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Azithromycin is a macrolide primarily prescribed to treat bacterial infections, including community-acquired pneumonia and sexually transmitted infections. This activity addresses the indications, mechanism of action, and contraindications of azithromycin, emphasizing critical factors such as administration, adverse event profile, toxicity, monitoring, and drug interactions. This review provides healthcare professionals with essential insights for optimizing azithromycin therapy by tailoring treatment to patient-specific needs, minimizing adverse effects, and ensuring safety in diverse populations. A deeper understanding of azithromycin’s pharmacological properties enables informed prescribing decisions and appropriate dosing strategies. This program underscores the role of interprofessional collaboration, clarifying roles, and enhancing coordination within the healthcare team to support effective management of azithromycin therapy for bacterial infections. By equipping healthcare professionals with evidence-based knowledge, this activity fosters improved patient outcomes through personalized and effective treatment plans, advancing standards in care related to azithromycin administration. Objectives: Identify the mechanism of action and appropriate administration methods of azithromycin. Assess the adverse effects and contraindications associated with azithromycin therapy. Evaluate the appropriate monitoring strategies for patients receiving azithromycin therapy. Implement effective collaboration and communication among interprofessional team members to improve outcomes and treatment efficacy for patients who might benefit from azithromycin therapy. Access free multiple choice questions on this topic.

Signs and Symptoms of Overdose Azithromycin, like other macrolides, is associated with QTc prolongation. Azithromycin administration can result in potentially lethal arrhythmias such as torsades de pointes. This is particularly true for patients with a history of QTc interval perturbation, cardiac arrhythmia, or concomitant use of other medications associated with QTc prolongation. In animal studies, although azithromycin was associated with similar QTc prolongation compared to other macrolides, it seemed to have a negligible proarrhythmic effect.[64] While significant hepatoxicity resulting from azithromycin is relatively rare, macrolides are known to cause mixed hepatocellular/cholestatic drug-induced liver injury. With prompt discontinuation of azithromycin, liver injury is almost always reversible with minimal residual impairment. Often, azithromycin-induced hepatotoxicity has associated immunoallergenic features such as rash, fever, and eosinophilia. Severe reactions, such as anaphylaxis, SJS, and drug reaction with eosinophilia and systemic symptoms (DRESS), are rare.[65] Gastrointestinal toxicity is common but typically mild, and most patients can complete the prescribed course of azithromycin. This toxicity is the result of azithromycin’s activation of pro-motility receptors in the gastrointestinal tract. Management of Overdose There is no antidote for azithromycin overdose. General symptomatic and supportive measures should be instituted as necessary.

Although azithromycin is a well-tolerated and effective antimicrobial agent with many clinical indications, it is often inappropriately prescribed, particularly in the primary care setting. Several large retrospective cohort studies involving high levels of inappropriate antimicrobial prescribing overall singled out azithromycin as the most frequently misused drug.[66][67][68][69] Azithromycin is frequently prescribed when there is no clinical indication for antimicrobials, and in many instances, azithromycin is not first-line therapy (e.g., acute otitis media).[66][70] Azithromycin is frequently prescribed when a narrow-spectrum β-lactam (eg, amoxicillin) is the indicated first-line therapy.[66] Increasing resistance to azithromycin, particularly among S pneumoniae isolates, makes the widespread use of azithromycin for upper respiratory illness particularly concerning.[71][72] Broad-spectrum antimicrobial therapy for upper respiratory infection is also associated with increased rates of adverse effects compared with narrow-spectrum agents.[73][74] One possible association with high rates of azithromycin prescription is patient-reported penicillin allergy.[75] Macrolides, particularly azithromycin, are preferred to β-lactam drugs for many clinical indications. Researchers found 12.8% of patients in an extensive electronic medical records database have a penicillin allergy listed in 1 large cohort.[76] Patients with a reported penicillin allergy are as much as 4 times more likely to be prescribed a macrolide antimicrobial.[75] However, a detailed history of a patient’s adverse reactions to penicillin, paying close attention to features suggestive of IgE-mediated hypersensitivity (eg, urticaria, anaphylaxis), is often sufficient to clarify and possibly remove a listing of penicillin allergy.[77] Patients with more concerning histories may be administered allergy testing or referred to an allergy specialist. Lastly, providers should know the low cross-reactivity rates with cephalosporins (especially third and later-generation agents) and other β-lactams in penicillin allergy.[78]

One possible association with high rates of azithromycin prescription is patient-reported penicillin allergy.[75] Macrolides, particularly azithromycin, are preferred to β-lactam drugs for many clinical indications. Researchers found 12.8% of patients in an extensive electronic medical records database have a penicillin allergy listed in 1 large cohort.[76] Patients with a reported penicillin allergy are as much as 4 times more likely to be prescribed a macrolide antimicrobial.[75] However, a detailed history of a patient’s adverse reactions to penicillin, paying close attention to features suggestive of IgE-mediated hypersensitivity (eg, urticaria, anaphylaxis), is often sufficient to clarify and possibly remove a listing of penicillin allergy.[77] Patients with more concerning histories may be administered allergy testing or referred to an allergy specialist. Lastly, providers should know the low cross-reactivity rates with cephalosporins (especially third and later-generation agents) and other β-lactams in penicillin allergy.[78] Through antimicrobial stewardship, healthcare professionals can ensure appropriate antimicrobial administration, including azithromycin. Adhering to evidence-based guidelines and educating patients reduce resistance and optimize treatment outcomes. Clinicians should prescribe azithromycin judiciously and adhere to IDSA guidelines. Clinicians working with or supervising non-physician prescribers should ensure that all prescriptions accord with evidence and guideline-based practice.[68] Additionally, patients requesting antimicrobial therapy when it is not necessary or sharing concerns about drug allergies should be provided with education and appropriate follow-up. Nurses can address patient questions and facilitate continuity of care. Pharmacists are an invaluable resource for helping providers select the most appropriate antimicrobial agent, dosing, and duration of treatment. They can also help providers and patients avoid interactions between azithromycin and other drugs that affect the QTc interval. While azithromycin is a safe and effective antimicrobial drug, practitioners must prescribe it appropriately. The appropriate choice of antibiotic enhances treatment, supports public health, and avoids placing patients at unnecessary risk of adverse effects. An interprofessional team approach and communication among clinicians, pharmacists, and nurses are crucial to decreasing potential adverse effects, improving disease course, and improving outcomes for patients receiving azithromycin.