​​​​

This leaflet answers some common questions about Isoniazid. It does not contain all the available information. It also does not take the place of talking to the doctor or pharmacist.

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Version 1
Last Review: July 2017
Produced by Department of Pharmacy
KK Women’s and Children’s Hospital​

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Isoniazid Tablet

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