Dexmethylphenidate, sold under the trade names Focalin among others, is a central nervous system (CNS) stimulant used in the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy. It is in the phenethylamine and piperidine classes of medications. It is the active dextrorotatory enantiomer of methylphenidate.
1 Some allergies cause digestion problems as well. There are also times when you may feel nauseous after every meal. Nausea after meals can also be accompanied with other allergic symptoms, such as, hives or rashes.  Psychological â Sometimes, nausea after eating may also occur due to psychological factors.
Learn about several conditions that may be causing your persistent nausea. 1  slide 1 of 12. Nausea, Nausea Go Away We have all been nauseous at some point of our lives. 2  slide 2 of 12. Stress Stress is one of the most common causes of nausea. 3  slide 3 of 12.