Fildena Professional, it is a sildenafil product marketed in a sublingual form (designed to dissolve under the tongue). However, I wouldn't describe it as a universally “commonly used” ED medicine like Viagra; its availability and use vary by country. The manufacturer lists its Cenforce Professional equivalent as sildenafil citrate sublingual tablets. C centurionlaboratories.Fildena Professional considering Fildena Professional vs Fildena 50/100, the important difference is the strength and formulation, not that one is inherently stronger or safer. If you tell me the strength printed on your Fildena Professional package, I can explain how it compares with Fildena 50 and Fildena 100.