Erectile Dysfunction (ED) is one of the most disheartening problems in the life of a man that develops barriers in his relationship. An inability to achieve or sustain an erection makes it difficult for a man to have sexual intercourse with his partner. This leaves the sexual needs of both the partners unfulfilled. It becomes embarrassing for a man to talk to his partner about his problems. While it may seem certainly difficult to get out of this situation, there are treatments available that can help you to get rid of the ill-effects of ED. The prevalence of this disorder increases with age, affecting men who are above 40 years of age. Underlining the exact cause of the problem becomes essential so that a suitable treatment can be given to you by the doctor. The causes of ED can be either physical or psychological. However, psychological ED is known to affect less than 10% of the population. Diabetes and cardiovascular disorders have been known to be the major causes of ED affecting a large population worldwide. The problem of ED results in improper flow of blood due to which an erection does not occur. To treat this problem, doctors recommend taking a single dose of ED pills such as Viagra, Cialis, Levitra, etc. in 24 hours. These medicines are given after examining your exact condition. Depending upon how severe your condition is, your doctor may change your dose accordingly. While the function of all the medicines is the same (increasing the blood flow to the penis), their effects largely differ from each other. The effects of Viagra and Levitra are known to last for a period of 4-5 hours and 5 hours respectively. On the other hand, the effects of Cialis last for a period of 36 hours. Following the doctor’s prescription is necessary to achieve positive results and avoid facing the harmful effects of the drug.