A nurse reads in a drug information guide that PO morphine has a high first-pass effect. Which of the following would the nurse expect?
The drug will be most effective when given orally.
The drug will be more effective when given in a non-enteral route.
The drug is excreted by the kidneys at a slower rate than most medications.
The kidney will metabolize some of the drug before it reaches the bloodstream.
The Correct Answer is B
A. A high first-pass effect means that a significant amount of the drug is metabolized by the liver before reaching systemic circulation, making oral administration less effective.
B. Morphine with a high first-pass effect will be more effective when administered via non-enteral routes, such as IV or subcutaneous, to bypass the liver's initial metabolism.
C. The first-pass effect does not influence the kidney’s rate of excretion but rather the liver’s initial metabolism of the drug.
D. The liver, not the kidneys, is responsible for the first-pass metabolism, which occurs before the drug reaches systemic circulation when taken orally.
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Correct Answer is A
Explanation
A. Ciprofloxacin is a fluoroquinolone antibiotic that is effective against Bacillus anthracis, the bacterium that causes anthrax. It is often used as a first-line treatment for exposure to anthrax, especially in its inhalational form.
B. While amoxicillin/clavulanate can treat certain infections, it is not the preferred treatment for anthrax. It is less effective against anthrax compared to ciprofloxacin.
C. Nystatin is an antifungal medication used to treat fungal infections and is not indicated for anthrax treatment.
D. Metronidazole is primarily used for anaerobic bacterial and protozoal infections, making it inappropriate for treating anthrax.
Correct Answer is ["B","C","F"]
Explanation
A. Morphine administered intravenously bypasses the gastrointestinal tract and liver, avoiding the first-pass effect entirely.
B. Diphenhydramine in tablet form is absorbed through the gastrointestinal tract and undergoes significant first-pass metabolism in the liver, affecting its bioavailability.
C. Famotidine in tablet form is also subject to first-pass metabolism, which can reduce its effectiveness.
D. Nitroglycerin sublingual tablets are designed to bypass the first-pass metabolism by being absorbed directly into the bloodstream through the mucous membranes.
E. The same applies to nitroglycerin 10mg sublingual tablets; they also avoid the first-pass effect due to sublingual administration.
F. Acetaminophen is taken orally and undergoes first-pass metabolism in the liver, which can significantly affect its overall bioavailability.