The story
From [Term?] + -afil (“inhibitor of phosphodiesterase PDE5 with vasodilator action”).
Etymology from Wiktionary, CC BY-SA 4.0.
tadalafil
Today it means: A drug, C₂₂H₁₉N₃O₄, that is used to treat erectile dysfunction and benign prostatic hyperplasia and functions similarly to sildenafil. It is marketed under the trademark Cialis. Full definition →