The serum Procyclidine (Kemadrin) level analysis using liquid chromatography–tandem mass spectrometry (LC-MS/MS) is a laboratory test used to measure the concentration of Procyclidine in the blood. Procyclidine is an anticholinergic medication commonly used to treat symptoms of Parkinson’s disease and some side effects of antipsychotic drugs. This test is performed to assess the effectiveness of the treatment and adjust the appropriate dosage, as the results can help doctors avoid potential side effects resulting from inappropriate doses. A blood sample is taken and analyzed using advanced techniques to ensure accurate results. This information helps doctors make informed decisions regarding treatment management and improve patients’ quality of life.