Erythromycin Dosage and Administration

Dosage in Adults

• The Centers for Disease Control and Prevention (CDC) recommends 500 mg four times a day for 7 days for Chlamydia trachomatis infections 1, 2, 3
• For pertussis (tos ferina), the recommended dose is 2 g daily divided into 4 doses for 14 days 4
• For urethritis, the CDC recommends 500 mg four times a day for 7 days 2, 5

Dosage in Children

• For Chlamydia trachomatis infections in children over 1 month, the recommended dose is 40-50 mg/kg/day divided into 4 doses for 14 days (maximum 2 g/day) 4
• For children under 1 month, azithromycin is recommended as the first option due to the risk of infantile hypertrophic pyloric stenosis (IHPS) 4

Dosage in Pregnancy

• The CDC recommends avoiding erythromycin estolate during pregnancy due to the risk of hepatotoxicity 3, 6

Formulations and Special Considerations

• Erythromycin base can be taken at 500 mg four times a day for 7 days 3, 6
• Erythromycin ethylsuccinate can be taken at 800 mg four times a day for 7 days 3, 6

Adverse Effects and Precautions

• Common adverse effects include gastrointestinal symptoms (nausea, vomiting, abdominal pain, diarrhea) and skin rashes 4
• High doses of erythromycin increase the risk of adverse effects 4
• There is an increased risk of infantile hypertrophic pyloric stenosis (IHPS) in neonates during the month following erythromycin administration 4
• Erythromycin should not be taken concurrently with astemizole, cisapride, pimozide, or terfenadine 4

Treatment Efficacy

• Completing the recommended treatment duration is essential to avoid relapses, especially in pertussis where 14 days are recommended 4