Which statement best describes the outcome of biotransformation?

Which statement best describes the outcome of biotransformation?

• A. Drugs are converted into less active or inactive forms
• B. Drugs become more active always
• C. Biotransformation only occurs in the kidneys
• D. Biotransformation occurs only after excretion

Answer: (A)

Biotransformation is the body's enzymatic modification of drugs, mainly in the liver, to make them easier to eliminate. This process usually converts lipophilic drugs into more polar metabolites, which often have reduced or lost pharmacologic activity, enabling their excretion. Because of this, the statement that drugs are converted into less active or inactive forms captures the typical outcome of biotransformation. There are exceptions—some metabolites can be more active or toxic, and some drugs are prodrugs that become active after metabolism—but the common result is decreased activity and enhanced clearance. It’s not confined to the kidneys, and it occurs before excretion, not after.

Biotransformation is the body's enzymatic modification of drugs, mainly in the liver, to make them easier to eliminate. This process usually converts lipophilic drugs into more polar metabolites, which often have reduced or lost pharmacologic activity, enabling their excretion. Because of this, the statement that drugs are converted into less active or inactive forms captures the typical outcome of biotransformation. There are exceptions—some metabolites can be more active or toxic, and some drugs are prodrugs that become active after metabolism—but the common result is decreased activity and enhanced clearance. It’s not confined to the kidneys, and it occurs before excretion, not after.