Sidenafil, commonly known by the trade name viagra is an oral medication used for the treatment of erectile dysfunction (ED).
The function of Viagra is relatively simple – it relaxes the muscle and increases the blood flow to the penis. An erection is nothing more than blood flow to the penis. When blood flow is weak so is the erection. If we increase blood flow we increase the strength of the erection and the ability to maintain it.
The specifics of action involve the binding of nitric oxide to the guanylate cyclase receptors, which increases cGMP levels. This produces a smooth muscle relaxation, which in turn opens the pathway for increased blood flow. Viagra belongs to the class of drugs known as cGMP Specific Phosphodiesterase type 5 or PED5.
Important note: Viagra as well as other PED5 medications cannot cause or promote an erection without sexual stimulation. They do not have an effect on libido. The subject must be sexually aroused to obtain an erection. In the case of Viagra the problem for the subject is that the desire is there but the erection is not found. Viagra should reverse this issue if blood flow is the cause.
The side effects of Viagra, the most commonly reported is abnormal or blurred vision with approximately 2.5% of users experiencing this effect. If vision issues occur users are urged to discontinue and find alternative options. All possible side effects of Viagra include:
- Vision disturbances
- Loss of hearing (sudden) or ringing in the ears
- Edema (hands, ankles, feet)
- Shortness of Breath
- Light Headed
- Stuffy Nose
- Back Pain
- Memory Loss
The side effects of Viagra do not appear to occur in most men.
Viagra is taken orally , it is available in numerous dosing strengths from 25mg, 50mg and 100mg per tablet. However, many compounding pharmacies also manufacture Sildenafil with their own dosing ranges.
Recommended use is to take Viagra 30-60 minutes before sexual activity for the best effect with the total effect of the pill lasting for 4 hours, approximately.