Swelling is a more severe reaction and should be treated as such. A swelling of the tongue and throat are especially dangerous, as they can block airways and limit breathing. This type of swelling requires immediate medical attention. Allergic reactions to sulfa drugs are the second most common drug allergy after penicillin. If you do have a drug allergy that you are aware of, make your doctors informed as well. As an extra precaution, ask about all prescribed drugs before taking them.
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