Fildena review Medicine is a prescription medication used to treat erectile dysfunction in men. Sildenafil citrate is a component of the medication. This medicine works by boosting blood flow to the nerves. This medication should be taken about 1 hour before sexual intercourse to have longer intercourse with your partner. This drug can be taken on an empty stomach or after a meal. This medication can only be taken with water. Fatty foods or cold drinks should not be consumed with this medication because they reduce its effectiveness.