Product image of Mycobutin (Rifabutin) supplied by GNH India

Mycobutin

Active Ingredient:
Rifabutin
Origin:
EU

Mycobutin (Rifabutin)

Rifabutin, the active ingredient in Mycobutin, is a rifamycin antibiotic presented as an unknown strength/oral tablet for oral use. It treats Mycobacterium avium complex infections and tuberculosis in adult patients.
GNH India supplies Mycobutin as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Pfizer Healthcare Ireland Unlimited Company

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Indications & Clinical Uses

Rifabutin is a rifamycin antibiotic used in the management of mycobacterial infections.

  • Mycobacterium avium complex (MAC) infection: prophylaxis and treatment in immunocompromised adults.
  • Tuberculosis (TB): component of combination therapy for active disease, including drug‑resistant strains.
  • HIV‑associated MAC disease: prevention in patients with low CD4 counts.

How It Works

  • Rifabutin binds to the β‑subunit of bacterial DNA‑dependent RNA polymerase, blocking the initiation of RNA synthesis. This inhibition suppresses transcription of essential genes, halting bacterial replication and leading to cell death in susceptible mycobacterial species.

Side Effects

Rifabutin may cause a range of adverse reactions, from mild to severe.

Common Side Effects

  • Nausea: mild gastrointestinal upset.
  • Diarrhea: loose stools, often transient.
  • Rash: skin redness or itching.
  • Fever: low‑grade temperature elevation.
  • Abdominal pain: discomfort in the stomach area.
  • Elevated liver enzymes: mild hepatic enzyme rise.

Serious or Rare Side Effects

  • Hepatotoxicity: significant liver injury requiring monitoring.
  • Neutropenia: marked reduction in white blood cells.
  • Severe skin reactions: Stevens‑Johnson syndrome or toxic epidermal necrolysis.
  • Visual disturbances: blurred vision or color changes.
  • Hypersensitivity: anaphylactic reactions.
  • Peripheral neuropathy: tingling or numbness in extremities.

Precautions & Warnings

Before initiating Rifabutin therapy, consider the following safety measures.

  • Liver function: assess baseline hepatic enzymes and monitor periodically.
  • Blood counts: check complete blood count to detect neutropenia or anemia.
  • Drug interactions: review concomitant medications for CYP3A inducers or inhibitors.
  • Pregnancy and lactation: evaluate risk‑benefit ratio; use only if clearly needed.
  • Renal impairment: adjust monitoring in patients with reduced kidney function.
  • Store at ambient temperature: keep below 25 °C, retain in original packaging, protect from moisture.

Avoid Interactions

Rifabutin interacts with several drug classes; awareness helps avoid reduced efficacy or toxicity.

Major Interactions (Avoid)

  • Strong CYP3A inducers (e.g., rifampicin, carbamazepine): markedly lower Rifabutin levels.
  • Antiretrovirals (e.g., protease inhibitors boosted with ritonavir): increase Rifabutin exposure, risk of toxicity.

Moderate Interactions (Monitor Closely)

  • Macrolide antibiotics (e.g., azithromycin, clarithromycin): may raise Rifabutin concentrations.
  • Warfarin: potential enhancement of anticoagulant effect.
  • Fluoroquinolones: additive risk of tendon disorders.
  • Oral contraceptives: reduced hormonal efficacy, consider backup contraception.
  • Antifungals (e.g., fluconazole): may increase Rifabutin levels modestly.

Frequently Asked Questions

Mycobutin, containing Rifabutin, is prescribed for the prevention and treatment of Mycobacterium avium complex (MAC) infections, for active tuberculosis (including drug‑resistant strains) as part of combination therapy, and for prophylaxis of MAC disease in HIV‑positive patients with low CD4 counts.

Rifabutin inhibits the bacterial DNA‑dependent RNA polymerase by binding to its β‑subunit. This blocks transcription of essential genes, halting protein synthesis and bacterial replication, which leads to the death of susceptible mycobacteria.

The specific dose of Mycobutin is determined by the prescribing clinician based on the patient’s condition, weight, renal and hepatic function, and any concomitant medications. Dosage regimens are individualized and should follow local treatment guidelines.

Safety data for Rifabutin in pregnancy and lactation are limited. It should only be used when the potential benefit justifies any potential risk to the fetus or infant, and the decision must be made by the treating physician after a thorough risk‑benefit assessment.

To place an order, submit an enquiry on the product page at gnhindia.com, specifying the required quantity. GNH India works with hospitals, pharmacies, and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details (including any cold‑chain requirements), and necessary import documentation.

Rifabutin shares a similar mechanism with other rifamycins such as Rifampicin but has a longer half‑life and fewer drug‑inducing effects on cytochrome P450 enzymes. This can result in fewer interactions, making it a preferred option for patients on complex antiretroviral regimens, though individual suitability depends on clinical context.

Mycobutin should be stored at ambient temperature, preferably below 25 °C. Keep the tablets in the original container, protect them from moisture and direct sunlight, and ensure the packaging remains tightly closed until use.

Mycobutin is taken orally, usually with food to improve tolerability. The tablet should be swallowed whole with a full glass of water and not chewed or crushed, unless otherwise directed by a healthcare professional.

Serious adverse reactions can include hepatotoxicity, severe neutropenia, hypersensitivity reactions such as Stevens‑Johnson syndrome, and visual disturbances. Patients should be monitored regularly for liver function, blood counts, and any signs of allergic or ocular symptoms.

Mycobutin is contraindicated in individuals with known hypersensitivity to Rifabutin or any rifamycin class, and in patients with severe liver disease where the drug may exacerbate hepatic injury. It should also be avoided in those taking strong CYP3A inducers without appropriate dose adjustments.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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