Good manufacturing practices (GMP) are production and testing practices that helps to ensure a quality product. Many countries have legislated that pharmaceutical and medical device companies must follow GMP procedures, and have created their own GMP guidelines that correspond with their legislation. Basic concepts of all of these guidelines remain more or less similar to the ultimate goals of safeguarding the health of the patient as well as producing good quality medicine, medical devices or active pharmaceutical products. In the U.S. a drug may be deemed adulterated if it has passed all of the specifications tests but is found to be manufactured in a condition which violates current good manufacturing guideline. Therefore, complying with GMP is a mandatory aspect in pharmaceutical manufacturing.