title: Desensitization to co-trimoxazole in a patient with fixed drug eruption.
abstract: Although co-trimoxazole is a major cause of fixed drug eruption, there are no reports in the literature of desensitization protocols for co-trimoxazole in such patients. We present the case of an 85-year-old woman with a fixed drug eruption to co-trimoxazole. Since she needed co-trimoxazole therapy for treatment of infection of a prosthetic hip by Staphylococcus aureus, she underwent allergy testing with co-trimoxazole and its components sulfamethoxazole and trimethoprim. Allergy tests were all negative and a diagnosis of nonallergic hypersensitivity reaction to co-trimoxazole was made. Based on previous experience, we decided to attempt a desensitization protocol with co-trimoxazole. After 10 days, the patient could receive 800 mg of sulfamethoxazole and 160 mg of trimethoprim twice a day and no adverse reactions were observed. We suggest that desensitization protocols with co-trimoxazole be considered in patients with fixed drug eruption, especially when there are no alternative drugs.
authors: Department of Allergology, Università Cattolica del Sacro Cuore, Rome, Italy. allergologia@hotmail.com
authors: G
authors: G
authors: Patriarca
authors: D
authors: D
authors: Schiavino
authors: A
authors: A
authors: Buonomo
authors: A
authors: A
authors: Aruanno
authors: G
authors: G
authors: Altomonte
authors: E
authors: E
authors: Nucera
mesh_terms: D000369:Aged, 80 and over; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000009:adverse effects*; D003888:Desensitization, Immunologic; D003875:Drug Eruptions / Q000209:etiology / Q000628:therapy*; D005260:Female; D006801:Humans; D015662:Trimethoprim, Sulfamethoxazole Drug Combination / Q000008:administration & dosage / Q000009:adverse effects*
chemical_list: D000890:Anti-Infective Agents; D015662:Trimethoprim, Sulfamethoxazole Drug Combination