Generated automatically from the NAFDAC register, WHO alerts and community data as of today. Not medical advice — always follow your doctor or pharmacist.
From the official U.S. FDA label for isoniazid, the active ingredient registered with NAFDAC.
Isoniazid tablets, USP are recommended for all forms of tuberculosis in which organisms are susceptible. However, active tuberculosis must be treated with multiple concomitant anti-tuberculosis medications to prevent the emergence of drug resistance. Single-drug treatment of active tuberculosis with isoniazid or any other medication, is inadequate therapy. Isoniazid tablets, USP are recommended as preventive therapy for the following groups, regardless of age. …
The most frequent reactions are those affecting the nervous system and the liver. Nervous System Reactions Peripheral neuropathy is the most common toxic effect. It is dose-related, occurs most often in the malnourished and in those predisposed to neuritis (e.g., alcoholics and diabetics) and is usually preceded by paresthesias of the feet and hands. The incidence is higher in "slow inactivators". Other neurotoxic effects, which are uncommon with conventional doses, are convulsions, toxic encephalopathy, optic neuritis and atrophy, memory impairment and toxic psychosis. …
Isoniazid is contraindicated in patients who develop severe hypersensitivity reactions, including drug-induced hepatitis; previous isoniazid-associated hepatic injury; severe adverse reactions to isoniazid such as drug fever, chills, arthritis; and acute liver disease of any etiology.
See the boxed warning . Severe Cutaneous Adverse Reactions Severe cutaneous adverse reactions (SCARs) including toxic epidermal necrolysis (TEN), Stevens-Johnson syndrome (SJS), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP) have been reported with the use of isoniazid (see ADVERSE REACTIONS ). Symptoms can be serious and potentially life threatening. If symptoms or signs of SCARs develop, discontinue isoniazid tablets immediately and institute appropriate therapy. …
Pregnancy Teratogenic Effects Pregnancy Category C Isoniazid has been shown to have an embryocidal effect in rats and rabbits when given orally during pregnancy. Isoniazid was not teratogenic in reproduction studies in mice, rats and rabbits. There are no adequate and well-controlled studies in pregnant women. …
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Isoniazid (INH) 300 Tablets contains Isoniazid (300 mg), as tablet, according to its NAFDAC registration record.
Yes. Isoniazid (INH) 300 Tablets is listed on the NAFDAC register under registration number A4-100137, and its registration is active as of 5 November 2026.
No WHO falsified or substandard medical product alert currently matches Isoniazid (INH) 300 Tablets in our automatically synced alert list.
Run a free authenticity scan with the NAFDAC number A4-100137, your pack's expiry date and batch number to get a Trust Score, compare the pack with the NAFDAC record (ingredient, strength, form, manufacturer), and buy only from licensed pharmacies.
Isoniazid tablets, USP are recommended for all forms of tuberculosis in which organisms are susceptible. However, active tuberculosis must be treated with multiple concomitant anti-tuberculosis medications to prevent the emergence of drug resistance. Single-drug treatment of active tuberculosis with isoniazid or any other medication, is inadequate therapy. Isoniazid tablets, USP are recommended as (Summarised from the official U.S. FDA label for isoniazid. Always follow your doctor or pharmacist.)
Reviews are personal experiences from RxVerify users, not medical advice. Report side effects to your doctor and to NAFDAC.