Key Takeaways Vardenafil typically starts working faster, around 15 to 30 minutes after ingestion, while sildenafil may take ...

Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an intravenous (IV) form, which is only given by a doctor ...

The difference between groups was no longer significant at the end of OLT, i.e. after all patients had received tadalafil OaD treatment for 3 months (3.2 [−4.3, 10.7]; p = 0.406).