It is approved for children 6 months or older and is a good option for kids withpenicillin allergies.
Guidelines for pediatric dosing of azithromycin are based on the condition being treated and the weight of the child.
The drug is available in pill or liquid form.

Verywell / Brianna Gilmartin
Why Is Azithromycin Not Prescribed First?
Macrolide antibiotics are regarded as broad-spectrum antibiotics because they act against a wide range of bacteria.
Azithromycin Pediatric Dosages
Zithromax is taken once daily with a course of one or several doses.
The formula varies by the condition being treated and the number of doses prescribed.
Pharyngitis or Tonsillitis
Pharyngitisis inflammation of thepharynx(throat) andtonsillitisis inflammation of thetonsils.
The most common bacterial cause isStreptococcal pyogenes,the bacteria that causes strep throat.
In such a case, skip the dose and give your child the next dose as usual.
Never double up on doses as this can increase the risk of side effects.
All doses should be given even if your child is feeling better.
If the side effects are severe or persistent, call your healthcare provider.
On rare occasions, a child may experience a severe and potentially life-threatening allergy known asanaphylaxis.
Depending on the condtion being treated, it may be given over one to five days.
The dose is calculated based on the child’s weight in kilograms.
Common side effects include upset stomach, diarrhea, and nausea.
Pfizer Laboratories.Labeling for ZITHROMAX-azithromycin dihydrate tablet, film coated; ZITHROMAX-azithromycin dihydrate powder, for suspension.
National Institute on Deafness and Other Communication Disorders.Ear infections in children.
American College of Allergy, Asthma & Immunology.Sinus Infection.
Metlay JP, Waterer GW, Long AC, et al.Diagnosis and treatment of adults with community-acquired pneumonia.
2019;200(7):e45-e67.
doi:10.1164/rccm.201908-1581ST
Kalra MG, Higgins KE, Perez ED.Common questions about streptococcal pharyngitis.Am Fam Physician.
2016;94(1):24-31.