Patient 5. A 58-year-old woman was hospitalized with a generalized itchy vesiculopapular eruption with severe mucosal affection. She was treated with systemic corticosteroids and antibiotics, and the cutaneous lesions cleared within 2±3 weeks. Some weeks before this outbreak, the patient had taken several drugs, including tetrazepam and nabumetone, for lumbar arthralgia. Patch tests. All ®ve patients were patch tested with the GEIDC standard series, tetrazepam, diazepam, bromazepam, and lorazepam, all at 1% pet. Other drugs, such as nabumetone and diclofenac, were also tested. Reading was carried out at 48 and 96 h. Patch tests with tetrazepam were positive (+/++) in all cases and negative with the other substances. Skin tests. Prick and intradermal tests were performed with tetrazepam and diazepam, and read at 15 min and 48 and 96 h, with negative results.Oral challenge tests. Single-blind oral challenge tests with increasing doses of diazepam until an accumulative dosis of 8.75 mg was reached were performed in patients 1, 2, and 3 without ill effect. Patient 4, who treated herself without medical control, reported good tolerance of diazepam and lorazepam. Oral challenge with tetrazepam was not done in any case. Oral challenges with the NSAIDs involved in patients 2, 4, and 5 were negative. We present ®ve cases of generalized cutaneous reactions to tetrazepam. Patients 1±4 were diagnosed with systemic contact dermatitis, and patient 5 was diagnosed with Stevens-Johnson syndrome. Positive patch tests to tetrazepam con®rm the value of this tool in the diagnosis of adverse cutaneous reactions induced by this drug. In our patients, patch tests with other benzodiazepines were negative, and four patients tolerated oral administration of diazepam, a benzodiazepine with great structural homology with tetrazepam. These data, in agreement with those of other authors (1, 3), indicate that there is no cross-reactivity among benzodiazepines. However, Ka Èmpgen et al. (4) found positive patch tests to diazepam in one patient with tetrazepam allergy. Garcia Bravo et al. (2) also found positive patch tests be explained by concomitant sensitization.Since we need more data about crossreactivity among benzodiazepines, patch tests with other benzodiazepines are useful in order to offer a therapeutic alternative, but, in our opinion, tolerance must always be con®rmed by oral challenge.