Vardenafil hydrochloride trihydrate (I.V.; 0.03 mg/kg) exhibits facilitator effects in rats with cavernous nerve injury. Vardenafil hydrochloride trihydrate (I.V.; 0.17 mg/kg once daily; 7 days) protects liver against Con A–induced hepatitis, and decreases the expression of NF-??B and iNOS in hepatic tissue. Vardenafil hydrochloride trihydrate (P.O.; 10 mg/kg once daily; 25 weeks) prevents the reduction of tissue cGMP levels and the increase in 3-NT generation in ZDF hearts.