Famotidine Related Compounds & Impurities

Famotidine is a competitive histamine H2-receptor antagonist that suppresses basal and stimulated gastric acid secretion, used for GORD and peptic ulcer disease.

Simson Pharma Limited along with its subsidiary offices Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) is a trusted manufacturer and supplier of high-quality pharmaceutical reference standards, offering a comprehensive portfolio of Famotidine reference standards, pharmacopeial and non-pharmacopeial Famotidine impurities, related compounds, related substances, metabolites, stable isotope-labelled compounds, deuterium labelled compounds and nitrosamine (N-NO) reference standards.

These materials support pharmaceutical research and development, product development, ANDA and DMF submissions, quality control (QC), analytical method development and validation, stability studies, impurity identification, and genotoxic impurity assessment.

Our Famotidine-related reference standards are thoroughly characterized using advanced analytical techniques and are supplied with comprehensive Certificates of Analysis (COA) and supporting analytical data from our USFDA certified, ISO 17025 and ISO 17034 accredited Lab, to meet global regulatory expectations. EP and USP traceable reference standards can also be provided upon request, subject to availability. Simson is also a provider of EP and USP traceable standards. To ensure consistent quality and reliability, our reference standards are periodically re-tested according to established quality management procedures.

Pharmaceutical Reference Standards / Impurity Standards

Famotidine
Famotidine
  • CAT. No.F100000
  • CAS. No.76824-35-6
  • Mol. F.C8H15N7O2S3
  • Mol. W.337.45 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity A Hydrochloride
Famotidine EP Impurity A Hydrochloride
  • CAT. No.F100001
  • CAS. No.76833-47-1
  • Mol. F.C8H15ClN6S2
  • Mol. W.294.83 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity A
Famotidine EP Impurity A
  • CAT. No.F100001A
  • CAS. No.124646-10-2
  • Mol. F.C8H14N6S2
  • Mol. W.258.37 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity B
Famotidine EP Impurity B
  • CAT. No.F100002
  • CAS. No.89268-62-2
  • Mol. F.C16H23N11O2S5
  • Mol. W.561.75 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity C
Famotidine EP Impurity C
  • CAT. No.F100003
  • CAS. No.106433-44-7
  • Mol. F.C8H14N6O3S3
  • Mol. W.338.43 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity D
Famotidine EP Impurity D
  • CAT. No.F100004
  • CAS. No.76824-16-3
  • Mol. F.C8H13N5OS2
  • Mol. W.259.35 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity E
Famotidine EP Impurity E
  • CAT. No.F100005
  • CAS. No.129083-44-9
  • Mol. F.C10H14N8S4
  • Mol. W.374.53 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity F
Famotidine EP Impurity F
  • CAT. No.F100006
  • CAS. No.107880-74-0
  • Mol. F.C8H12N4O2S2
  • Mol. W.260.34 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity G
Famotidine EP Impurity G
  • CAT. No.F100007
  • CAS. No.76823-97-7
  • Mol. F.C9H13N7S2
  • Mol. W.283.38 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity G Maleate
Famotidine EP Impurity G Maleate
  • CAT. No.F100007A
  • CAS. No.NA
  • Mol. F.C13H17N7O4S2
  • Mol. W.399.45 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Sulfoxide
Famotidine Sulfoxide
  • CAT. No.F100008
  • CAS. No.90237-03-9
  • Mol. F.C8H15N7O3S3
  • Mol. W.353.45 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity J
Famotidine EP Impurity J
  • CAT. No.F100009
  • CAS. No.76824-14-1
  • Mol. F.C9H15N5OS2
