This invention is a fault tolerant computer controlled automatic medication dispenser with a unique dispensing system. This dispensing system enables a large number of detachable medication filled dispensing wheels to be vertically stacked and held in a fixed position; and then be automatically dispensed one dispensing wheel. The patient's medication can be dispensed for a few days, weeks, and or many months without a refill. These medication filled dispensing wheels are stored and held in a fixed position within the dispenser.