afb 4 kit - Isoniazid (300mg) + Rifampicin (450mg) medicine

afb 4 kit - Uses, Price, Side Effects & Substitutes

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๐Ÿญ Lark Laboratories Ltd ๐Ÿ“ฆ Varies by brand ๐Ÿ’Š Allopathy ๐Ÿ“… Updated: Jun 29, 2026
โš ๏ธ Hepatotoxicity Risk ๐Ÿ“‹ Prescription Required ๐Ÿ’Š Generic Available
Medically Reviewed
SaathiMed Expert Panel | Jun 29, 2026

What is afb 4 kit used for?

AKT 4 Kit (Isoniazid + Rifampicin) is used to treat ANTI INFECTIVES. It contains Isoniazid (300mg) + Rifampicin (450mg), which Isoniazid inhibits mycolic acid synthesis; Rifampicin inhibits DNA-dependent RNA. Always consult your doctor before use. Take as prescribed.

  • Generic Name: Isoniazid + Rifampicin
  • Manufacturer: Lark Laboratories Ltd
  • Form: Allopathy
  • Pregnancy Category: C
  • Prescription Required: Yes
๐Ÿ’ก Did You Know? The first generic medicine was introduced in India in 1970 after the Patents Act was amended.

๐Ÿ’Š afb 4 kit Uses & Benefits

Tuberculosis (first-line treatment).

Off-label uses: Leprosy (rifampicin), atypical mycobacterial infections.

๐Ÿ“‹ Drug Information

Generic Name(s)Isoniazid + Rifampicin
Brand NameAKT 4 Kit
ManufacturerLark Laboratories Ltd
Packaging / FormVaries by brand (Allopathy)
Therapeutic ClassANTI INFECTIVES
Action ClassAntimycobacterials
Route of AdministrationOral
StorageStore at 25ยฐC (77ยฐF); protect from light and moisture.
Shelf LifeAs per manufacturer

๐Ÿ”ฌ Pharmacology (PK/PD)

Pharmacokinetics

AbsorptionIsoniazid: Rapidly and completely absorbed orally; Rifampicin: Well absorbed orally, absorption reduced by food.
DistributionIsoniazid: Widely distributed, crosses placenta and enters CSF; Rifampicin: Widely distributed, high concentrations in liver, lungs, and CSF.
Protein BindingIsoniazid: 0-10%; Rifampicin: 80-90%
MetabolismIsoniazid: Hepatic via N-acetyltransferase (polymorphic); Rifampicin: Hepatic, induces CYP450 enzymes.
Half-LifeIsoniazid: 1-4 hours (fast acetylators), 2-5 hours (slow acetylators); Rifampicin: 2-5 hours.
ExcretionIsoniazid: Renal (75-95% as metabolites); Rifampicin: Biliary (60-65%) and renal (30%).
BioavailabilityIsoniazid: ~90%; Rifampicin: ~90%
Onset of ActionIsoniazid: 1-2 hours; Rifampicin: 2-4 hours
Peak Plasma TimeIsoniazid: 1-2 hours; Rifampicin: 2-4 hours
Duration of ActionIsoniazid: 12-24 hours; Rifampicin: 12-24 hours

How It Works

Isoniazid inhibits mycolic acid synthesis; Rifampicin inhibits DNA-dependent RNA polymerase.

Mechanism Steps

1Isoniazid enters mycobacteria and is activated by KatG catalase-peroxidase.
2Activated isoniazid inhibits InhA, blocking mycolic acid synthesis.
3Rifampicin binds to RNA polymerase beta subunit, inhibiting transcription.

๐Ÿ’ก How to Take afb 4 kit

Follow your doctor's prescription exactly.

โš ๏ธ Side Effects of afb 4 kit

โœ… Common Side Effects

  • Nausea
  • Vomiting
  • Hepatotoxicity
  • Rash
  • Peripheral neuropathy (isoniazid)

๐Ÿšจ Serious Side Effects

  • Hepatitis
  • Thrombocytopenia
  • Hemolytic anemia
  • Renal failure

โš ๏ธ Rare Side Effects

  • Gynecomastia
  • Psychosis
  • Seizures
  • Lupus-like syndrome

Consult your doctor if you experience any unusual symptoms.

๐Ÿ”ฌ Drug Interactions

โš ๏ธ DrugSeverityEffect
Warfarin Major Reduced anticoagulant effect due to CYP induction.
Oral contraceptives Major Reduced contraceptive efficacy.
Phenytoin Major Decreased phenytoin levels.
Theophylline Major Decreased theophylline levels.
Ketoconazole Major Reduced antifungal levels.
Antacids Moderate Reduced isoniazid absorption.
Corticosteroids Moderate Reduced corticosteroid efficacy.
Oral hypoglycemics Moderate Reduced hypoglycemic effect.
Digoxin Moderate Reduced digoxin levels.
Alcohol Minor Increased hepatotoxicity risk.
Acetaminophen Minor Increased hepatotoxicity risk.

๐Ÿšจ Major Interactions

  • Warfarin
  • Oral contraceptives
  • Phenytoin
  • Theophylline
  • Ketoconazole

โšก Moderate Interactions

  • Antacids
  • Corticosteroids
  • Oral hypoglycemics
  • Digoxin

โ„น๏ธ Minor Interactions

  • Alcohol
  • Acetaminophen

๐Ÿฝ๏ธ Food Interactions

Food reduces absorption of rifampicin; take on empty stomach.

๐Ÿท Alcohol Interaction

Increased risk of hepatotoxicity; avoid alcohol.

๐Ÿ›ก๏ธ Safety & Warnings

๐Ÿšซ Contraindications

Hypersensitivity, acute liver disease, history of drug-induced hepatitis.

๐Ÿ“Š Monitoring Parameters

Liver function tests, sputum culture, chest X-ray.

๐Ÿคฑ Lactation Safety

Excreted in milk; use with caution.

๐Ÿ’Š Overdose Management

Gastric lavage, activated charcoal, supportive care; monitor liver function.

โฐ Missed Dose

Take as soon as remembered; if near next dose, skip missed dose.

๐Ÿ‘จโ€โš•๏ธ Reviewed by Expert

SaathiMed Expert Panel

MD, PhD - Pharmacology

Reviewed: Jun 29, 2026

๐Ÿ”— View Profile

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