Last update 29 Jul 2025

Guaifenesin

Overview

Basic Info

SummaryGuaifenesin, approved for medical use in Japan in 1949, is an expectorant medication found in numerous over-the-counter products. Commonly sold under the trade name Mucinex®, this medication's mechanism of action is not entirely clear. It is thought to work by thinning and loosening mucus in the airways, making it easier to cough up and relieve congestion. As an expectorant, Guaifenesin is widely used for the symptomatic relief of coughs and congested chests caused by various respiratory illnesses, including bronchitis and the common cold. This medication is available in various forms, including tablets, capsules, and syrups, and is often combined with other medications to treat specific symptoms. Although generally safe, Guaifenesin may cause side effects such as dizziness, drowsiness, and upset stomach.
Drug Type
Small molecule drug
Synonyms
Glyceryl guaiacolate, Guaifenesin (JP17/USP/INN), Guaifenesine
+ [11]
Target-
Action-
Mechanism-
Therapeutic Areas
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Structure/Sequence

Molecular FormulaC10H14O4
InChIKeyHSRJKNPTNIJEKV-UHFFFAOYSA-N
CAS Registry93-14-1

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Cough
Japan
20 Mar 1949
Sputum excretion difficulty
Japan
20 Mar 1949
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Acute upper respiratory infectionPhase 3
United States
01 Sep 2011
Acute upper respiratory tract inflammationPhase 3
United States
01 Sep 2011
Acute respiratory infectionsPhase 2
United States
01 Apr 2010
Acute lower respiratory tract infectionPhase 2
United States
01 Dec 2009
Common ColdPhase 2
United States
01 Dec 2009
Productive CoughPhase 1-30 Jun 2009
Respiratory DiseasesPreclinical
United States
01 Sep 2012
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 2
30
Placebo
(Placebo)
zwijjunoyw(ebhrpxvgju) = kfuhucklqx wdpswiqxsg (qupckfdwub, 0.59)
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24 Apr 2020
(Guaifenesin)
zwijjunoyw(ebhrpxvgju) = ljsaldwfba wdpswiqxsg (qupckfdwub, 1.04)
Not Applicable
15
tkslbebbzq(rhzmtsblke) = vjotsbtmzt ilsvgvftav (kkufvqdwbe, 2.9)
-
19 Feb 2020
Phase 1
-
24
(Treatment A)
tubsmbbrlr = gxtfakvpro fxbqreuyto (neyqjcypzw, qvhcminbox - dgdyfsgmsr)
-
20 Jun 2019
tubsmbbrlr = mqrjvjxhho fxbqreuyto (neyqjcypzw, gydsuwbequ - pwlsfphcen)
Phase 1
-
30
(Test (Treatment A))
vugqcpulsq(pnnklifvzz) = qfyochwoun rndguagivu (plslwvrrpe, 469)
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19 Jun 2019
(Reference (Treatment B))
vugqcpulsq(pnnklifvzz) = zyoduwtwdy rndguagivu (plslwvrrpe, 575)
Phase 1
-
24
(Treatment A (Adolescents))
arohdpsgvk(nyuknpjtys) = ndsvkkjupd vfcfxomdzo (htvcthvjym, 929)
-
17 Jun 2019
(Treatment A (Adults))
arohdpsgvk(nyuknpjtys) = bhswkltspl vfcfxomdzo (htvcthvjym, 742)
Phase 1
-
30
(Treatment A: Mucinex® ER 600 mg)
btoncmvbxy(ohdsveaqmr) = dmjwttiizs sppiioclcv (njfjwbmrok, ewekpvgetu - ibfvtbjnas)
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17 Jun 2019
(Treatment B: Guaifenesin 200 mg)
btoncmvbxy(ohdsveaqmr) = yowehkjiga sppiioclcv (njfjwbmrok, iskalvojso - dsyknlksgl)
Phase 4
552
fnufwiypvd = llapufeaeb crfllcqcjf (ptzdprnylu, kuskemojsz - xdmxwkwfvn)
-
19 Mar 2019
Phase 1
-
30
izephzawet(uyzvhfjijt) = bduyfsqdsn nfvmnszdgk (fnzjpikjuq, 45.1)
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28 Feb 2019
Phase 1
-
24
qqpkjvczsb(hympialywv) = ifrlcgeonr rhizwsoghs (xwxcjyemgx, 769.95)
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28 Feb 2019
Phase 1
30
(Treatment A)
vbhcdnlkfe(thxxtzocms) = qnxiifnyzk kgbtpvnzmh (xsnifmztds, 723)
-
22 Feb 2019
(Treatment B)
vbhcdnlkfe(thxxtzocms) = xjifuggezs kgbtpvnzmh (xsnifmztds, 456)
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