Avosentan

Description

Avosentan Ro 67-0565; SPP-301 is an orally active endothelin ETA receptor antagonist. Avosentan can block the ETA receptor, thereby reducing vascular contraction and exerting a renal protective effect. Avosentan inhibits vascular contraction caused by ET-1 and alleviates the reduction in retinal and optic nerve head blood flow induced by it, lowering intraocular pressure in the glaucoma monkey model. Avosentan non-specifically blocks ETB receptors at high doses, inhibiting ETB-mediated diuresis and natriuresis, and may cause fluid retention. Avosentan can be used to reduce proteinuria with diabetic nephropathy, but induces significant fluid overload and congestive heart failure.