Yonkenafil (Tunodafil), a novel phosphodiesterase 5 (PDE5) inhibitor, is effective in reducing cerebral infarction, neurological deficits, edema, and neuronal damage in the infarcted area. Yonkenafil may improve cognitive function by modulating neurogenesis and has a potential therapeutic effect on Alzheimer's disease.
Yonkenafil (4-32 mg/kg, i.v. daily for 7 days) improves behavioral outcomes after stroke and reduces cerebral infarct volume, inhibits neuronal apoptosis, and significantly enhances synaptic function in ischemic brain by modulating the expression of BDNF/TrkB and NGF/TrkA[1].
References:
[1]. Xuemei Chen, et al. Yonkenafil: a novel phosphodiesterase type 5 inhibitor induces neuronal network potentiation by a cGMP-dependent Nogo-R axis in acute experimental stroke. Exp Neurol. 2014 Nov;261:267-77.