Federal pharmacy laws and regulations
The federal domain tests the Controlled Substances Act and DEA rules, FDA drug regulation, DSCSA, REMS, and compounding boundaries. Federal law sets a floor that Montana practice must also satisfy.
Controlled substances
DEA registration is required for dispensing controlled substances; schedules come from the CSA. A CII prescription must be written or electronic and cannot be refilled. CIII–V may be refilled up to five times within six months of issuance. An oral CII emergency order may be dispensed only for the emergency period, and the prescriber must provide a written prescription within seven days. Partial fills have schedule-specific rules. Registrants keep records for two years, take a biennial inventory, and use Form 222 or CSOS for Schedule I/II transactions. Corresponding responsibility means the pharmacist must resolve red flags, not merely fill a technically complete order.
FDA and product rules
The FDCA distinguishes legend drugs from OTC drugs and requires approved labeling and marketing. DSCSA imposes transaction information, verification, and serialization duties across the supply chain. REMS can restrict distribution, require documentation, or limit who may prescribe or dispense. Compounding must fit 503A/503B pathways; ordinary pharmacy compounding is not a way to evade FDA approval.
Worked example
A prescriber issues a CIII prescription on January 10 with “refill 6 times.” Federal law caps CIII–V at five refills and six months from issue. The sixth refill is not valid, and a refill dispensed after July 10 is also invalid even if a refill remains. The pharmacist should dispense only within the federal limits, document the calculation, and contact the prescriber for a new prescription if continued therapy is needed.
Traps
Counting total fills instead of refills; forgetting the six-month window; treating state law as authority to exceed federal CII/CIII limits; missing the seven-day written follow-up for emergency CII oral orders; and ignoring DSCSA or REMS conditions.