Sometimes, Viagra doesn't show the results that are expected to occur in patients. This is uncommon, but possible. There are many reasons for this, and it is vital to know all the options before purchasing this medication. Some men don't trust that it can work for them, and this makes it difficult to prescribe the drug. Viagra works when the man is sexually excited. Because the drug works to restore the chemical disbalance in the brain, it should be taken half an hour to an hour before sexual activity, and will look no different to an erection that has occurred without the assistance of Viagra. Since Viagra was introduced in 1993 it has an 80 percent success rate with the maximum draught. For the men who are unsuccessful with the treatment, it is essential to know that Viagra does not plainly produce an erection. There has to be a definite level of sexual incitement before the chemical process can commence. Besides, both partners should have an equal desire for the sexual activities. Many people think that they need Viagra to achieve an erection without being fully sexually aroused. Intimacy alone will not help Viagra to work, as the mind has to desire the act before the blood flow to the phallus can be grown. If the partner isn't willing to have sex, then it is unlikely that the patient will be excited enough for Viagra to work. Talking over the issue with your lover, and searching for all the information together can make both partners closer, help them understand and ultimately increase awareness and sexual desire for each other. Taking Viagra 30 minutes before sexual activity, and involving in acts that excite desire can produce the better results from the treatment. Thus, the more excited both partners are, the more possible Viagra is to function right to achieve and sustain an erection without the desire fading. Mental reasons can also prevent Viagra from working correctly. It is a common issue for men suffering from erectile dysfunction to as well suffer from depression or disquietness. It is the discomfort suffered by the man that won't allow sexual satisfaction. If the man is uncomfortable due to the stereotype often attached to males who suffer from erectile dysfunction, then this could have hostile results even with Viagra. Other causes such as interruptions, or disbelief in the treatment could mean that an erection is improbable, and these factors should be treated before the practitioner prescribes Viagra. Viagra is prescribed to aid males of all ages and many levels of erectile dysfunction achieve and sustain an erection for some hours. It is one of the most popular erectile dysfunction medication on the market that has a high success rate. It doesn't have to be an issue, and with the full knowledge, sexual success is within your reach.