Ritalin has not been studied in patients with renal impairment. Therefore, if you have kidney problems or any other health concerns, it is essential to consult with your doctor or pharmacist before taking Ritalin. They can provide you with guidance on the appropriate dosage and inform you about potential side effects, all while considering your specific health condition. It’s important to ensure that Ritalin is safe and effective for your individual needs, and professional medical advice is key in this process.