👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Pharmacological Therapies🔖 Free to read, print, and share
Also known as: azithromycin · Zithromax · Z-Pak · erythromycin · clarithromycin · Biaxin
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Use this quick-reference guide to spot, treat, and prevent Macrolides on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Use
Respiratory, PCN-allergic pts
"-thromycin" → protein synth
🩺 Watch
#1 GI upset, N/V, cramping
QT prolongation, hepatotoxic
📌 Avoid
Many drug interactions (CYP450)
↑warfarin, digoxin, statin levels
🎓 Teach
Take with food if GI upset
Report palpitations, dark urine
📚 Macrolides — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Macrolides are bacteriostatic antibiotics used for respiratory infections, atypical pneumonia, chlamydia, and as penicillin alternatives in allergic patients. They are well tolerated but cause GI upset and can prolong the QT interval. The key safety concern is QT prolongation and many drug interactions through CYP450 inhibition.
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Key points
Understand these first
Macrolides are bacteriostatic and inhibit bacterial protein synthesis.
They are a common alternative for patients allergic to penicillin.
GI upset, nausea, and abdominal cramping are the most common side effects, especially with erythromycin.
They can prolong the QT interval and increase arrhythmia risk.
Erythromycin and clarithromycin inhibit CYP450 and raise levels of warfarin, statins, and digoxin.
Azithromycin has a long half-life, allowing short, once-daily courses like the 5-day Z-Pak.
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Nursing priorities
What to do, in order
Assess the medication list for interacting drugs such as statins, warfarin, and digoxin.
Monitor the ECG in patients with cardiac risk for QT prolongation.
Give erythromycin with food if GI upset occurs and as directed for the specific formulation.
Monitor for and report signs of liver dysfunction.
Observe for improvement in the infection and document response.
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Red flags — report now
Escalate immediately
Palpitations, fainting, or signs of arrhythmia require prompt evaluation.
Jaundice, dark urine, or right upper quadrant pain may signal hepatotoxicity and must be reported.
Severe diarrhea may indicate C. difficile colitis and must be reported.
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Labs & values
Numbers to know
AST 10-40 units/L (monitor liver function)
ALT 7-56 units/L (monitor liver function)
Potassium 3.5-5.0 mEq/L (correct before QT-prolonging drugs)
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Patient teaching
What patients must know
Take the medication exactly as scheduled and finish the full course.
Report palpitations, dizziness, or fainting.
Tell your provider about all other medications, especially cholesterol and blood thinner drugs.
Report yellowing of the skin or eyes or severe diarrhea.
❓ Macrolides: NCLEX FAQs
What are the priority nursing interventions for Macrolides?
Assess the medication list for interacting drugs such as statins, warfarin, and digoxin. Monitor the ECG in patients with cardiac risk for QT prolongation. Give erythromycin with food if GI upset occurs and as directed for the specific formulation. Monitor for and report signs of liver dysfunction.
What are the warning signs of Macrolides a nurse must report?
Palpitations, fainting, or signs of arrhythmia require prompt evaluation. Jaundice, dark urine, or right upper quadrant pain may signal hepatotoxicity and must be reported. Severe diarrhea may indicate C. difficile colitis and must be reported.
What do I need to know about Macrolides for the NCLEX?
Macrolides are bacteriostatic and inhibit bacterial protein synthesis. They are a common alternative for patients allergic to penicillin. GI upset, nausea, and abdominal cramping are the most common side effects, especially with erythromycin. They can prolong the QT interval and increase arrhythmia risk.
What patient teaching is important for Macrolides?
Take the medication exactly as scheduled and finish the full course. Report palpitations, dizziness, or fainting. Tell your provider about all other medications, especially cholesterol and blood thinner drugs. Report yellowing of the skin or eyes or severe diarrhea.
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Quick Tip
Macrolides are bacteriostatic and inhibit bacterial protein synthesis.