Indications for use of Viagra (sildenafil) first of all include treatment of sexual dysfunction in men. Sildenafil is also known under the other trade name such as Revatio. This drug treats pulmonary arterial hypertension (PAH) and enhances physical endurance in both men and women.
While using nitrates for alleviation of chest pain or heart disorders it is not recommended to take Viagra. The list of nitrate drugs includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates may be contained in some street drugs such as nitrite or amyl nitrate also known as “poppers”.
A combination of Viagra and a nitrate can lead to a serious adverse effect such as a low blood pressure. Viagra itself can cause grave adverse effects during sex activity. Thus, if at some point you feel a wave of nausea or feel giddy, numbness, have some pains or pricking in your chest, arms, jaw, or neck, it is necessary to stop the act and consult your doctor immediately.
The use of Viagra should be limited to no more than one dose every 24 hours. If you have twinges of pain while having an erection or it lasts more than several hours call your doctor or seek medical emergency service. The penis may be damaged by a shattering effect of prolonged erection (priapism).
Another adverse effect of using Viagra is vision impairment. It is caused by decreased blood flow to the optic nerve of the eye. This rare serious symptom is occurred mostly in those who already have heart problems, diabetes, high blood pressure, high cholesterol, or eye disorders. Moreover, smokers and seniors can be affected. Vision loss may be caused by other different reasons.
Having noticed sudden vision disorder, recede from taking Viagra and call for medical emergency service.