Cross-reactivity of triptans and sulfonamide antibiotics - a clinically relevant question?

After repeated inquiries from patients whether sulfonamide antibiotic allergy should be considered in the context of taking a triptan, we present here the pharmaceutical background, the chemical structure of triptans, and the clinical relevance in a narrative review. In fact, evidence-based cross-reactivity referring to the well-known allergic reaction of sulfonamide antibiotics has not been described so far.