HI, thanks for using healthcare magic
There are potential side effects with any medication. These are problems that can but may not occur with use of the particular tablet.Concerta
is associated with increased chance of headaches
and migraines in some persons.
There is also a risk of myalgia
(pain in muscles) and arthragia (joint pain). It is possible that this is the reason for the discomfort in your knees and elbow.
You can consider speaking or visiting your doctor who can determine whether the symptoms are related to your medication or if there is another cause.
I hope this helps