What might chronic use of a drug lead to?

• A. Decreased effectiveness over time
• B. Immediate side effects
• C. Rapid elimination from the body
• D. Increased metabolism of the drug

Answer: (A)

Chronic use of a drug can lead to decreased effectiveness over time, a phenomenon known as tolerance. As a person continues to take a medication, their body may adapt to its presence, resulting in the need for higher doses to achieve the same therapeutic effect. This occurs because the body becomes less responsive to the drug’s effects due to various physiological changes, such as receptor desensitization or alterations in drug metabolism.

In contrast, immediate side effects are not typically the result of chronic use but rather occur soon after starting a medication or increasing its dosage. Rapid elimination from the body would generally not be related to chronic use; instead, it pertains to how quickly the body can metabolize and excrete a drug following administration. Increased metabolism of the drug may occur with chronic use in some cases, but this is not the sole outcome; it often ties into the concept of tolerance rather than being a direct result of chronicity. Therefore, decreased effectiveness over time is the most likely consequence of prolonged drug use.