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Details

Stereochemistry ACHIRAL
Molecular Formula C5H4NOS.Na.H2O
Molecular Weight 167.161
Optical Activity NONE
Defined Stereocenters 0 / 0
E/Z Centers 0
Charge 0

SHOW SMILES / InChI
Structure of PYRITHIONE SODIUM MONOHYDRATE

SMILES

O.[Na+].[O-][N+]1=CC=CC=C1[S-]

InChI

InChIKey=HTJXGDXCIFMYMU-UHFFFAOYSA-M
InChI=1S/C5H5NOS.Na.H2O/c7-6-4-2-1-3-5(6)8;;/h1-4,8H;;1H2/q;+1;/p-1

HIDE SMILES / InChI

Molecular Formula Na
Molecular Weight 22.98976928
Charge 1
Count
Stereochemistry ACHIRAL
Additional Stereochemistry No
Defined Stereocenters 0 / 0
E/Z Centers 0
Optical Activity NONE

Molecular Formula HO
Molecular Weight 17.0073
Charge -1
Count
Stereochemistry ACHIRAL
Additional Stereochemistry No
Defined Stereocenters 0 / 0
E/Z Centers 0
Optical Activity NONE

Molecular Formula C5H5NOS
Molecular Weight 127.164
Charge 0
Count
Stereochemistry ACHIRAL
Additional Stereochemistry No
Defined Stereocenters 0 / 0
E/Z Centers 0
Optical Activity NONE

Pyrithione zinc is an antibacterial and antifungal agent developed by scientists in the 1930's. Since then it has been used to treat seborrheic dermatitis of the scalp and other skin conditions such as eczema, athlete's foot, and vitiligo, as well as psoriasis. Because of its antifungal properties, it is commonly found in dandruff shampoo. Products containing pyrithione zinc are available today with and without prescription, and it is the main ingredient in many over-the-counter creams, lotions, soaps, and shampoos. It also has antibacterial properties and is effective against many pathogens from the Streptococcus and Staphylococcus genera. Pyrithione zinc`s other medical applications include treatments of psoriasis, eczema, ringworm, fungus, athletes foot, dry skin, atopic dermatitis, tinea, and vitiligo. Its antifungal effect is thought to derive from its ability to disrupt membrane transport by blocking the proton pump that energizes the transport mechanism.

Approval Year

TargetsConditions

Conditions

ConditionModalityTargetsHighest PhaseProduct
Curative
Pyrithione zinc shampoo

Approved Use

Pyrithione zinc shampoo is used for: Treating and preventing itching, flaking, and scaling of the scalp caused by dandruff or seborrhea (oily, crusting, or scaling skin). Pyrithione zinc shampoo is an antiseborrheic. It works by slowing the production of skin cells, which helps to reduce flakiness.

Launch Date

1986
Primary
Unknown

Approved Use

Unknown
Cmax

Cmax

ValueDoseCo-administeredAnalytePopulation
0.2 μg/mL
0.5 mg/kg single, oral
dose: 0.5 mg/kg
route of administration: Oral
experiment type: SINGLE
co-administered:
PYRITHIONE plasma
Rattus norvegicus
population: HEALTHY
age: ADULT
sex: MALE
food status: FASTED
AUC

AUC

ValueDoseCo-administeredAnalytePopulation
27.01 μg × h/mL
0.5 mg/kg single, oral
dose: 0.5 mg/kg
route of administration: Oral
experiment type: SINGLE
co-administered:
PYRITHIONE plasma
Rattus norvegicus
population: HEALTHY
age: ADULT
sex: MALE
food status: FASTED
T1/2

T1/2

ValueDoseCo-administeredAnalytePopulation
115 h
0.5 mg/kg single, oral
dose: 0.5 mg/kg
route of administration: Oral
experiment type: SINGLE
co-administered:
PYRITHIONE plasma
Rattus norvegicus
population: HEALTHY
age: ADULT
sex: MALE
food status: FASTED
Doses

Doses

DosePopulationAdverse events​
1 % 2 times / week multiple, topical
Recommended
Dose: 1 %, 2 times / week
Route: topical
Route: multiple
Dose: 1 %, 2 times / week
Sources:
unhealthy, 17–64
Health Status: unhealthy
Age Group: 17–64
Sex: M+F
Sources:
Disc. AE: Erythema...
AEs leading to
discontinuation/dose reduction:
Erythema (1.25%)
Sources:
AEs

