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I was taking Concerta 18mg ER, and due to insurance issues was changed to Methylphenidate 20mg ER, manufactured by Mallinckrodt; and Methylphenidate 5mg, manufactured by KVK. I feel like I’m on a placebo! They do nothing for my ADHD, and I have constant diarrhea, stomach cramps and dehydration. I thought I was losing my mind. My insurance company will not cover Concerta OR the Generic version at a reasonable rate. Very sad that the FDA lets this stuff happen.