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.
Roseola is a very common childhood infection and causes a very high fever followed by a rash. Urinary tract infection symptoms include pain during urination, an intense urge to urinate, and more. Aseptic meningitis, or viral meningitis, can cause fever, headaches, neck pain, nausea, and more. Alcohol intoxication, or drunkenness, is marked by impaired judgment, slurred speech, blurred vision and more.