Home Mental Health Can I take two doses of 18mg Concerta? Can I take two doses of 18mg Concerta? Memory Trees Aug 17, 2022 0 Comments Tweet on Twitter Share on Facebook Pinterest The recommended starting dose of Concerta for patients not currently taking methylphenidate or stimulants other than methylphenidate is 18 mg once daily for children and adolescents and 18 or 36 mg once daily for adults. Read more… n 18mg addiction treatment can doses drug and alcohol rehab recovery Recovery Partner Network substance abuse take two