Why can't i sleep while taking adderall (dextroamphetamine and racemic amphetamine)? what can i do besides stop taking it?

Common side effect: All stimulants can cause insomnia. Usually it is not severe and lessens with time, but not always. Choices are to see if a lower dose still works but causes less sleep problem, trying a different type of stimulant or a non-stimulant such as atomoxetine or Guanfacine for the adhd, or adding a second medication to combat the insomnia. Some find melatonin to be helpful. Talk to your doctor.