Fildena 150 mg is a medication containing sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor used primarily to treat erectile dysfunction (ED).The standard starting dose of Fildena (sildenafil) for most men is 50 mg, taken as needed approximately 30 minutes to 1 hour before sexual activity. Depending on individual response and tolerability, the dose may be increased to 100 mg or decreased to 25 mg. Fildena 150 mg is a higher dose and may be prescribed for individuals who do not respond adequately to lower doses.