Cialis and Grapefruit: Is it Dangerous?

Cialis - which is the brand name for the generic drug tadalafil - is a very effective solution for erectile dysfunction. It's also super popular due to how easy it is to use - you just take a pill either on a daily basis, or as and when you need it. However, like lots of medications, tadalafil can interact negatively with other substances - one of which is grapefruit.