Men who use Fildena 25 mg for sexual problems such as erectile dysfunction and impotence. The only people who should use this medication are men over the age of 18. The ingredient in the drug that increases blood flow to men's penile tissues is sildenafil. Take this medication an hour before having sex to make sure you enjoy having sex with your partner. You can take this medication with or without food. The half-life of this medication is 24 hours. You can take this medication with or without food. Adhere to your doctor's instructions when using this medication.