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Cat. No. M9182
Gefapixant Structure

AF-219; MK-7264

Size Price Availability Quantity
10mM*1mL In DMSO USD 110 In stock
5mg USD 105 In stock
10mg USD 170 In stock
Free Delivery on orders over USD 500 Bulk Inquiry?

Quality Control
  • Current batch:
  • Purity >98%
  • COA
  • MSDS
Biological Activity

Gefapixant (AF-219) is an orally active small molecule antagonist at human P2X3-containing receptors, with IC50s of ~30 nM versus recombinant hP2X3 homotrimers and 100-250 nM at hP2X2/3 heterotrimeric receptors. 

In vivo, in a rat model of knee osteoarthritis (14d following intra-articular administration of monoiodoacetate), Gefapixant (7d bid, orally; right) attenuates the weight bearing laterality with complete reversal of apparent hyperalgesia at the two higher doses.

Cell Experiment
Cell lines
Preparation method
Incubation time
Animal Experiment
Animal models Rats
Dosages 6, 20, and 60 mg/kg two times a day and continues up to a week
Administration by intraplantar or oral
Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)
Species Mouse Rat Rabbit Guinea pig Hamster Dog
Weight (kg) 0.02 0.15 1.8 0.4 0.08 10
Body Surface Area (m2) 0.007 0.025 0.15 0.05 0.02 0.5
Km factor 3 6 12 8 5 20
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Chemical Information
Molecular Weight 353.40
Formula C14H19N5O4S
CAS Number 1015787-98-0
Purity >98%
Solubility DMSO: 4 mg/mL (Need ultrasonic and adjust pH to 5-6 with HCl)
Storage at -20°C

P2X3 receptor antagonist (AF-219) in refractory chronic cough: a randomised, double-blind, placebo-controlled phase 2 study.
Abdulqawi R, et al. Lancet. 2015 Mar 28;385(9974):1198-205. PMID: 25467586.

The therapeutic promise of ATP antagonism at P2X3 receptors in respiratory and urological disorders.
Ford AP, et al. Front Cell Neurosci. 2013 Dec 19;7:267. PMID: 24391544.

In pursuit of P2X3 antagonists: novel therapeutics for chronic pain and afferent sensitization.
Ford AP, et al. Purinergic Signal. 2012 Feb;8(Suppl 1):3-26. PMID: 22095157.

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Keywords: Gefapixant, AF-219; MK-7264 supplier, P2 Receptor, inhibitors

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