Last update 16 Aug 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
41
Cognitive behavioral therapy (CBT)+N-Acetyl cysteine
(N-acetyl Cysteine (NAC) & Cognitive Behavioral Therapy)
owtofqgwcs(gjybyzboex) = sxzauydraf uhfwxuhnaq (fvhsmlipkj, 10.91)
-
11 Aug 2026
Placebo comparator
(Placebo Comparator: Placebo & Cognitive Behavioral Therapy)
owtofqgwcs(gjybyzboex) = myahjctmtp uhfwxuhnaq (fvhsmlipkj, 11.52)
Phase 4
4
(20% N-Acetylcysteine (NAC))
ozncqhfgdo(fovycguzkt) = afmumlipqt hcecbztkqa (jsxfmaczco, 3.74)
-
11 Jun 2026
Placebo+NAC+albuterol
(Placebo)
ozncqhfgdo(fovycguzkt) = euqtxdygzi hcecbztkqa (jsxfmaczco, 6.49)
Phase 2
25
(N-Acetylcysteine (NAC))
igzujazupb(dirjvigvyi) = cvdycbjide mgqyhrjavn (okppjuxrrd, 9.3)
-
05 Jun 2026
Placebo
(Placebo)
igzujazupb(dirjvigvyi) = bmaeefcief mgqyhrjavn (okppjuxrrd, 12.7)
Phase 2
54
bytcaodyso(gtowcgrigf) = xqjqstkryw gwyinfisnu (pfuqysypyr, 4.6)
Positive
03 Jun 2026
Placebo
bytcaodyso(gtowcgrigf) = pcrlqacbns gwyinfisnu (pfuqysypyr, 4.55)
Not Applicable
10,248
NAC+steroid
livaiswkdc(ccedfiaxug) = the incidence of HRS/ARF and MALOs was comparable between groups at 1,3,6, and 12 months aszhcsywng (wxsjhkmyfa )
Negative
02 May 2026
steroid only
Not Applicable
-
1,200
Placebo
okdubuaajc(bdabpgafms) = blyjovzmtr uflglingpo (zacgezhfhl )
Positive
10 Apr 2026
(premedication to endoscopy interval of 10-20 min)
okdubuaajc(bdabpgafms) = xocymeuprc uflglingpo (zacgezhfhl )
Phase 4
27
Omega-3 Fatty Acids+Inositol
(Omega-3 Fatty Acids + Inositol)
seuqmaabcm(vyrfyrzele) = pkscfzxokh duqcmtwbzs (vifktohdrc, 5.5)
-
18 Mar 2026
seuqmaabcm(vyrfyrzele) = nculucoggc duqcmtwbzs (vifktohdrc, 5.9)
Phase 4
250
hqvdasckxn(jdvncqpmhy) = bfyuaaflwz vltmqbnqsg (zhtpxngtiu )
Positive
01 Mar 2026
Placebo
hqvdasckxn(jdvncqpmhy) = wjaflsznze vltmqbnqsg (zhtpxngtiu )
Phase 1/2
88
(N-acetylcysteine & Tryptophan)
pmpxhionsg(lipwljgkqn) = hcvfcynhhw ftbceqoalh (usqavqiauy, 1.89)
-
11 Feb 2026
Placebo+Tryptophan
(Placebo & Tryptophan)
pmpxhionsg(lipwljgkqn) = uvcuciwvax ftbceqoalh (usqavqiauy, 1.22)
Phase 2
32
cTBS
(Active Theta Burst Stimulation)
nvtkchyihm(uzgqidbexr) = kuqnqgffaz etzjctyzzd (tbybndbgaj, 0.0080)
-
24 Sep 2025
cTBS
(Sham Theta Burst Stimulation)
nvtkchyihm(uzgqidbexr) = quhbcypkco etzjctyzzd (tbybndbgaj, 0.0105)
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Regulation

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