Viagra has some side effects, including hepatotoxicity, acute liver injury. It seems not useful for liver, damaged by HCV. See http://livertox.nih.gov/Sildenafil.htm
Hepatic Impairment
In volunteers with hepatic impairment (Child-Pugh Class A and B), sildenafil clearance was reduced, resulting in higher plasma exposure of sildenafil (47% for Cmax and 85% for AUC). The pharmacokinetics of sildenafil in patients with severely impaired hepatic function (Child-Pugh Class C) have not been studied. A starting dose of 25 mg should be considered in patients with any degree of hepatic impairment [see Dosage and Administration (2.5) and Clinical Pharmacology (12.3)].
http://www.drugs.com/pro/viagra.html
Lloyd Wright is a quack who profits off of other people's misery, with absolutely no chance of curing them
I have no idea bit Mr. Wright has been extremely controversial for many years. Ask your doc or your pharmacist.