If a drug's strength differs or is mixed with something to reduce its quality, it is considered:

A drug is considered adulterated when its strength differs from what is stated on the label or if it is mixed with substances that degrade its quality. This designation indicates that the drug does not meet the standard of purity or strength that is expected. For instance, if a pharmaceutical product is diluted with impurities or if its active ingredients are compromised, it can lead to negative health outcomes and is therefore labeled as adulterated.

This classification is critical within pharmaceutical regulation as it ensures that drugs available to patients are safe, effective, and of the quality that has been approved by health authorities. The concept of adulteration is central to maintaining industry standards, hence protecting public health and safety.