Silagra buy online which is a common medication that is as effective as Viagra. These are PDE5 inhibitors, which include the medication sildenafil as the active component. Sildenafil promotes blood flow into the penis, while you are sexually stimulated, by relaxing the blood vessels in the penis. It functions by reducing PDE5 and boosting the corpus cavernosum’s production of NO (nitric oxide). The medication’s primary advantage is that it may be given 30 to 60 minutes before sexual activity, and its effects persist for over 4 hours. It’s impossible to get an erection without stimulation. Also, this medication is not recommended for women or men before age 18.