Can you take Claritin and a decongestant?

No you can not. I am an adult taking Ritalin and I took a decongestant with it and I was up for about 2 days. Because under normal circumstances, Ritalin is an "upper" and paired with a decongestant it is like waking a sleeping giant. Do not mix Riatlin with anything unless you have checked it with your doctor. After that episode I am much more careful.