Kamagra effervescent tablets are quite good in relaxing the muscles of the penis. The drug's vasodilator effect causes blood to flow more freely in the erectile tissue's caverns. It falls under the family of drugs known as PDE5 blockers. A drug used mostly to treat erectile problems. Kamagra effervescent primarily affects the circulatory system and requires appropriate sexual arousal to take effect. Its effects can be felt within 30-40 minutes, leading in approximately 4 hours of robust erection.