  • Mol. W.237.37 g/mol
  • Stock Status:Instock
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Famotidine Acid Methyl Ester Hydrochloride
Famotidine Acid Methyl Ester Hydrochloride
  • CAT. No.F100010
  • CAS. No.1798006-30-0
  • Mol. F.C9H15ClN4O2S2
  • Mol. W.310.82 g/mol
  • Stock Status:Instock
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Famotidine Impurity 25
Famotidine Impurity 25
  • CAT. No.F100011
  • CAS. No.NA
  • Mol. F.C9H14N4O2S2.C2H4O2
  • Mol. W.334.42 g/mol
  • Stock Status:Instock
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Famotidine Impurity H Dihydrochloride
Famotidine Impurity H Dihydrochloride
  • CAT. No.F100012
  • CAS. No.88046-01-9
  • Mol. F.C6H12Cl2N6S2
  • Mol. W.303.24 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity I
Famotidine EP Impurity I
  • CAT. No.F100016
  • CAS. No.1020719-36-1
  • Mol. F.C8H14N6O4S3
  • Mol. W.354.43 g/mol
  • Stock Status:Instock
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Famotidine Degradation Impurity 1
Famotidine Degradation Impurity 1
  • CAT. No.F100017
  • CAS. No.NA
  • Mol. F.C8H12N4O2S2
  • Mol. W.260.34 g/mol
  • Stock Status:Limited Stock
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Famotidine Degradation Impurity 2
Famotidine Degradation Impurity 2
  • CAT. No.F100018
  • CAS. No.76824-16-3
  • Mol. F.C8H13N5OS2
  • Mol. W.259.35 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Cyanoethyl Impurity
Famotidine Cyanoethyl Impurity
  • CAT. No.F100019
  • CAS. No.76823-93-3
  • Mol. F.C8H11N5S2
  • Mol. W.241.34 g/mol
  • Stock Status:Instock
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Famotidine Adduct Impurity
Famotidine Adduct Impurity
  • CAT. No.F100020
  • CAS. No.1994267-84-3
  • Mol. F.C15H19N7O2S3
  • Mol. W.425.55g/mol
  • Stock Status:Instock
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N-Sulphamyl-3-chloropropionamidine hydrochloride
N-Sulphamyl-3-chloropropionamidine hydrochloride
  • CAT. No.F100021
  • CAS. No.106649-95-0
  • Mol. F.C3H8ClN3O2S.HCl
  • Mol. W.222.09 g/mol
  • Stock Status:Instock
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Famotidine Ep Impurity H
Famotidine Ep Impurity H
  • CAT. No.F100023
  • CAS. No.106649-96-1
  • Mol. F.C6H10N6S2
  • Mol. W.230.31 g/mol
  • Stock Status:Custom Synthesis
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Famotidine chloromethyl impurity
Famotidine chloromethyl impurity
  • CAT. No.F100024
  • CAS. No.81152-53-6
  • Mol. F.C5H7ClN4S
  • Mol. W.190.65 g/mol
  • Stock Status:Custom Synthesis
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N-Nitroso Famotidine - I
N-Nitroso Famotidine - I
  • CAT. No.F100025
  • CAS. No.NA
  • Mol. F.C8H14N8O3S3
  • Mol. W.366.44 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity C
Famotidine Impurity C
  • CAT. No.F100026
  • CAS. No.NA
  • Mol. F.C9H15N7O2S3.C4H4O4
  • Mol. W.465.53 g/mol
  • Stock Status:Instock
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Famotidine Form A
Famotidine Form A
  • CAT. No.F100027
  • CAS. No.76824-35-6
  • Mol. F.C8H15N7O2S3
  • Mol. W.337.45 g/mol
  • Stock Status:Instock
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Famotidine Impurity 2
Famotidine Impurity 2
  • CAT. No.F100030
  • CAS. No.95907-34-9
  • Mol. F.C5H9ClN4OS
  • Mol. W.208.67 g/mol
  • Stock Status:Custom Synthesis
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2-{4-[({2-[3-(hydroxymethyl)-1,1-dioxido-3,4-dihydro-2H-1,2,4,6-thiatriazin-5-yl]ethyl}sulfanyl) methyl]-1,3-thiazol-2-yl}guanidine Maleate salt
