Rifadin

DRUG DESCRIPTION

RIFATER (rifampin/isoniazid/pyrazinamide) tablets are combination tablets containing 120 mg rifampin, 50 mg isoniazid, and 300 mg pyrazinamide for use in antibacterial therapy. The tablets also contain as inactive ingredients: povidone, carboxymethylcellulose sodium, calcium stearate, sodium lauryl sulfate, sucrose, talc, acacia, titanium dioxide, kaolin, magnesium carbonate, colloidal silicon dioxide, dried aluminum hydroxide gel, ferric oxide, black iron oxide, carnauba wax, white beeswax, colophony, hard paraffin, lecithin, shellac, and propylene glycol. The RIFATER triple therapy combination was developed for dosing convenience.

Rifampin

Rifampin is a semisynthetic antibiotic derivative of rifamycin SV. Rifampin is a red-brown crystalline powder very slightly soluble in water at neutral pH, freely soluble in chloroform, soluble in ethyl acetate and methanol. Its molecular weight is 822.95 and its chemical formula is C43H5gN4Oi2. The chemical name for rifampin is either:

3 - [ [(4-methyl-1 -piperazinyl) imino] -methyl] -rifamycin; or 5,6,9,17,19,21 -hexahydroxy-23methoxy-2,4,12,16,18,20,22 heptamethyl-8-[N-(4-methyl-l-piperazinyl)formimidoyl]-2,7-(epoxypentadeca [1,1 l,13]trienimino)naphtho[2,l-b]furan-l, 1 l(2H)-dione 21-acetate. Its structural formula is:

Rifampin Structural Formula Illustration

Isoniazid

Isoniazid is the hydrazide of isonicotinic acid. It is a colorless or white crystalline powder or white crystals. It is odorless and slowly affected by exposure to air and light. It is freely soluble in water, sparingly soluble in alcohol and slightly soluble in chloroform and in ether. Its molecular weight is 137.14 and its chemical formula is C6H7N3O.

The chemical name for isoniazid is 4-pyridinecarboxylic acid, hydrazide and its structural formula is:

Pyrazinamide

Pyrazinamide, the pyrazine analogue of nicotinamide, is a white, crystalline powder, stable at room temperature, and sparingly soluble in water. The chemical name for pyrazinamide is pyrazinecarboxamide and its molecular weight is 123.11. Its chemical formula is C5H5N3O and its structural formula is:

What are the possible side effects of rifampin (Rifadin)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • fever, chills, body aches, flu symptoms;
  • joint pain or swelling;
  • easy bruising or bleeding, weakness;
  • urinating less than usual or not at all; or
  • nausea, stomach pain, loss of appetite, itching, dark urine, clay-colored stools, jaundice (yellowing of the...

Read All Potential Side Effects and See Pictures of Rifadin

What are the precautions when taking rifampin (Rifadin)?

Before taking rifampin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: diabetes, liver problems (e.g., hepatitis), HIV infection, history of alcohol use/abuse.

This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

Before having surgery, tell your doctor or dentist that you are using this drug.

During pregnancy, this medication should...

Read All Potential Precautions of Rifadin


Rifadin Consumer (continued)

SIDE EFFECTS: This drug may cause upset stomach, heartburn, nausea, menstrual changes, headache, drowsiness, or dizziness. If any of these effects persist or worsen, inform your doctor promptly.

This medication may produce a harmless, reddish coloration of urine, sweat, saliva, or tears. Soft contact lenses may be permanently stained.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Rifampin may infrequently cause serious liver disease. Though sometimes necessary to completely treat certain infections, combination treatment with other drugs (e.g., isoniazid, pyrazinamide) may increase this risk. Tell your doctor immediately if any of these unlikely but serious side effects occur: flu-like symptoms (fever, chills, headache, muscle aches), change in amount of urine, persistent nausea/vomiting, stomach/abdominal pain, dark urine, yellowing eyes/skin, mental/mood changes (e.g., confusion, unusual behavior), unusual tiredness, easy bruising/bleeding, small red spots on the skin, joint pain/swelling.

This medication may rarely cause a severe intestinal condition (Clostridium difficile-associated diarrhea) due to a type of resistant bacteria. This condition may occur during treatment or weeks to months after treatment has stopped. Do not use anti-diarrhea products or narcotic pain medications if you have any of the following symptoms because these products may make them worse. Tell your doctor immediately if you develop: persistent diarrhea, abdominal or stomach pain/cramping, blood/mucus in your stool.

Use of this medication for prolonged or repeated periods may result in oral thrush or a new yeast infection (oral/vaginal fungal infection). Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge, or other new symptoms.

In the unlikely event you have an allergic reaction to this drug, seek immediate medical attention. Symptoms of an allergic reaction include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before taking rifampin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: diabetes, liver problems (e.g., hepatitis), HIV infection, history of alcohol use/abuse.

This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

Before having surgery, tell your doctor or dentist that you are using this drug.

During pregnancy, this medication should be used only when clearly needed. When this drug is taken during the last few weeks of pregnancy, the risk of bleeding in both mother and infant may be increased. Tell your doctor immediately if you notice any bleeding in your newborn. Discuss the risks and benefits with your doctor.

Rifampin passes into breast milk. Consult your doctor before breast-feeding.


Rifadin Patient Information Including Side Effects

Brand Names: Rifadin

Generic Name: rifampin (Pronunciation: rif AM pin)

  • What is rifampin (Rifadin)?
  • What are the possible side effects of rifampin (Rifadin)?
  • What is the most important information I should know about rifampin (Rifadin)?
  • What should I discuss with my healthcare provider before using rifampin (Rifadin)?
  • How should I use rifampin (Rifadin)?
  • What happens if I miss a dose (Rifadin)?
  • What happens if I overdose (Rifadin)?
  • What should I avoid while taking rifampin (Rifadin)?
  • What other drugs will affect rifampin (Rifadin)?
  • Where can I get more information?

What is rifampin (Rifadin)?

Rifampin is an antibiotic. Rifampin prevents bacteria from spreading in your body.

Rifampin is used to treat or prevent tuberculosis (TB).

Rifampin may also be used to eliminate a bacteria from your nose and throat that may cause meningitis or other infections, even if you do not have an infection. Rifampin prevents you from spreading this bacteria to other people, but the medication will not treat an infection caused by the bacteria.

Rifampin may also be used for other purposes not listed in this medication guide.

What are the possible side effects of rifampin (Rifadin)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • fever, chills, body aches, flu symptoms;
  • joint pain or swelling;
  • easy bruising or bleeding, weakness;
  • urinating less than usual or not at all; or
  • nausea, stomach pain, loss of appetite, itching, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Less serious side effects may include:

  • tired feeling; or
  • red or orange colored urine, stools, tears, sweat, or saliva.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about rifampin (Rifadin)?

Before taking rifampin, tell your doctor if you are allergic to any drugs, or if you have liver disease or porphyria ( (a genetic enzyme disorder that causes symptoms affecting the skin or nervous system).

Take this medication for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Rifampin will not treat a viral infection such as the common cold or flu.

Take the rifampin capsule on an empty stomach 1 hour before or 2 hours after a meal.

Rifampin can make birth control pills less effective. Ask your doctor about using a non-hormone method of birth control (such as a condom, diaphragm, spermicide) to prevent pregnancy while taking rifampin.

There are many other medicines that can interact with rifampin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.

Do not wear contact lenses while you are taking rifampin. This medicine may discolor your tears, which could permanently stain soft contact lenses.

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