Probably minimal: My sources indicate no significant interaction with ritalin, (methylphenidate) but with a stronger stimulant such as Adderall lithium might decrease effectiveness. Also both Adderall and Ritalin (methylphenidate) may suppress appetite. Lithium has been reported to suppress appetite, but has also been reported to cause weight gain in some so may depend on your metabolism. Make sure your prescribing doctor knows you are taking both.
Answered 7/1/2014
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