How long of a withdrawal period should there be for dexedrine (dextroamphetamine) 70mg a day for 5 years?

Depends : Depends how quickly you discontinued the dexedrine (dextroamphetamine). If you tapered it slowly over several days, then you should be fine. If you did a slow taper & still have symptoms, then this should be addressed by your physician. Several possibilities exist to cause continued symptoms from discontinuation of dexedrine (dextroamphetamine). Some of those symptoms may not be withdrawal but adhd symptoms. Discuss with dr.