How to Treat Mycoplasma Infection in Children?

My child has mycoplasma infection, weighing 18 kg, and has received 1.5 bottles of Erythromycin (30,000 units per bottle). I consulted two doctors; one suggested taking azithromycin orally, while the other believed it was unnecessary. I’m not sure what to do. When should oral medication be taken, and how much time should it be apart from the IV? Do I need to inject it for half a month? Thank you.
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