That happened to me also when I first started on Adderal years ago. I slowly gave up coffee. * years later I usually have a good size cup of coffee every day. I would imagine my body is pretty used to the amphetamines by now but Id wait like 6 months to build up your tolerance. If coffee is something you don’t want to give up.
You might get a little cranky and get a slight headache from the withdrawal. Just a heads up.