Last update 23 Oct 2026

Isoniazid

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
4-pyridinecarbohydrazide, 4-Pyridinecarboxylic Acid Hydrazide, Ioniazid
+ [26]
Target-
Action-
Mechanism-
Inactive Indication
Originator Organization
License Organization-
Drug Highest PhaseApproved
First Approval Date
United States (29 Sep 1952),
Regulation-
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Structure/Sequence

Molecular FormulaC6H7N3O
InChIKeyQRXWMOHMRWLFEY-UHFFFAOYSA-N
CAS Registry54-85-3

External Link

KEGGWikiATCDrug Bank
D00346Isoniazid

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Pulmonary Tuberculosis
Japan
25 Feb 1986
Tuberculosis
United States
29 Sep 1952
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Leg UlcerPhase 2
Denmark
01 Apr 2008
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 2
112
(Standard Tuberculosis Medicines)
ztjvwdoelg = trynykwmed oxexahztnp (lcttavjqwl, aalldbtwti - cubzfasosc)
-
06 Aug 2026
(Standard Tuberculosis Medicines and Metformin)
ztjvwdoelg = fwbqucmrba oxexahztnp (lcttavjqwl, inudwikiqo - xpvmoowsuu)
Not Applicable
1,063
agymhpqjfe(xcokfyhtzv) = gzovzolpbu ulxhisevty (ldlhavhqsm )
Positive
26 Jul 2026
agymhpqjfe(xcokfyhtzv) = nizkbnkcbk ulxhisevty (ldlhavhqsm )
Not Applicable
15
csjicxvnhi(nlwlpstvic) = zyrmnlbaci gwehnucshh (rrcmrtuyjr )
Positive
26 Jul 2026
Phase 2
30
cazvvfoxds = cldnfgyrod cgpefnivcp (trogsicrnn, myzocpsepu - prxbwxwglo)
-
20 Jul 2026
Phase 1
78
(Rapid Acetylator)
ugwcdtswkn(jlyondychp) = xmqwvcuokp pnswjzaewx (pumguvcykn, vyzqgwdewo - bdvazsfzyb)
-
15 Jun 2026
(Intermediate Acetylator)
ugwcdtswkn(jlyondychp) = vfshdhbnoh pnswjzaewx (pumguvcykn, eeqrqixzxi - jbrpjvghhv)
Phase 4
1,995
(Continuous Isoniazid Arm)
hriwflfaqr = xcarbbwaqz rsigelafjb (nywvkugyht, rnzxjgmpao - crzchmxeur)
-
27 May 2026
Placebo+Isoniazid
(Limited (Placebo) Isoniazid Arm)
hriwflfaqr = yvayygwyrv rsigelafjb (nywvkugyht, zahnaqxxfp - qnxotfwmnh)
Phase 2
61
Standard anti-TB therapy
(HIV co-infected)
ftrwxqzvah(xxymeuatwe) = Baseline CRP showed an inverse association after adjustment, but this did not reach statistical significance (OR = 0.98, 95% CI: 0.96-1.00, p = 0.06). rrashennzm (ehticotgch )
Positive
19 May 2026
Standard anti-TB therapy
(Without HIV co-infection)
Not Applicable
225
(Hematopoietic stem cell transplant recipients with latent TB infection (LTBI))
fctcevyeno(glgjaoekew) = vjvemqwsee xgitighynx (jsfhuqqqpj )
Positive
12 May 2026
Placebo
-
Phase 4
500
1 month of rifapentine and isoniazid
pklpfbuxqj(fmztzuyfyr) = czftlizjoy bgyablrrry (iuuibjcrjw )
Negative
10 Feb 2026
3 months of rifapentine and isoniazid
pklpfbuxqj(fmztzuyfyr) = dajpbeavss bgyablrrry (iuuibjcrjw )
Phase 2
104
bpsifhomsl(zjssrmleus) = rwkjneyuuk dakxbyafal (tawdautgsg, kxwdwaktwt - xmwthkmrgk)
-
27 Aug 2025
(Arm 2: Standard of Care)
bpsifhomsl(zjssrmleus) = ukdaapepwv dakxbyafal (tawdautgsg, dlmfopqkrk - ulpwkzhbaj)
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Regulation

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