What Viagra is used for

Viagra is used to treat erectile dysfunction, more commonly known as impotence, in men. This is when a man cannot get, or keep, a hard erect penis suitable for sexual activity.
Viagra belongs to a group of medicines called phosphodiesterase type 5 inhibitors.
It works by relaxing the blood vessels in your penis when you are sexually excited. This allows blood to flow into your penis, allowing you to get an erection in the natural way.
Viagra will work only if you are sexually excited.
Viagra will not increase your sex drive.
Viagra is not for use in women.
This medicine is available only with a doctor's prescription.

Is Sildenafil Viagra 25mg Enough? 

Viagra 25mg is slightly less effective than 50mg and 100mg, but has the bottom risk of side effects and interactions with other medications. A doctor may recommend this dosage if you tried Viagra 50mg and located that it worked for you, but you furthermore may had mild side effects.Researchers found that sildenafil (the active ingredient in Viagra) was linked to a rise in ejaculation time in men suffering from ejaculation. Another study from 2005 found that men who used sildenafil experienced a tiny low increase in time before ejaculation.Viagra 25mg Tablets Price In Pakistan.