Educational Medication GuideRxClass: Macrolide Antibiotic

Azithromycin

Generic Name: Azithromycin

Common Brand Names: Zithromax

Dosage Form:Tablet

Route:Oral

Pregnancy Category:B

Last Reviewed:9/6/2026

Uses & Medical Indications

Treat bacterial infections

Medical Conditions Treated:

Respiratory infections, skin infections, chlamydia

Work Mechanism & Pharmacology

How It Works

Patient Overview of Work Mechanism

Azithromycin stops bacteria from growing and multiplying by jamming their protein-building machinery. Without essential proteins, bacteria cannot survive.

Clinical Mechanism of Action (MoA)

Semisynthetic broad-spectrum azalide macrolide antibiotic. Reversibly binds to the 23S rRNA of the 50S ribosomal subunit of susceptible microorganisms, inhibiting transpeptidation and premature detachment of peptidyl-tRNA from ribosomes, disrupting bacterial protein synthesis.

Primary TargetAzithromycin dihydrate

Therapeutic FamilyAntibacterial

Administration RouteOral

Dosage & Administration Guidelines

Adult Dosage

500 mg day 1, then 250 mg days 2-5

Pediatric Dosage

10 mg/kg day 1, then 5 mg/kg days 2-5

Elderly / Geriatric Considerations

Caution for QT prolongation

Maximum Dose Limit

varies by indication

Renal Impairment:

Caution in severe impairment

Hepatic Impairment:

Caution in severe impairment

Side Effects & Safety Warnings

Common Side Effects

Diarrhea, nausea, abdominal pain

Serious Adverse Reactions

QT prolongation, hepatotoxicity

Contraindications:

History of cholestatic jaundice with prior use

Important Warnings & Precautions:

Risk of QT prolongation

Interactions (Drugs, Food & Alcohol)

Drug-Drug Interactions:

Antacids, Warfarin

Food & Dietary Interactions:

N/A

Alcohol Interaction Warning:

N/A

Pregnancy & Breastfeeding Safety

Pregnancy Safety

Generally safe

Breastfeeding / Lactation

Compatible

Patient Counseling & Practical Advice

How to Take:

Take with or without food

What to Do if You Miss a Dose:

Take as soon as remembered

Recommended Monitoring & Lab Tests:

Resolution of infection

Frequently Asked Questions

Emergency Medical Warning

When to Seek Urgent Medical Attention

Sudden syncope, palpitations, rapid irregular heart rhythm, hives with swelling of the throat.

Emergency Safety Protocol: If an intentional or accidental overdose is suspected, contact your regional Poison Control Center or emergency services immediately. Do not induce vomiting unless strictly advised by emergency healthcare personnel.

Educational Sources & References

Content for Azithromycin was synthesized from standardized public health monographs, official pharmacopoeias, and health authorities:

US FDA — FDA Drug Safety Communication: Azithromycin and Risk of Fatal Heart Rhythms
Infectious Diseases Society of America (IDSA) — Clinical Practice Guidelines for Community-Acquired Pneumonia

Published by: Medi Info Hub TeamLast Updated: 10/19/2026

The information provided on this website is for educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.