Question 1

What is azithromycin used for in children?

Accepted Answer

Azithromycin is used for *community-acquired pneumonia (atypical and typical), pharyngitis (in penicillin-allergic patients), pertussis (whooping cough), otitis media (as an alternative), and chlamydial infections* in adolescents. It is typically second-line and should be reserved for appropriate indications.

Question 2

Why is azithromycin given for only 5 days?

Accepted Answer

Azithromycin has an exceptionally long *tissue half-life* of 2–4 days and accumulates in intracellular compartments. After a 5-day course, *therapeutic tissue concentrations persist for up to 10 days* — equivalent to a much longer course of a conventional antibiotic with a shorter half-life.

Question 3

Can azithromycin cause heart problems?

Accepted Answer

Yes. Azithromycin can prolong the **QT interval** on the ECG and, in susceptible individuals, may trigger *Torsade de Pointes* — a potentially fatal cardiac arrhythmia. Risk factors include QT prolongation, electrolyte abnormalities, and concurrent use of other QT-prolonging drugs. Screen all patients for these risk factors before prescribing.

Question 4

Is azithromycin safe in infants under 6 months?

Accepted Answer

Azithromycin use in infants under **6 months** requires specialist guidance. It has been associated with *infantile hypertrophic pyloric stenosis (IHPS)* in neonates and young infants. For most paediatric indications, the drug is only approved from 6 months of age.

Question 5

What is the difference between azithromycin and amoxicillin for pneumonia?

Accepted Answer

Amoxicillin covers *typical* respiratory pathogens (S. pneumoniae, H. influenzae) and is first-line for most community-acquired pneumonia in children. Azithromycin covers *atypical* pathogens (Mycoplasma, Chlamydophila) and is used when these organisms are suspected, or as an alternative when amoxicillin is contraindicated.

Question 6

What foods interact with azithromycin?

Accepted Answer

**Capsule formulations** should be taken on an *empty stomach* — food substantially reduces absorption. **Tablets and suspensions** can generally be taken with food without a significant reduction in bioavailability. Always check the specific product information for the formulation dispensed.

Question 7

How should I store reconstituted azithromycin suspension?

Accepted Answer

Reconstituted azithromycin suspension should be stored at *room temperature or refrigerated* and used within **10 days**. Shake well before each use. Do not freeze the suspension. Discard any remaining suspension after the course is complete.

Azithromycin
Dose Calculator

Azithromycin — Paediatric Dose Calculator

Azithromycin
Dose Calculator

Azithromycin — Paediatric Dose Calculator