Fildena Professional helps with erections because it contains sildenafil citrate, a medicine that increases blood flow to the penis. It belongs to a group of medicines called PDE-5 inhibitors. Sexual stimulation triggers the release of nitric oxide in penile tissue. This increases a chemical called cGMP, which relaxes blood vessel muscles. Sildenafil blocks the PDE-5 enzyme that breaks down cGMP. More blood flows into the penis, helping produce a firmer erection. Benefits Helps achieve harder erections. Helps maintain erection Fildena Professional intercourse. Helps men with erectile dysfunction. Usually starts working within 30–60 minutes. Effects generally last around 4–5 hours. Important precautions It does not automatically cause an erection; sexual stimulation is necessary. Never combine it with other sildenafil or tadalafil medicines. Never take it with nitrate medicines. Headache, flushing and nasal congestion are possible side effects. One important question Are you interested in Fildena Professional because you want: Maximum erection hardness? Longer-lasting erections? Better firmness when your erection is currently weak? I can explain what to expect and whether sildenafil is appropriate.