Vardenafil hydrochloride is a selective and orally active inhibitor of phosphodiesterase-5 (PDE5) with an IC50 of 0.7 nM, showing lower inhibition of PDE1, PDE6, PDE3, and PDE4. It competitively inhibits cGMP hydrolysis, leading to increased cGMP levels. It is used for research of erectile dysfunction, hepatitis, and diabetes.
- Specifically inhibits cGMP hydrolysis by PDE5, increasing intracellular cGMP levels for increased dilation and blood flow.
- Exhibits facilitator effects in rats with cavernous nerve injury.
- Protects the liver against Con A-induced hepatitis in mice and decreases NF-κB expression.
- Prevents reduction of tissue cGMP levels and increased 3-NT generation in ZDF hearts.