Serum/plasma concentration of risperidone (antipsychotic medication)

Why This Test Is Done

Your doctor may order this test if you’re taking risperidone to check if the medication is working properly, to adjust your dose, or to detect potential side effects. It’s especially important if you’re experiencing unusual symptoms like dizziness, rapid heartbeat, or unusual movements.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or vein to draw blood. If you’re on a long-term medication like risperidone, your blood will be tested at regular intervals to ensure safety and effectiveness.

What the Results Mean

Results are typically reported as a concentration in nanograms per milliliter (ng/mL). While reference ranges vary by lab, lower-than-expected levels may indicate insufficient medication, while very high levels could signal toxicity or improper dosing.

Common Reasons for Testing

This test is often done to: verify therapeutic drug levels, manage side effects, assess compliance, or monitor for drug interactions with other medications you’re taking.