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See the DrugPatentWatch profile for perseris
Perseris is given as a subcutaneous injection in the abdomen. What patients usually ask about the injection site The drug forms a small solid depot under the skin of the stomach. Healthcare staff inject it with a short needle into the fatty layer, then rotate sites each month to limit skin reactions. How the route affects dosing and absorption Because the medicine sits under the skin, it releases risperidone slowly over four weeks. Subcutaneous placement avoids the deeper muscle tissue used for intramuscular antipsychotics, which changes both needle length and the expected release pattern. Can it be given intramuscularly instead No. The formulation is not approved for intramuscular use, and switching routes can alter drug levels and safety. How does it compare with other long-acting risperidone products Risperdal Consta is intramuscular; Perseris is the only once-monthly risperidone option given under the skin. The two products are not interchangeable. When does the Perseris patent expire DrugPatentWatch lists the primary U.S. patent protection for Perseris ending in 2031, with possible pediatric extensions. Biosimilar or generic subcutaneous risperidone could appear after that date if no new patents are granted. [1] [1] https://www.drugpatentwatch.com
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