Cobra tablets also contain the active ingredient sildenafil. However, not only (as usual) with a lot of 100mg, but 120mg (20% more). Sildenafil is the active ingredient that has made Viagra world-famous and is indispensable nowadays. Millions of men worldwide rely on the „miracle pills“ to combat their erectile dysfunction (impotence). The active substance sildenafil belongs to the group of PDE-5 inhibitors. It blocks the enzyme phosphodiesterase-5 and thus delays the degradation of cyclic guanine monophosphate (cGMP). The blood flows through it better into the erectile tissue of the penis and leads to an erection. Sildenafil causes more cGMP to remain in the bloodstream and increase muscle relaxation. However, it must be pointed out again and again that it comes through the active ingredient Sildenafil not „automatically“ to an erection! The body has to be aroused, otherwise there will be no erection. It is recommended to take a Cobra tablet about 20 – 30 minutes before having sex. After about 20 minutes, the desired effect begins and lasts for about 8 hours.