What is the definition or description of: risperidone drug level?

Risperidone Level: This is the level of the drug and it's active metabolites measured usually in blood. It can be useful when evaluating someone who has either less of a response to the medication than would be expected, or more side effects than are typical with the medication.

Blood test: A Risperidone drug level refers to the blood test that measure the concentration of the antipsychotic medication, risperidone. Generally a level is not necessary and the medication is dosed based on response to its maximum. One would maybe get a level if adherence issues arise or metabolism issues are suspected.