Doxycycline Sulfonamide Content
Doxycycline does not contain sulfonamide (sulfa) moieties and is classified as a tetracycline antibiotic rather than a sulfonamide antibiotic.
Clinical Implication
Because doxycycline is not a sulfonamide antibiotic, sulfonamide (“sulfa”) allergy labeling generally does not apply to doxycycline based on drug class.
Common Related Medications
Sulfonamide antibiotics include drugs such as sulfamethoxazole and sulfasalazine.
Clarification for Allergy History
Sulfonamide allergy history should be distinguished by the presence of sulfonamide antibiotics rather than by general “sulfa” wording on packaging.