AEs

AESignificanceDosePopulation
Erythema 1.25%
Disc. AE
1 % 2 times / week multiple, topical
Recommended
Dose: 1 %, 2 times / week
Route: topical
Route: multiple
Dose: 1 %, 2 times / week
Sources:
unhealthy, 17–64
Health Status: unhealthy
Age Group: 17–64
Sex: M+F
Sources:
Overview

Overview

CYP3A4CYP2C9CYP2D6hERG

OverviewOther

Other InhibitorOther SubstrateOther Inducer
Tox targets

Tox targets

TargetModalityActivityMetaboliteClinical evidence
PubMed

PubMed

TitleDatePubMed
Zinc induces apoptosis that can be suppressed by lanthanum in C6 rat glioma cells.
2001 Aug
Antimicrobial susceptibility changes and T-OMP shifts in pyrithione-passaged planktonic cultures of Pseudomonas aeruginosa PAO1.
2002
Experimental tinea unguium model to assess topical antifungal agents using the infected human nail with dermatophyte in vitro.
2002 Dec
Requirement of caspase and p38MAPK activation in zinc-induced apoptosis in human leukemia HL-60 cells.
2002 Dec
Intracellular zinc fluctuations modulate protein tyrosine phosphatase activity in insulin/insulin-like growth factor-1 signaling.
2003 Dec 10
Characterisation of zinc uptake into rat cultured cerebrocortical oligodendrocyte progenitor cells.
2003 Dec 4
Blocking NF-kappaB activation may be an effective strategy in the fever therapy.
2003 Oct
Effect of Zn2+ ions on ryanodine binding to sarcoplasmic reticulum of striated muscles in the presence of pyrithione.
2004 Dec
Pyruvate limits zinc-induced rat oligodendrocyte progenitor cell death.
2004 Jan
Monitoring apoptosis with fluorescent Zn2+-indicators.
2004 Mar 2
Chromatographic behavior of pyrithiones.
2004 Oct 15
Evaluation of metal-conjugated compounds as inhibitors of 3CL protease of SARS-CoV.
2004 Sep 10
Activation of a calcium entry pathway by sodium pyrithione in the bag cell neurons of Aplysia.
2004 Sep 15
Fluctuations of cellular, available zinc modulate insulin signaling via inhibition of protein tyrosine phosphatases.
2005
Pyrithiones as antifoulants: environmental fate and loss of toxicity.
2005
Activation of caspase-3 in HL-60 cells treated with pyrithione and zinc.
2005 Apr
A comparison of hair quality and cosmetic acceptance following the use of two anti-dandruff shampoos.
2005 Dec
Product pharmacology and medical actives in achieving therapeutic benefits.
2005 Dec
S100A9 deficiency alters adenosine-5'-triphosphate induced calcium signalling but does not generally interfere with calcium and zinc homeostasis in murine neutrophils.
2005 Jun
Pustular psoriasis and the Kobner phenomenon caused by allergic contact dermatitis from zinc pyrithione-containing shampoo.
2005 Mar
Reaction of hydroxyl radical with aromatic hydrocarbons in nonaqueous solutions: A laser flash photolysis study in acetonitrile.
2005 Mar 24
Endogenous zinc in neurological diseases.
2005 Oct
3-Alkylpyridinium compounds as potential non-toxic antifouling agents.
2006
Unconventional neuroprotection against Ca2+ -dependent insults by metalloporphyrin catalytic antioxidants.
2006 Aug
The interactive effects of binary mixtures of three antifouling biocides and three heavy metals against the marine algae Chaetoceros gracilis.
2006 Aug
Toxicity reduction of metal pyrithiones by near ultraviolet irradiation.
2006 Aug
Inhibition of presynaptic activity by zinc released from mossy fiber terminals during tetanic stimulation.
2006 Jan
Flow cytometric measurement of labile zinc in peripheral blood mononuclear cells.
2006 May 15
Opposing effects of ERK and p38 MAP kinases on HeLa cell apoptosis induced by dipyrithione.
2007 Feb 28
NADPH-dependent coenzyme Q reductase is the main enzyme responsible for the reduction of non-mitochondrial CoQ in cells.
2008
Synergistic toxic effects of zinc pyrithione and copper to three marine species: Implications on setting appropriate water quality criteria.
2008
Synthesis and anticancer properties of water-soluble zinc ionophores.
2008 Jul 1
Aryl-bridged 1-hydroxypyridin-2-one: sensitizer ligands for Eu(III).
2008 Jul 21
Insights into Zn2+ homeostasis in neurons from experimental and modeling studies.
2008 Mar
2-(Mesitylmethylsulfanyl)pyridine N-oxide monohydrate.
2008 Sep 17
Trace metals in antifouling paint particles and their heterogeneous contamination of coastal sediments.
2009 Apr
Leaching of hydrophobic Cu and Zn from discarded marine antifouling paint residues: evidence for transchelation of metal pyrithiones.
2009 Dec
Biofouling growth in cold estuarine waters and evaluation of some chitosan and copper anti-fouling paints.
2009 Jul 14
Metal ionophores - an emerging class of anticancer drugs.
2009 Nov
Tracing of intracellular zinc(II) fluorescence flux to monitor cell apoptosis by using FluoZin-3AM.
2009 Oct
Pyrithione and 8-hydroxyquinolines transport lead across erythrocyte membranes.
2009 Sep
Activation of the orphan receptor tyrosine kinase ALK by zinc.
2010 Aug 6
The roles of iPLA2, TRPM8 and TRPA1 in chemically induced cold hypersensitivity.
2010 Jan 21
An integrated imaging approach to the study of oxidative stress generation by mitochondrial dysfunction in living cells.
2010 Jul
DNA microarray analysis suggests that zinc pyrithione causes iron starvation to the yeast Saccharomyces cerevisiae.
2010 May
Zinc signals promote IL-2-dependent proliferation of T cells.
2010 May
Cellular zinc homeostasis is a regulator in monocyte differentiation of HL-60 cells by 1 alpha,25-dihydroxyvitamin D3.
2010 May
Novel antifouling agent zinc pyrithione: determination, acute toxicity, and bioaccumulation in marine mussels (Mytilus galloprovincialis).
2010 Nov
Zn(2+) inhibits coronavirus and arterivirus RNA polymerase activity in vitro and zinc ionophores block the replication of these viruses in cell culture.
2010 Nov 4
UVB radiation induces an increase in intracellular zinc in human epidermal keratinocytes.
2010 Oct
Patents

