From $1.73 per tablet or capsule.
Source: U.S. NADAC (what pharmacies pay, government data), 17 Jun 2026. What you pay at the counter can be higher (pharmacy fees, insurance).
Prices in other countries are not what you will pay where you live; they show how prices compare.
In United States, Isoniazid costs from $1.73 per tablet or capsule (U.S. NADAC (what pharmacies pay, government data)).
Ask the pharmacist for a generic version with the same active ingredient and strength: it works the same and usually costs much less. Compare a few licensed pharmacies, and never buy medicine from unlicensed sellers to save money.
Check the registration number on the pack with PillVera, look at the expiry date, and buy from a licensed or verified pharmacy. A price far below everyone else's is a warning sign.