A dosage-dispensing unit serving to store and dispense pulverous or granular dosage material has a housing which includes at least one receptacle space for dosage material and an outlet orifice connected to the receptacle space. The new rows are added in a database transaction that guarantees that the distributed reads and writes of all transactions are processed reliably and that the transactions obey snapshot isolation rules. Next, the number of times the AM envelope crosses a user-definable threshold is determined. The benzoyl peroxide may be pre-micronized to a particle distribution size of about d90 of 0.