Erythromycin

Erythromycin is used as an alternative to tetracycline in the treatment of acne, rosacea, and various types of folliculitis.
It is also used as a broad spectrum antibiotic in patients with infected eczema or infected psoriasis.

Adverse effects:

• QT prolongation when used in combination with terfenadine or astemizole. There is an increased risk for cardiac arrhythmias.
• Decreased clearance of warfarin and cyclosporine.

Dosage:

• Typical dosage for mild to moderate acne is 500 mg po daily for a minimum of 2 to 4 months.
• More severe acne may require up to 1 gm bid.

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