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isoniazid (cont.)

What should I discuss with my healthcare provider before taking isoniazid ()?

Before taking this medication, tell your doctor if you have

  • ever had an allergic reaction to isoniazid,
  • kidney disease, or
  • liver disease.

You may not be able to take isoniazid, or you may require a dosage adjustment or special monitoring during treatment if you have any of the conditions listed above.

It is not known whether isoniazid will be harmful to an unborn baby. Do not take this medication without first talking to your doctor if you are pregnant or could become pregnant during treatment.

It is not known whether isoniazid will be harmful to a nursing baby. Do not take this medication without first talking to your doctor if you are breast-feeding a baby.

How should I take isoniazid ()?

Take isoniazid exactly as directed by your doctor. If you do not understand these instructions, ask your pharmacist, nurse, or doctor to explain them to you.

Take each dose with a full glass (8 ounces) of water.

Take isoniazid on an empty stomach 1 hour before or 2 hours after meals.

If nausea occurs, ask your doctor if you can take isoniazid with food.

Take all of the isoniazid that has been prescribed for you even if you begin to feel better. Your symptoms may begin to improve before the infection is completely treated.

It is important to take isoniazid regularly to get the most benefit.

Your doctor may also want you to take a supplemental vitamin B6 (pyridoxine) tablet daily during treatment to prevent numbness and tingling caused by low levels of this vitamin.

Your doctor may want you to have blood tests or other medical evaluations during treatment with isoniazid to monitor progress and side effects.

Store this medication at room temperature away from moisture and heat.

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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