It is very important that your doctor check your or your child's progress at regular visits. Blood and urine tests may be needed to check for unwanted effects.
You should not use this medicine if you are also receiving certain medicines to treat HIV infection (eg, atazanavir, darunavir, fosamprenavir, ritonavir, saquinavir, tipranavir, Aptivus®, Fortovase®, Invirase®, Lexiva®, Norvir®, Prezista®, or Reyataz®).
Do not use this medicine together with praziquantel. If you need to take praziquantel, you should stop using rifampin 4 weeks before starting praziquantel. You may restart rifampin one day after the last dose of praziquantel.
Liver problems may be more likely to occur if you drink alcoholic beverages regularly while you are using this medicine. Also, the regular use of alcohol may keep this medicine from working properly. Therefore, you should strictly limit the amount of alcoholic beverages you drink while you are using this medicine.
Check with your doctor right away if you have fever, chills, cough, sore throat, swollen, painful, or tender lymph glands in the neck, armpit, or groin, or yellow skin or eyes while using this medicine. These could be symptoms of a serious condition called drug reaction with eosinophilia and systemic symptoms (DRESS).
Check with your doctor right away if you or your child have pain or tenderness in the upper stomach, pale stools, dark urine, loss of appetite, nausea, unusual tiredness or weakness, or yellow eyes or skin. These could be symptoms of a serious liver problem.
Serious skin reactions can occur with this medicine. Check with your doctor right away if you have blistering, peeling, or loosening of the skin, red skin lesions, severe acne or a skin rash, sores or ulcers on the skin, or fever or chills with this medicine.
This medicine may cause blood clotting problems, which may lead to bleeding. Check with your doctor right away if you cough up blood, have bleeding gums, difficulty in breathing or swallowing, dizziness, headache, increased menstrual flow or vaginal bleeding, nosebleeds, prolonged bleeding from cuts, red or dark brown urine, or red or black, tarry stools after using this medicine.
Rifampin will cause urine, saliva, sputum, sweat, teeth, and tears to turn a reddish-orange to reddish-brown color. This is to be expected while you are using this medicine. This effect may also cause soft contact lenses to become permanently discolored. Standard cleaning solutions may not take out all the discoloration. Therefore, it is best not to wear soft contact lenses while using this medicine. Hard contact lenses are not discolored by this medicine. This condition will return to normal once you stop using this medicine. If you have any questions about this, check with your doctor.
If you develop a skin rash, hives, or any allergic reaction to this medicine, check with your doctor right away.
Birth control pills may not work properly while you are using this medicine. To keep from getting pregnant, use another form of birth control together with your birth control pills. Other forms include condoms, diaphragms, or contraceptive foams or jellies.
Before you have any medical tests, tell the doctor in charge that you or your child are using this medicine. The results of some tests may be affected by this medicine.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.