Apcalis SX Oral Jelly is used for the treatment of erectile dysfunction in men. Apcalis belongs to the family of Phosphodiesterase type 5 inhibitors. Apcalis works by relaxing blood vessels in the penis which allows blood to flow into the penis regions and maintain a longer erection. The onset time of Apcalis is as fast as 30 minutes and the effect lasts for 36 hours giving you enough time to plan out and enjoy your sexual fantasies.