Metoprolol, a drug manufactured by three different companies – Sandiz, Ethex and Par – is a selective betai-adrenoreceptor blocking agent and is used in the treatment of a wide range of symptoms and diseases. Metoprolol is very beneficial in improving the cardiovascular system and thus used in treating hypertension. Next to this, Metoprolol is also used in conditions such as migraine headaches, hyperthyroidism, as well as in treating anxiety related problems.