Question: what the difference between clarithromycin and erythromycin?
Answer: Clarithromycin is an erythromycin derivative with slightly greater activity than the parent compound. Tissue concentrations are higher than with erythromycin. Clarithromycin is also used in regimens for Helicobacter pylori eradication. Spiramycin is also a macrolide which is used for the treatment of toxoplasmosis.