Viagra is a medication that is used in the treatment of erectile dysfunction and pulmonary arterial hypertension. Its main component is sildenafil citrate. This component affects the response to sexual stimulation. Viagra can only be used by men because there is no proven effectiveness if used by women.
How to use.
Viagra should be taken about an hour before sexual activity. One is advised to stay away from grape fruit and alcohol because they are known to interfere with the metabolism of sildenafil. People who are using protease inhibitors are advised against taking Viagra since it can increase the severity of side effects. It is also advisable to keep in mind any other medication that one is taking at the moment so as to avoid any dangerous effects.
Dosage.
The recommended dose for Viagra is 50 mg and it is only taken when needed thus it is hard to miss a dose. This means that it should not be taken more than once a day. In case of an overdose one should seek medical attention immediately.
Side effects.
There are rarely any serious side effects that are experienced when using this drug. The most common side effects are headaches, dizziness, diarrhea, lightheadedness, nasal stiffness, heartburn and stomach upsets. One should contact a doctor if any other side effects that are not listed are experienced. In case of a prolonged erection that lasts over four hours, medical attention should be sought immediately because it can cause damage to the penis.
Generic and brand Viagra.
There has been an emergence of generic brands of Viagra. Since the patent rights of the medication expired, it means other companies were allowed to manufacture it. The generic versions are now available in the markets now but under different names. However, the main component (sildenafil) is included in all of them. Sildenafil is cheaper than Viagra.
How to buy Viagra online.
Viagra is available online. This is because it is much easier to shop online nowadays. Also, it is the best way to order Viagra privately. This can be partly due to the fact that most men are very sensitive when it comes to matters concerning their sexual problems. It can also be easily delivered to the most remote areas.
In South Africa, brand and generic Viagra can be easily purchased without a prescription. One can order the number of tablets they want depending on how much they need.

Medical Practitioner (General Practice) with postgraduate diplomas in Cape Town. My special interest is erectile dysfunction.