Hi there, thank you for posting your question on Ehealthforum. This is not intended as a substitute to visiting your own doctor.
As far as I'm aware, Deferol has no proven efficacy. Correct me if I'm wrong here, but there are no properly conducted studies proving that Deferol actually raises serotonin levels. As for taking it with Viagra? By all means but a better question might be why take it at all? Any of these so-called "performance enhancers" can and often do lead to performance anxiety erectile dysfunction. Or in other words, instead of curing a problem they actually cause it.
Dr Andrew Rynne.
www.andrewrynne.com