Fildena 25 mg (and related tablets What Fildena 25 mg Is Fildena 25 mg contains sildenafil citrate, the same active drug used in Viagra, and belongs to the class of PDE‑5 inhibitors for erectile dysfunction (ED).   How Long Fildena 25 mg Typically Lasts Duration of effect: • For Fildena 25 mg (sildenafil) the erection‑supporting effect usually lasts about 3–5 hours after taking the tablet. • With normal dosing and ***** arousal, most men find the effective window is around 4–5 hours, although individual responses vary. So in terms of “lasting the longest,” Fildena 25 mg itself doesn’t have a longer duration than other sildenafil tablets — its effect window is generally the same as other doses of the same drug.   Does the dose affect duration? Higher doses (e.g., 50 mg, 100 mg) don’t significantly extend how long the medicine lasts — they mainly influence how strong the effect may be. So whether you take 25 mg or 100 mg of Fildena, the effective erectile window is about the same approximate length (around 4–5 hours), though strength and individual sensitivity can vary.  How Fildena Compares With Other ED Drugs If by “longest” you mean which ED pill lasts the longest in the body, then: Fildena / Sildenafil (Viagra‑type): ~4–6 hours. Other PDE‑5 options with longer duration: • Tadalafil (Cialis‑type): lasts up to 24–36 hours — a much longer window (“weekend pill”). So PDE‑5 inhibitors differ in how long their effects remain. Sildenafil (Fildena) lasts for several hours, while tadalafil lasts much longer.