Which of the following drug does NOT require therapeutic drug monitoring:
Show Hint
- Digitoxin
- Phenytoin
- Gentamicin
- Acetaminophen
The Correct Option is D
Approach Solution - 1
Step 1: Understanding therapeutic drug monitoring (TDM). Therapeutic drug monitoring is used for drugs with a narrow therapeutic index, where small changes in dosage can lead to toxicity or subtherapeutic effects.
Step 2: Analysis of given drugs. - (A) Digitoxin: Requires TDM because of its narrow therapeutic index and risk of toxicity, especially in cardiac patients.
- (B) Phenytoin: Requires TDM due to its non-linear pharmacokinetics and risk of toxicity at high serum levels.
- (C) Gentamicin: Requires TDM to avoid nephrotoxicity and ototoxicity, especially in patients with renal impairment.
- (D) Acetaminophen: Does not require routine TDM as it has a wide therapeutic index and predictable pharmacokinetics, except in cases of suspected overdose.
Step 3: Conclusion. Acetaminophen is safe for most patients at therapeutic doses, making it the correct answer as the drug that does not require TDM.
Approach Solution -2
The question asks which of the four drugs listed does NOT require therapeutic drug monitoring. Let's check the safety margin of each one.
- Digitoxin: Digitoxin has a narrow gap between the dose that helps the heart and the dose that becomes toxic, so blood levels are monitored closely, especially since toxicity can cause dangerous heart rhythm problems.
- Phenytoin: Phenytoin's blood levels do not rise in a simple straight-line relationship with dose, meaning a small increase in dose can push levels sharply higher and into the toxic range, so its levels are routinely checked.
- Gentamicin: Gentamicin can damage the kidneys and the inner ear if blood levels climb too high, so monitoring is standard practice, particularly in patients whose kidney function is already reduced.
- Acetaminophen: At normal recommended doses, acetaminophen has a wide gap between an effective dose and a harmful one, and its levels in the blood behave predictably. Routine monitoring is not needed unless there is a suspected overdose, which is a very different situation from ongoing dose monitoring.
Digitoxin, phenytoin, and gentamicin all have a narrow safety margin or unpredictable blood levels that make monitoring necessary, while acetaminophen's wide margin and predictable behavior at normal doses mean it does not need the same routine checks.
So the correct answer is Acetaminophen.
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