What are the alternatives if one is allergic to amoxillin, ampicillin, erythromycin and clindamycin?

See an allergist: There are many alternative antibiotics if you need one. The specific one will depend on the infection; your md can discuss this with you at that time. I also recommend seeing an allergist. They can determine if reactions you had were truly due to antibiotics, if you've lost your allergy over time, etc. They can also help you take those meds safely without reaction if there's no alternative drug.

See below: It depends on the type of penicillin allergy. If just a rash you can take cephalosporins like keflex. If hives, throat swelling or anaphylaxis you cannot take them. Erythromycin frequently causes nausea and vomiting-not an allergy. If this is the reaction you can take zithromax. In any case you can take Doxycycline trimethoprim/ sulfamethoxazole(septra/bactrim) or levoquin, .