The amount of time Concerta stays in your system depends on the form of the drug taken, but can be up to 90 days for a hair-based drug test, notes PassYourDrugTest.com. Concerta is found in some forms of tobacco, as well as some prescription medications. The half-life of Concerta in the form of methylphenidate is approximately 3.6 hours, according to RxList.
For urine tests and saliva tests, Concerta can be detected for 1 to 2 days in the prescription form or 1 to 3 days in the tobacco form, according to PassYourDrugTest.com. The time it is detectable in a blood test is unknown.