Phosphodiesterase inhibitor with some selectivity for PDE4 and 5. (IC50s= 53, 35, 48,12 and10 µM for PDE 1a, 2, 3, 4 and 5 respectively1). Acts as a cerebral vasodilator by selectively inducing a cGMP-independent relaxation of the intracranial vertebrobasilar artery.2 Attenuates neuroinflammation and enhances retinal ganglion cell viability in glaucoma via PKA signaling.3 A glial cell activation inhibitor.4 Enhances morphine analgesia and attenuates tolerance and withdrawaI.5 Orally active and crosses the blood-brain barrier.5
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