Erythromycin-13C-d3

Erythromycin-13C-d3 is intended for use as an internal standard for the quantification of erythromycin (Item No. 16486) by GC- or LC-MS. Erythromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by targeting the 50S ribosomal subunit, blocking the progression of nascent polypeptide chains.{22680} It is active against a host of bacterial genera, including Streptococcus, Staphylococcus, and Haemophilus (MIC90s = 0.015-2.0 mg/l).{22758} Erythromycin (10-40 mg/kg) dose-dependently inhibits the growth of S. aureus in a mouse model of thigh infection.{42209} It also inhibits the cytochrome P450 (CYP450) isoform CYP3A4 in vitro with IC50 values of 33 and 27.3 µM for ?-hydroxytriazolam and 4-hydroxytriazolam formation, respectively, following administration of triazolam, which is known to be metabolized primarily by CYP3A4.{22760,42210} Formulations containing erythromycin have been used in the treatment of bacterial respiratory and skin infections, pertussis, and a variety of other bacterial infections.