Viagra is a medical trademark under which the medical drug sildenafil is generally fabricated and sold. It is well-known as a truly magical remedy amidst men with erectile disfunction. Sildenafil is also manufactured under a different brand, Revatio, which is most commonly used in cases of pulmonary arterial hypertension and improves exercise capacity quite well. Unlike Viagra, this medication is used by both genders.

It is important to be aware of Viagra's side effects and contra indications before you start taking this medication systematically. These effects include dizziness, nausea, pain/numbness in the chest area (sometimes spreading over to the arms, neck or jaw) and usually manifest themselves throughout the sexual intercourse. If you notice any of these signs, do contact your doctor immediately! Also, a small number of patients taking Viagra have suffered sudden spells of sight loss. This is not a frequent occurence yet needs to be kept in mind.

Viagra is a medication that you take only when needed, which means 30 to 60 minutes prior to the sexual act. Remember that the drug will not give you an instant erection, it will help your penis arouse through external stimulation. The amounts of medicine per taking need to be adjusted by the doctor and handled with care; if you overdose, the side effects will hit you quite soon. The best advise in this case would be to seek urgent medical aid.