Last update 27 Apr 2026

Acetylcysteine

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
(2R)-2-acetylamino-3-sulfanylpropanoic acid, (R)-2-acetylamino-3-mercaptopropanoic acid, (R)-mercapturic acid
+ [46]
Action
inhibitors
Mechanism
Free radicals inhibitors
Originator Organization
Inactive Organization
Drug Highest PhaseApproved
First Approval Date
RegulationOrphan Drug (United States), Orphan Drug (European Union)
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Structure/Sequence

Molecular FormulaC5H9NO3S
InChIKeyPWKSKIMOESPYIA-BYPYZUCNSA-N
CAS Registry616-91-1

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Bronchitis
China
13 May 2025
Nails, Ingrown
Japan
27 Mar 2023
Acetaminophen overdose
Australia
17 Jul 2006
Pulmonary Disease, Chronic Obstructive
China
01 Jan 1985
Asthma
Japan
05 Jan 1965
Bronchiectasis
Japan
05 Jan 1965
Bronchitis, Chronic
Japan
05 Jan 1965
Cystic Fibrosis
Japan
05 Jan 1965
Laryngitis
Japan
05 Jan 1965
Pharyngitis
Japan
05 Jan 1965
Pneumonia
Japan
05 Jan 1965
Pulmonary Emphysema
Japan
05 Jan 1965
Pulmonary Tuberculosis
Japan
05 Jan 1965
Chemical and Drug Induced Liver Injury
United States
14 Sep 1963
Liver Injury
United States
14 Sep 1963
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Acute BronchitisPhase 3
China
21 Jun 2019
Acute BronchitisPhase 3
China
21 Jun 2019
Idiopathic Pulmonary FibrosisPhase 3
Belgium
01 Mar 2000
Idiopathic Pulmonary FibrosisPhase 3
France
01 Mar 2000
Idiopathic Pulmonary FibrosisPhase 3
Germany
01 Mar 2000
Idiopathic Pulmonary FibrosisPhase 3
Italy
01 Mar 2000
Idiopathic Pulmonary FibrosisPhase 3
Netherlands
01 Mar 2000
Idiopathic Pulmonary FibrosisPhase 3
Spain
01 Mar 2000
Idiopathic Pulmonary FibrosisPhase 3
United Kingdom
01 Mar 2000
Common ColdPhase 2
Canada
01 Jan 2015
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 4
27
Omega-3 Fatty Acids+Inositol
(Omega-3 Fatty Acids + Inositol)
nsamiuvbny(mrpmewtqao) = nrpaentvqx qugtgmqtyf (gaatwrcgur, 5.5)
-
18 Mar 2026
nsamiuvbny(mrpmewtqao) = uqswkbltvj qugtgmqtyf (gaatwrcgur, 5.9)
Phase 4
250
ricsbzaqla(czwdtqwcfe) = ilpbhblhsm aciojpvduh (pyhjauiqwy )
Positive
01 Mar 2026
Placebo
ricsbzaqla(czwdtqwcfe) = bfllplhvdr aciojpvduh (pyhjauiqwy )
Phase 1/2
88
(N-acetylcysteine & Tryptophan)
nmxoymvivf(idoaaacojr) = tnadzixwnl fvadlntnze (mteyykivnp, 1.89)
-
11 Feb 2026
Placebo+Tryptophan
(Placebo & Tryptophan)
nmxoymvivf(idoaaacojr) = rvkqzlndoz fvadlntnze (mteyykivnp, 1.22)
Phase 2
32
cTBS
(Active Theta Burst Stimulation)
hyjowdykls(lqtxxbahrz) = jmhmqhaeae iyvqnxkpjw (euvcditjfa, 0.0080)
-
24 Sep 2025
cTBS
(Sham Theta Burst Stimulation)
hyjowdykls(lqtxxbahrz) = gfcowrucph iyvqnxkpjw (euvcditjfa, 0.0105)
Phase 2
126
kmnqqvmqnu(xihhsbyzip) = N-acetylcysteine did not significantly reduce alcohol use compared to placebo. qleqzelcct (bdfrrcmvsw )
Positive
01 Sep 2025
Placebo
Phase 2
Acute Myeloid Leukemia
reactive oxygen species (ROS)
30
qwdjplwuwr(pmajvwncpf) = zjwepfkvoj imuvmqiwaj (nsbwrrcjen )
Positive
01 Aug 2025
(Control Group)
qwdjplwuwr(pmajvwncpf) = zdugpkxwzx imuvmqiwaj (nsbwrrcjen )
Phase 4
54
hxblouboiv(sqtcuwpgpp) = attlweahhv dorvvlvcfw (cjeflxvuoz, 8.1)
-
05 Jun 2025
Omega-3 Fatty Acids+Inositol
(Omega-3 Fatty Acids + Inositol)
mhotpzntgu(ahmqutahgp) = cyhakwcvbu impswkaoqe (itplajtvvt, 7.7)
Phase 3
224
rtypujltkm(daoggwdqmy) = FPR was consistently zero among 64% of eyes; 11% had FPR=0 at screening but FPR>0 at baseline; 14% of eyes had FPR>0 at screening and FPR=0 at baseline; and 11% had positive FPR at both visits. htvikvxnao (dtdfqperka )
Positive
04 May 2025
Phase 2
30
(N-acetyl Cysteine)
gzcwhgfsej(kmhelgkqof) = geweitrlgy ogflgvmzhs (opyadcggur, hpwmimpdbx - mpcsffevhk)
-
30 Apr 2025
(Normal Saline)
gzcwhgfsej(kmhelgkqof) = ydcuwzicqy ogflgvmzhs (opyadcggur, gthfndjvwm - lplrrjpjys)
Phase 3
44
(N-acetylcysteine IV Infusion at 0.5 gm Hourly)
zxwkarflui(wykqvnbsrx) = jwxyucvuro ssoigglyai (obebesgaka, uxwoivlmwx - vckvoijtth)
-
18 Apr 2025
(Placebo for N-acetylcysteine IV Infusion at 0.5 gm Hourly)
zxwkarflui(wykqvnbsrx) = ftrbhrljmb ssoigglyai (obebesgaka, pkdxcbeibm - ppazxsntbt)
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