2-{4-[({2-[3-(hydroxymethyl)-1,1-dioxido-3,4-dihydro-2H-1,2,4,6-thiatriazin-5-yl]ethyl}sulfanyl) methyl]-1,3-thiazol-2-yl}guanidine Maleate salt
  • CAT. No.F100031
  • CAS. No.NA
  • Mol. F.C10H17N7O3S3.C4H4O4
  • Mol. W.495.55 g/mol
  • Stock Status:Custom Synthesis
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3,5-bis(2-chloroethyl)-4h-1,2,4,6-thiatriazine1,1-dioxide
3,5-bis(2-chloroethyl)-4h-1,2,4,6-thiatriazine1,1-dioxide
  • CAT. No.F100032
  • CAS. No.NA
  • Mol. F.C6H9Cl2N3O2S
  • Mol. W.258.13 g/mol
  • Stock Status:Custom Synthesis
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(2-CYANOETHYL)SULFAMIC ACID
(2-CYANOETHYL)SULFAMIC ACID
  • CAT. No.F100033
  • CAS. No.NA
  • Mol. F.C3H6N2O3S
  • Mol. W.150.16 g/mol
  • Stock Status:Custom Synthesis
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2-Cyanoethyl Carbamimidothioate
2-Cyanoethyl Carbamimidothioate
  • CAT. No.F100035
  • CAS. No.57536-15-9
  • Mol. F.C4H7N3S
  • Mol. W.129.18 g/mol
  • Stock Status:Custom Synthesis
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1-((2-Guanidinothiazol-4-yl)methyl)thiourea
1-((2-Guanidinothiazol-4-yl)methyl)thiourea
  • CAT. No.F100036
  • CAS. No.NA
  • Mol. F.C6H10N6S2
  • Mol. W.230.31 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 12
Famotidine Impurity 12
  • CAT. No.F100037
  • CAS. No.20166-91-0
  • Mol. F.C5H8N4S2
  • Mol. W.188.28 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Cyclic Impurity
Famotidine Cyclic Impurity
  • CAT. No.F100038
  • CAS. No.2169078-41-3
  • Mol. F.C3H7N3O2S
  • Mol. W.149.17 g/mol
  • Stock Status:Custom Synthesis
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Famotidine related compound C
Famotidine related compound C
  • CAT. No.F100039
  • CAS. No.76824-17-4
  • Mol. F.C8H15ClN6O3S3
  • Mol. W.374.89 g/mol
  • Stock Status:Instock
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2-(4-(chloromethyl)-4-hydroxy-2-thiazolin-2-yl)guanidine hydrochloride
2-(4-(chloromethyl)-4-hydroxy-2-thiazolin-2-yl)guanidine hydrochloride
  • CAT. No.F100040
  • CAS. No.95907-33-8
  • Mol. F.C5H10Cl2N4OS
  • Mol. W.245.13 g/mol
  • Stock Status:Custom Synthesis
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2-((2-((carboxymethyl)(nitroso)amino)ethyl)amino)acetic acid
2-((2-((carboxymethyl)(nitroso)amino)ethyl)amino)acetic acid
  • CAT. No.F100041
  • CAS. No.NA
  • Mol. F.C6H11N3O5
  • Mol. W.205.17 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Chloromethyl Impurity
Famotidine Chloromethyl Impurity
  • CAT. No.F100042
  • CAS. No.69014-12-6
  • Mol. F.C5H8Cl2N4S
  • Mol. W.227.11 g/mol
  • Stock Status:Custom Synthesis
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N-Sulfamoylacrylimidamide
N-Sulfamoylacrylimidamide
  • CAT. No.F100043
  • CAS. No.95853-46-6
  • Mol. F.C3H7N3O2S
  • Mol. W.149.17 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Nitroso Impurity 1
Famotidine Nitroso Impurity 1
  • CAT. No.F100044
  • CAS. No.NA
  • Mol. F.C8H14N8O3S3
  • Mol. W.366.40 g/mol
  • Stock Status:Custom Synthesis
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N-Nitroso Famotidine-II
N-Nitroso Famotidine-II
  • CAT. No.F100045
  • CAS. No.NA
  • Mol. F.C8H15N8O3S3
  • Mol. W.367.45 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 14
Famotidine Impurity 14
  • CAT. No.F100046
  • CAS. No.NA
  • Mol. F.C6H12ClN3O2S
  • Mol. W.225.70 g/mol
  • Stock Status:Custom Synthesis
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N-Nitroso Famotidine EP Impurity B
N-Nitroso Famotidine EP Impurity B
  • CAT. No.F100047
  • CAS. No.NA
  • Mol. F.C16H22N12O3S5
  • Mol. W.590.70 g/mol
  • Stock Status:Custom Synthesis
