Erythromax (Erythromycin Stearate 500mg)“Erythromax contains erythromycin stearate, an antibiotic used to treat bacterial infections such as throat infections, chest infections, skin infections, and some sexually transmitted infections.”Disclaimer: This description is for general information only and should not replace medical advice. Take this medicine only as prescribed by your doctor or pharmacist. Complete the full course, even if you feel better, to prevent the infection from returning.