Nokea
During which phase of pharmacokinetics could a significant drug-drug interaction occur, resulting in one drug stimulating or blocking the metabolism of the other drug?
Correct Answer: C
Rationale: During biotransformation, a drug may be metabolized quicker if taken at the same time as another drug, and higher doses of the drug will be needed to achieve the desired effect. During absorption, one drug can prevent or accelerate absorption of the other drug. During distribution, one drug competes for the protein-binding site of another drug so the second drug cannot be transported to the reactive tissue. During excretion, one drug competes for excretion with the other drug, leading to accumulation and toxic effects of one of the drugs.