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The article you requested is

Allergic Reaction to Depot Risperidone but Not to Oral Risperidone

J Clin Psychiatry 2005;66(7):949-949 [letter]

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Sir: Oral risperidone is an effective and well-tolerated atypical antipsychotic1 that has been in widespread clinical usage for over 10 years. In recent years, a long-acting injectable form of depot risperidone with a delivery system different from other depot antipsychotics became available in the United States following several years of marketing in other countries. This formulation consists of risperidone microencapsulated in 7525 polylactide-co-glycolide (PLG) at a concentration of 381 mg of risperidone per gram of microspheres2; the PLG slowly hydrolyzes to release risperidone, allowing administration every 2 weeks​