It's a curious link that they made. Many antidepressants can cause performance issues, which can be a big deal for a lot of people. Using sildenafil with it can restore that part of the vitality.
Yep that was the first one i slapped my forehead at missing, because I actually knew what it was but figured it must ALSO be a tolkien character since I was sure it wasn't an antidepressant.
> Antidepressant-like activity of sildenafil following acute and subchronic treatment in the forced swim test in mice: effects of restraint stress and monoamine depletion