Pills dissolve believe everyone in the University curriculum experiment has ever seen.

But there is a part of the drug factory for the production of pills or the exterior of the capsule is not dissolved in the body and the discharge, by itself the agent design is to make the users taking daily just a grain of it is sufficient or have other special considerations. So usually labeled as XL, EL, EX, LA, CR, etc., because it is the pharmaceutical factory registration name is different, this is because the commercial marketing considerations, but refers to long-term(Prolonged-release,Extended release etc.)

But not all long-acting(Prolonged-release)drug the outside will not dissolve, mainly the drug companies drug design.

Translated by Yandex.Translate and Global Translator