Isoniazid 100 Mg Pharma-Q 100 mg Tablets
PDF Leaflet Revision Date: 29 July 2025
Clinical Summary
Quick overview from the medicine insert
Indication
Prophylaxis and treatment of tuberculosis.
Dosage (summary)
Adults: 100 mg three times daily; 3-5 mg/kg/day in 2+ doses.
Special Populations
- Elderly
- Renal impairment
- Hepatic impairment
Pregnancy & Breastfeeding
Avoid in pregnancy; contraindicated in breastfeeding.
Key Drug Interactions
- Rifampicin
- Carbamazepine
- Phenytoin
- Benzodiazepines
- Warfarin
Contraindications
- Hypersensitivity
- Alcoholism
- Hepatic impairment
- Severe renal failure
- Seizure disorders
Common side effects
- Hepatitis
- Peripheral neuritis
- Nausea
- Vomiting
- Dizziness
Counselling Points
- Take on an empty stomach
- Avoid alcohol
- Report signs of hepatitis
- Consider pyridoxine supplementation
Serious warnings
- Risk of severe hepatotoxicity
- Monitor liver function
- Caution in slow acetylators
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