After prolonged use of amphetamine can it cause the need for medication like Ritalin?

Ritalin is just amphetamine with a PG rating. Amphetamine causes your body to release epinephrine and norepinephrine, and your brain has become accustomed to being inundated with these neurotransmitters. It will take a while for you to return to normal. You don't have brain damage from using speed.