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Sildenafil (Viagra) Research — Washington
Sildenafil (Viagra) is a PDE5 inhibitor / cGMP phosphodiesterase inhibitor researched for PDE5 Inhibition Reference Compound, Pulmonary Arterial Hypertension, Erectile Dysfunction / Sexual Function Research. QSC ships Sildenafil domestically to Washington with Janoshik third-party COA verification.
Sildenafil was the first selective PDE5 inhibitor discovered (Pfizer, 1989). Inhibits PDE5 with IC50 ~3.5 nM, >10-fold selectivity over PDE6 (retina) and >700-fold over other PDE isoforms. Mechanism: smooth muscle relaxation via elevated cGMP in PDE5-expressing tissues. Shorter half-life (~4h) than tadalafil makes it preferred for acute, on-demand dosing research designs. Also … Full Sildenafil Research Hub →
QSC Shipping to Washington
Domestic USA fulfilment — orders to Washington ship 3–5 business days. Sealed, temperature-appropriate, discrete packaging with Janoshik COA included.
