The nurse is preparing to administer medications to a 54-year-old client. Which medications taken would be affected by the first-pass effect? (Select All that Apply.)
Morphine 2mg IV (Intravenously)
Diphenhydramine (Benadryl) 25mg Tablet
Famotidine 10mg Tablet
Nitroglycerin 4mg Sublingual Tablet
Nitroglycerin 10mg Sublingual Tablet
Acetaminophen 325mg Capsule
Correct Answer : B,C,F
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.
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Correct Answer is C
Explanation
A. Morphine is a category C medication, which means it may be used if the benefits outweigh the risks; it is not contraindicated in pregnancy.
B. Famotidine (Pepcid) is also a category B medication and is generally considered safe to use during pregnancy.
C. Misoprostol (Cytotec) is classified as category X due to its association with causing uterine contractions and the potential for fetal harm; thus, it should be avoided during pregnancy.
D. Ibuprofen (Advil) is a category C medication, and while it is not typically recommended in the third trimester, it is not classified as category X.
Correct Answer is C
Explanation
A. Beta blockers are used to manage blood pressure and heart rate but are not effective in reducing niacin-induced flushing.
B. Calcium channel blockers help to relax blood vessels but do not address the flushing side effect caused by niacin.
C. NSAIDs, like aspirin, can help reduce the flushing associated with niacin. This flushing occurs due to prostaglandin release, which NSAIDs can inhibit.
D. While fibric acid derivatives are used to lower cholesterol, they do not alleviate the flushing side effect of niacin.