Fildena 100, a medication containing sildenafil citrate, typically starts working within 30 to 60 minutes after ingestion. The onset of action can vary depending on individual factors such as metabolism, age, and whether the drug is taken on an empty stomach or after a meal. It is essential to note that sexual stimulation is necessary for Fildena 100 to be effective in producing an erection. The effects of Fildena 100 can last up to 4 to 6 hours, providing a window of time for achieving and maintaining an erection. However, it is crucial to follow the prescribed dosage instructions and consult a healthcare provider for personalized guidance on the appropriate dosage and timing of Fildena 100 to optimize its effectiveness and minimize potential side effects.