Cenforce 25 is one such drug. Which is used to treat erectile dysfunction in men. This drug works by increasing blood flow to the muscles. This medication should be taken 1 hour before planning intercourse, so that you can enjoy longer intercourse with your partner. The drug takes effect in about 30 minutes. But it varies from person to person. The effect of this drug lasts for 24 hours. Therefore this medicine should be taken only once a day. It is important to consult a doctor once before taking this medicine.