Viagra and Cialis are drugs which are used to treat erectile dysfunction which is other wise termed as impotence and pulmonary arterial hypertension. These pills relaxes the smooth muscle of the penis and makes it hard and then allow an increase in the blood flow in the penis and thus results in a successful erection. These drugs come only as tablets which have to be taken by mouth. They should never be split, or chewed or crushed. Instead, these medicines have to be swallowed on the whole along with a glass of water. It is recommended by the healthcare professional and the manufacturer of the drugs that these drugs has to be taken an hour before the sexual interaction but it is unofficially recommended and used around 4 to 30 minutes before the activity. But at any cost it should not be taken more than once in every 24 hours. These dosages have to be preserved in its original container which is tightly closed. It should be kept out of the reach of children. The capsules and tablets should only be stored at room temperature and should always be kept away from both excess heat and moisture. Outdated medicines should not be used at all. Before a user starts with the medicine he needs to take the advice of both the doctor and the Pharmacist if the user is allergic to Viagra or any other similar medications, and if the user is a regular in-taker of any nitrates. Either the doctor or the Pharmacist can be consulted on these if the user is not really aware of the fact. No street drugs which will contain nitrates should be taken along with Viagra and Cialis. Even the user should check whether the herbal in takes he uses has a nitrate ingredient. The user needs to avoid smoking and even avoid in taking all alcoholic beverages while using these medicines. Strictly Viagra and Cialis has to be consumed only be men as it helps in erectile dysfunction, when used by women and children will have a serious effect on their body and health. Women, particularly pregnant and women who are breast feeding should not use the medicine and if at all they use, should immediately report it to the doctor. To buy Viagra or buy Cialis all a user has to do is just get online, if he wishes to have complete privacy, and check out for the official websites of these medicines and just click on the purchase page of the website and then fill out the medical questionnaire listed out in the website. The medical and healthcare professionals will go through the questionnaire filled out by the user, carefully and then would prescribe a suitable dosage to the user which will be sent by safe courier. But a user cannot avail all these advantages if he prefers to purchase generic Viagra or in fact any of the generic medicines. Though the content and ingredients of the medicines are same, these medicines are manufactured by companies who have not received their license by the United States Government.