Guaranteed erections with Viagra

Viagra inhibits the enzyme PDE5 that can lead to erectile dysfunction.

Cyclic GMP is the substance that is produced during sexual arousal and causes vascular and muscular changes that eventual lead to an erection. An enzyme called Phosphodiesterase type-5 (PDE5), that occurs naturally in erectile tissue, can break down GMP, resulting in impotence.

Therefore, men who produce too little cyclic GMP or too much PDE5 have problems obtaining and maintaining an erection.

Viagra's affect is to inhibit PDE5, allowing the GMP to take effect.

Dosage:
Take 25mg to 100mg (50mg doses being the average) up to one hour before sexual intercourse. The affects of Viagra will last, on average, for up to 4-hours.

Side effects:
Headache, flushing and dyspepsia. There have been some reports of disturbances, dizziness, and nasal congestion. Other rarer adverse effects reported include diarrhoea, muscle pain, skin rashes, and urinary or respiratory-tract infection. Viagra is contra indicated with organic nitrates. These are drugs that are often used to treat heart conditions such as hypotensive conditions, (low blood pressure). Viagra appears to potentiate the effects of nitrates and therefore the two must not be taken concurrently. Furthermore, caution is advised for any patient using Viagra who has a heart problem, even if they are not using nitrates for the condition.