Erythromycin, clarithromycin, azithromycin.

Bacteriostatic not bacteriocidal, but doesn’t necessarily mean inferior.

Broad spectrum, including things that aren’t even bacterial! eg Bordetella pertussis, syphilis.

Diarrhoea and vomiting as main side effects, not an allergy as such. True allergy is virtually unheard of! Other important issues:

• Risk of pyloric stenosis in neonates
• Prolong QT, so beware other things that also prolong QT including electrolyte disturbance