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(Z)-3-(((2-((diaminomethylene)amino)thiazol-4-yl)methyl)thio)-N`-nitrosopropanimidamide
(Z)-3-(((2-((diaminomethylene)amino)thiazol-4-yl)methyl)thio)-N`-nitrosopropanimidamide
  • CAT. No.F100048
  • CAS. No.NA
  • Mol. F.C8H13N7OS2
  • Mol. W.287.37 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity (E/Z Mixuture)
Famotidine Impurity (E/Z Mixuture)
  • CAT. No.F100049
  • CAS. No.NA
  • Mol. F.C3H8ClN3O2S
  • Mol. W.185.63 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 38
Famotidine Impurity 38
  • CAT. No.F100050
  • CAS. No.86794-42-5
  • Mol. F.C5H8N4OS
  • Mol. W.172.21 g/mol
  • Stock Status:Custom Synthesis
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Famotidine EP Impurity A Dihydrochloride
Famotidine EP Impurity A Dihydrochloride
  • CAT. No.F100051
  • CAS. No.88061-72-7
  • Mol. F.C8H14N6S2.2HCl
  • Mol. W.331.29 g/mol
  • Stock Status:Instock
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Famotidine EP Impurity F Dihydrochloride
Famotidine EP Impurity F Dihydrochloride
  • CAT. No.F100052
  • CAS. No.107880-74-0 (free base)
  • Mol. F.C8H12N4O2S2.2HCl
  • Mol. W.333.26 g/mol
  • Stock Status:Instock
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Famotidine Impurity 39
Famotidine Impurity 39
  • CAT. No.F100053
  • CAS. No.95853-51-3
  • Mol. F.C5H8N4S2
  • Mol. W.188.28 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Form B
Famotidine Form B
  • CAT. No.F100054
  • CAS. No.76824-35-6
  • Mol. F.C8H15N7O2S3
  • Mol. W.337.45 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 23
Famotidine Impurity 23
  • CAT. No.F100055
  • CAS. No.NA
  • Mol. F.C14H25N7O7S3
  • Mol. W.499.59 g/mol
  • Stock Status:Custom Synthesis
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Famotidine EP Impurity B Maleate
Famotidine EP Impurity B Maleate
  • CAT. No.F100056
  • CAS. No.89268-62-2 (free base)
  • Mol. F.C16H23N11O2S5.C4H4O4
  • Mol. W.677.82 g/mol
  • Stock Status:Instock
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Famotidine S,S Diguanidino Impurity
Famotidine S,S Diguanidino Impurity
  • CAT. No.F100057
  • CAS. No.NA
  • Mol. F.C10H23N13O2S3
  • Mol. W.453.60 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 4
Famotidine Impurity 4
  • CAT. No.F100058
  • CAS. No.NA
  • Mol. F.C11H19N7O2S3
  • Mol. W.377.51 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 5
Famotidine Impurity 5
  • CAT. No.F100059
  • CAS. No.88068-99-9
  • Mol. F.C3H7ClN2O3S
  • Mol. W.186.61 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 6
Famotidine Impurity 6
  • CAT. No.F100060
  • CAS. No.NA
  • Mol. F.C6H9N5S3
  • Mol. W.274.36 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 1
Famotidine Impurity 1
  • CAT. No.F100061
  • CAS. No.76823-94-4
  • Mol. F.C9H15N5OS2
  • Mol. W.273.40 g/mol
  • Stock Status:Custom Synthesis
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Famotidine Impurity 1 Hydrochloride
Famotidine Impurity 1 Hydrochloride
  • CAT. No.F100062
  • CAS. No.1797843-63-0
  • Mol. F.C9H15N5OS2.HCl
  • Mol. W.309.80 g/mol
  • Stock Status:Custom Synthesis
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Isotope Labelled Compounds

Famotidine D4
Famotidine D4
  • CAT. No.F100014
  • CAS. No.76824-35-6(Unlabelled)
  • Mol. F.C8H11D4N7O2S3
  • Mol. W.341.47 g/mol
  • Stock Status:Instock
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Famotidine-13C D3
Famotidine-13C D3
  • CAT. No.F100015
  • CAS. No.2744683-81-4
  • Mol. F.C713CH12D3N7O2S3
  • Mol. W.341.46 g/mol
  • Stock Status:Instock
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