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Moderate· moderate-evidence
May be possible under supervision — talk to your prescriber or pharmacist before combining.
Garlic may reduce isoniazid absorption and blood levels, potentially reducing its effectiveness for tuberculosis treatment.
Garlic may reduce gastrointestinal absorption of isoniazid.
Source: Clinical Studies · Reviewed April 2026
Garlic + Isoniazid: use caution. May be possible under supervision — talk to your prescriber or pharmacist before combining. Garlic may reduce isoniazid absorption and blood levels, potentially reducing its effectiveness for tuberculosis treatment.
Garlic may reduce gastrointestinal absorption of isoniazid.
Do not stop either abruptly on your own. Talk to your prescriber or pharmacist promptly — bring this page to your appointment.
Educational information only — not medical advice. Always verify with a healthcare professional.