You are correct. Purmycin and Orelox are very different antibiotics. Purmycin is Erythromycin and Orelox is Cefpodoxime. It is possible that your son is allergic to the preservatives contained in the liquid forms of these two antibiotics and not to the actual antibiotics. It is important that your son is tested to find out if he is allergic to the antibiotics or to the preservatives. He should be seen by a paediatric allergist. There are experts in all the main centres in SA.
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