Delparantag

Delparantag (PMX-60056) is a salicylamide derivative and an effective unfractionated heparin (UFH) and low molecular weight heparin (LMWH) reversing agent. Delparantag shows ability to neutralize the anticoagulation and bleeding effects of UFH and LMWH^[1][2]. In Vitro: Delparantag is designed to restore coagulation by specifically binding to the pentasaccharide and disrupting UFH and LMWH interaction with antithrombin^[1].
In heparinized plasma, Delparantag (PMX-60056) is more potent on a gravimetric basis than protamine at neutralizing both anti-Xa and anti-IIa activities. Delparantag is able to completely neutralize heparin at an approximate 2:1 gravimetric ratio. The amount of residual anti-IIa and anti-Xa activity was significantly less with Delparantag at a concentration of 50 mg/mL. In plasma anticoagulated with enoxaparin, Delparantag produces a concentration-dependent neutralization of anti-Xa activity. The amount of anti-Xa activity remaining after supplementation of the neutralizing agent is significantly less with Delparantag at concentrations above 25 mg/mL^[2]. In Vivo: Delparantag (PMX-60056; 0.5 mg/kg, 1.0 mg/kg, or 2.0 mg/kg; intravenous injection; once; male Sprague-Dawley rats) treatment neutralizes the antithrombotic, anticoagulant, and bleeding effects of heparins as effectively as protamine sulfate and may be slightly more efficacious against LMWHs^[2].
Plasma half-life elimination of Delparantag is between 3 and 5 min^[1].