The federal drugs association is known around the world to take high precautions and thorough measures where the testing and evaluation of any type of medication and or other treatments are concerned. The FDA is also known to first test and check up on all medications that are made before they are sent into the market and released for public use. The FDA specifically will check up on medications, their manufacturers and their addictive qualities and will allow their dosage and availability to be in accordance to safety. The FDA is very eager on re testing all medications that are in the market so as to set an up to date standard for the future production of those medications.

The FDA is especially concerned with the clinical use of several drugs and has allowed the release of Metoprolol - TOPROL XL in the US, Australia and UK under controlled prescription based sale. TOPROL XL was first put through a series of clinical tests to check the chemical content and then for a trial period in the market in the form of pills. The manufacturers of TOPROL XL are also then given a thorough investigation and checked for up to date equipment and all other standards. The sale of Metoprolol is strictly to be done on the basis of a registered prescription and also on the basis of prior prescription. Metoprolol has been checked for any extra content which may be addictive in nature.