Fildena is a generic sildenafil citrate medication used to treat erectile dysfunction (ED) by increasing blood flow to the penis when sexual stimulation is present. The drug is available in multiple strength options, allowing doctors to tailor doses based on severity of ED, patient tolerance, and prior treatment experience. The 25 mg dose is the mildest and often recommended as a starting point for those new to PDE5 inhibitors or with mild symptoms. Many clinicians begin treatment at 50 mg, which is considered a standard dose balancing effectiveness and side-effect risk.