The best way to avoid an allergic reaction to penicillin is to avoid penicillin and similar antibiotics altogether. If you need an antibiotic, your doctor will help you find that you can tolerate. When a doctor or another doctor prescribes an antibiotic, be sure to check it for penicillin family.
Desensitization
For some infections, it may be necessary for you to take penicillin. In these cases, and if you have had a reaction to penicillin, a skin allergy test is important. If the skin test shows that you are sensitive to penicillin, your doctor may recommend desensitization.
During the desensitization process, which receive small doses, but gradually increasing penicillin by mouth or intravenously. Because desensitization can trigger an allergic reaction is attempted in a controlled environment, usually a hospital, a physician trained in the art, and only when penicillin is absolutely necessary. Your desensitization lasts only as long as you continue taking penicillin. If you stop then you need to take penicillin then have to go through the desensitization process again.
The process of desensitization generally takes one to two days. But it does not work in all cases.
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