Fildena (which contains Sildenafil Citrate) is a medication used to treat erectile dysfunction (ED) in men. It works by improving blood flow to the *****, helping men achieve and maintain an erection when *****ly stimulated. Here's why Fildena (and similar medications like Viagra) needs to be taken before *****: 1. Mechanism of Action: Fildena works by inhibiting phosphodiesterase type 5 (PDE5), an enzyme that breaks down cGMP (cyclic guanosine monophosphate) in the *****. cGMP helps relax the smooth muscles in the blood vessels of the *****, allowing blood to flow in more easily and causing an erection. However, Fildena (Sildenafil) does not work automatically. It requires ***** arousal to stimulate the release of nitric oxide, which in turn triggers the production of cGMP. Without this stimulation, Fildena will not cause an erection on its own. 2. Absorption and Onset of Action: When taken orally, Fildena usually starts to work within 30 to 60 minutes. It reaches peak effectiveness about 1 hour after ingestion, but it can take longer if taken with a high-fat meal. This delay is due to the fact that the body needs time to absorb the medication into the bloodstream and for the medication to start its effects. Because of this delay, Fildena needs to be taken ahead of time (typically 30 minutes to 1 hour before *****) to ensure that it is in your system when you need it.