Common side effects of Concerta include: insomnia, nausea, decreased appetite, and xerostomia. Other side effects include: anxiety, hyperhidrosis, and irritability. See below for a comprehensive list of adverse effects. Ritalin makes me poop We also have been seeing lightning bugs this week, and the magnolias are bloomed, plus also the mimosa trees, a tree I would dearly like in my own yard. I have never understood the joyless people who don't like a flowering tree because it leaves a mess. Good gravy. Rip off the foil lid and enjoy yourself. Flowers are never a mess. This trampoline workout will make you. Concerta (methylphenidate) is a sustained-release form of Ritalin, which is also methylphenidate. It is used when taking 3 or so Ritalin tablets in one day is just too much of a pain in the ass and you want to just have one dose and have it remain steady throughout the day. - Anything that just makes you feel off Honestly, just follow your intuition. Your body and mind will let you know if things are not right for you. That is the best indicator, in most cases. If you have a gut feeling, go with it and tell your doctor about any things that you feel might be a problem or that are making you uncomfortable. Keep in mind, though, that over that first week or so. Concerta is methylphenidate and Vyvanse is an amphetamine (Adderall like). People tend to react (in respect to ADHD) differently to different meds, so if you switch, it may not be as effective. Common Questions and Answers about Concerta in stool concerta I would still double-check especially if you are experiencing pain while passing substances in your stool , if you notice any weird inconsistencies in your stool and especially if you have any blood in your urine or stool. simple as this, anyone ever taken adderall (im not on them, i just got a few from a friend) the next couple of days i had a bloody stool and its been a week since i stopped using adderall and im still having bloody stool. it stopped for a few days but then happened again. Hmm, the character in the story I'm writing experiences these symptoms too. But she had been thinking that maybe it wasn't the ritalin at all, and that maybe it was an efective of the sorbitol that was in all the gum she was chewing. Concerta is a stimulant, and what that means is that it increases your normal body functions (heart rate, breath rate, digestive system, and thought process). You also might try and figure out when it is happening. A lot of kids don't like to poop at school (for a variety of reasons) and try and hold it. When they finally get to the point where they realize it won't work, they don't always make it to the bathroom in time.