Fildena Professional 100 mg, it appears to be a sildenafil product manufactured/marketed by Fortune Healthcare in India. The manufacturer lists Fildena Professional among its sildenafil products. Whether it is reliable/safe is a little different from whether sildenafil itself works: Sildenafil is a well-established ED medicine, but the reliability of a particular Fildena product depends on authentic manufacturing, quality control, storage, and where you obtained it. I would not assume that an online seller's claims of “100% genuine” or “FDA approved” are reliable without independent verification. If you buy it, use a licensed pharmacy, check the packaging, batch/lot number, expiry date, and manufacturer information. 100 mg is the maximum usual single sildenafil dose, so I wouldn't choose the Professional 100 mg simply because it is stronger. A lower dose may provide adequate effect with fewer side effects. If you have the Fildena Professional strip/box, you can send me a photo of the front and back (hide your personal information). I can help you check the manufacturer, strength, batch/expiry information, and signs that the packaging may be questionable.