Final answer:
A pharmacy registered to dispense controlled substances can distribute up to 5% of its annual dispensation to other registrants without being a registered distributor. If a pharmacy dispenses 100,000 dosage units annually, it can distribute a maximum of 5000 dosage units to other registrants without additional registration.
Step-by-step explanation:
According to the Drug Enforcement Administration (DEA) regulations, a pharmacy registered to dispense controlled substances can distribute a small quantity of those substances to another registrant without being registered as a distributor. This is allowed as long as the total quantity of all controlled substances distributed does not exceed 5% of all controlled substances dispensed and distributed by the pharmacy in a calendar year. Given the annual dispensation of 100,000 dosage units, the maximum amount that can be distributed without obtaining distributor registration would be 5,000 dosage units.
To answer the question directly: Without obtaining registration as a distributor, the pharmacy can distribute to other registrants a maximum of 5000 dosage units. Thus, the correct answer is b. 5000.