Erythromycin is a potent macrolide inhibitor of CYP3A4 with antiinflammatory and prokinetic properties. Macrolides belong to a group of antibiotics that bind to the 50S ribosomal subunit and inhibit protein synthesis. Erythromycin is derived from Streptomyces erythreus and has been shown to inhibit NF-κB transcriptional activation, which leads to the inhibition of cytokine gene expression of IL-8 and lL-6. This mechanism was shown to occur via calcineruin-independent signaling T lymphocytes.