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is erythromycin and doxycycline same class are erythromycin and doxycycline related is doxycycline related to erythromycin is clindamycin and erythromycin in same class doxycycline other drugs in same class is doxycycline and tetracycline same class is penicillin and erythromycin same class is erythromycin and clindamycin the same
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