Sildenafil citrate as a phosphodiesterase inhibitor has an antioxidant effect in the blood of men

• Published in: Journal of clinical pharmacy and therapeutics Vol. 33; no. 6; pp. 635 - 640
• Main Authors: Perk, H., Armagan, A., Nazıroğlu, M., Soyupek, S., Hoscan, M. B., Sütcü, R., Ozorak, A., Delibas, N.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.12.2008; Blackwell
• Subjects: Adult; antioxidant redox system; Antioxidants - pharmacology; Biological and medical sciences; Catalase - drug effects; Catalase - metabolism; Cyclic GMP - metabolism; Humans; Lipid Peroxidation - drug effects; Male; Medical sciences; Nitric Oxide - metabolism; Oxidation-Reduction - drug effects; oxidative stress; Oxidative Stress - drug effects; Pharmacology. Drug treatments; phosphodiesterase inhibitors; Phosphodiesterase Inhibitors - pharmacology; Piperazines - pharmacology; Purines - pharmacology; Sildenafil Citrate; Sulfones - pharmacology; Superoxide Dismutase - drug effects; Superoxide Dismutase - metabolism; Time Factors; vitamin E; Young Adult; Human; Biological fluid; Oxidative stress; Vasodilator agent; 3',5'-Cyclic-GMP phosphodiesterase; Enzyme; Enzyme inhibitor; Male; Esterases; Phosphoric diester hydrolases; Antioxidant; sildenafil citrate; Blood; Phosphodiesterase 5 inhibitor; Phosphodiesterase inhibitor; antioxidant redox system; Vitamin E; Hydrolases; Adult; Sildenafil; Redox system; phosphodiesterase inhibitors
• ISSN: 0269-4727; 1365-2710; 1365-2710
• DOI: 10.1111/j.1365-2710.2008.00962.x

Summary Background and objective:  Sildenafil citrate enhances the action of nitric oxide by preventing the hydrolysis of cGMP, and is widely used to treat erectile dysfunction. We investigated the effects of sildenafil citrate administration on lipid peroxidation and antioxidant redox enzymes in blood of healthy men. Method:  Thirty healthy male subjects were divided equally into two groups. The first group was used as the control. A single dose of sildenafil citrate was administrated orally to subjects constituting the second group. Blood samples were obtained at 0, 2, 6 and 24 h after intake of the single dose of 100 mg sildenafil citrate or placebo. Results and discussion:  The dose of sildenafil citrate resulted in significant increase in the erythrocyte superoxide dismutase and catalase activities at 6 and 24 h. Plasma lipid peroxidation levels decreased slightly. There was no statistical difference in erythrocyte glutathione peroxidase activity between the placebo and sildenafil citrate groups. Conclusion:  Treatment of blood with 100 mg sildenafil citrate has protective effects on oxidative stress by inhibiting free radical formation and by supporting antioxidant redox systems.