Do not take this medicine with any of the following medications:
-entacapone
-green tea
-levodopa
-MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
-procarbazine
-ranolazine
-tolcapone

This medicine may also interact with the following medications:
-acetaminophen
-alcohol
-antacids
-medicines for diabetes
-medicines for fungal infections like ketoconazole and itraconazole
-medicines for seizures like carbamazepine, phenobarbital, phenytoin, valproic acid
-theophylline
-zalcitabine

They need to know if you have any of these conditions:
-diabetes
-HIV positive
-if you frequently drink alcohol-containing beverages
-kidney disease
-liver disease
-malnutrition
-tingling of the fingers or toes, or other nerve disorder
-an unusual or allergic reaction to isoniazid, other medicines, foods, dyes or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Visit your doctor or health care professional for regular check ups. You will need blood work done regularly.

You may need to take vitamin supplements while on this medicine. Talk to your doctor about the foods you eat and the vitamins you take. Avoid antacids for 2 hours before and after taking a dose of this medicine.

Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.

If you are diabetic check your blood sugar as directed. Also, you may get a false-positive result for sugar in your urine. Talk with your doctor.

This medicine may cause a decrease in vitamin D and vitamin B6. You should make sure that you get enough vitamins while you are taking this medicine. Discuss the foods you eat and the vitamins you take with your health care professional.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light. Keep container tightly closed. Throw away any unused medicine after the expiration date.