Sample Use Guides

Shake well before each use. Wet hair thoroughly. Apply pyrithione zinc shampoo and work into a lather. Rinse thoroughly and repeat. For best results, use pyrithione zinc shampoo at least 2 times per week or as directed by your doctor. Do not use more often than once daily.
Route of Administration: Topical
In Vitro Use Guide
Pyrithione zinc had a reversible inhibitory effect on the growth of BHK 21 cells at 0.1 ug/ml, but had a rapid, irreversible inhibitory effect at 1 ug/ml associated with cell rounding and detachment.
Substance Class Chemical
Created
by admin
on Mon Mar 31 23:18:14 GMT 2025
Edited
by admin
on Mon Mar 31 23:18:14 GMT 2025
Record UNII
TYX8368Q25
Record Status Validated (UNII)
Record Version
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Name Type Language
2-PYRIDINETHIOL, 1-OXIDE, SODIUM SALT, HYDRATE (1:1:1)
Preferred Name English
PYRITHIONE SODIUM MONOHYDRATE
Common Name English
2-PYRIDINETHIOL, 1-OXIDE, SODIUM SALT, MONOHYDRATE
Systematic Name English
Code System Code Type Description
PUBCHEM
43835086
Created by admin on Mon Mar 31 23:18:14 GMT 2025 , Edited by admin on Mon Mar 31 23:18:14 GMT 2025
PRIMARY
CAS
304675-78-3
Created by admin on Mon Mar 31 23:18:14 GMT 2025 , Edited by admin on Mon Mar 31 23:18:14 GMT 2025
PRIMARY
CAS
207511-13-5
Created by admin on Mon Mar 31 23:18:14 GMT 2025 , Edited by admin on Mon Mar 31 23:18:14 GMT 2025
NON-SPECIFIC STOICHIOMETRY
FDA UNII
TYX8368Q25
Created by admin on Mon Mar 31 23:18:14 GMT 2025 , Edited by admin on Mon Mar 31 23:18:14 GMT 2025
PRIMARY
Related Record Type Details
PARENT -> SALT/SOLVATE
ANHYDROUS->SOLVATE
Related Record Type Details
ACTIVE MOIETY