Which term describes a drug that is filthy, decomposed, or contaminated?

The term that accurately describes a drug that is filthy, decomposed, or contaminated is "adulterated drug." An adulterated drug refers to any medication that has been tampered with or has been compromised in quality due to the presence of unapproved substances, degradation, or unsanitary conditions during manufacturing or handling. This definition is crucial within pharmacy practice because it emphasizes the importance of drug purity and safety for patients.

In contrast, a misbranded drug pertains to misleading labeling, which can include false claims about the drug's identity or its intended use, but it does not specifically address the drug's quality or condition. A controlled substance relates to drugs that are regulated by law due to their potential for abuse and addiction, but again, this does not pertain directly to a drug's physical state. Lastly, psychoactive medication refers to drugs that affect the mind or behavior but does not imply any characteristics of adulteration or contamination.