ISONIAZID; RIFAMPIN (eye soe NYE a zid; RIF am pin) is a combination of two antibiotics. It is used to treat tuberculosis (TB). It will not work for colds, flu, or other viral infections.
Take this medicine by mouth with a full glass of water. Follow the directions on the prescription label. Take this medicine on an empty stomach, either 1 hour before or 2 hours after food. Take your medicine at regular intervals. Do not take your medicine more often than directed. Take all of your medicine as directed even if you think you are better. Do not skip doses or stop your medicine early. Skipping doses may make the TB resistant to this medicine and other medicines. Do not stop taking except on your doctor's advice.
Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.
Side effects that you should report to your doctor or health care professional as soon as possible:
allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
changes in vision or eye pain
feeling faint or lightheaded, falls
fever or chills, sore throat
hallucination, loss of contact with reality
loss of appetite
pain, tingling, numbness in the hands or feet
pinpoint red spots on the skin
redness, blistering, peeling or loosening of the skin, including inside the mouth
trouble passing urine or change in the amount of urine
unusual bleeding, bruising
unusually weak or tired
yellowing of the eyes or skin
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
breast enlargement or tenderness
Do not take this medicine with any of the following medications:
certain antiviral medicines for HIV or AIDS
MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
This medicine may also interact with the following medications:
barbiturates like phenobarbital
beta-blockers like metoprolol and propranolol
calcium channel blockers like diltiazem, nifedipine and verapamil
certain antibiotics like ciprofloxacin
certain medicines for depression, anxiety, or psychotic disturbances
certain medicines for diabetes, like glipizide or glyburide
certain medicines for fungal infections like fluconazole, ketoconazole and itraconazole
certain medicines for irregular heart beat like disopyramide, mexiletine, quinidine
certain medicines for seizures like carbamazepine, phenobarbital, phenytoin, valproic acid
certain medicines for sleep
certain medicines that treat or prevent blood clots like warfarin
female hormones, like estrogens or progestins and birth control pills, patches, rings, or injections
narcotic medicines for pain
steroid medicines like prednisone or cortisone
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
Keep out of the reach of children.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.
They need to know if you have any of these conditions:
HIV or AIDS
if you often drink alcohol
tingling of the fingers or toes, or other nerve disorder
wear contact lenses
an unusual or allergic reaction to isoniazid, rifampin, rifabutin, other medicines, foods, dyes or preservatives
pregnant or trying to get pregnant
Tell your doctor or healthcare professional if your symptoms do not start to get better or if they get worse.
Do not treat diarrhea with over the counter products. Contact your doctor if you have diarrhea that lasts more than 2 days or if it is severe and watery.
This medicine can color your teeth, urine, sweat, tears, and mucous. The color may stain your teeth for good. The color in tears may also stain soft contact lenses for good. If you wear contact lenses, ask your doctor or health care professional when you can use your lenses again.
You may need blood work done while you are taking this medicine.
Birth control pills may not work properly while you are taking this medicine. Talk to your doctor about using an extra method of birth control.