If you take four 5mg ritalin pills for the first time and are urine tested 20 minutes later will your drug test be clean? thank you?

You did not say which form of Ritalin you are taking, other meds you are taking and exactly what the test is measuring. I would ask the la after you know that information., But in you the best way to find out would be to take the one you usaually test and then get urine or blood test. You can go to Drugs.com and look up how fast is is adsorbed and what is the half life. So not a simple question