5.2 Partial Filling of Controlled Substances: CARA, Out-of-Stock & Long-Term Care

Partial Filling of Controlled Substances: CARA, Out-of-Stock & Long-Term Care

Partial filling of controlled substances allows patients to receive an immediate portion of their prescribed therapy while maintaining strict regulatory controls over inventory and preventing diversion. For many years, federal law strictly limited Schedule II partial filling to acute pharmacy stock shortages and institutional/hospice settings. However, with the passage of the federal Comprehensive Addiction and Recovery Act (CARA) of 2016 (codified at 21 U.S.C. § 829(f) and 21 CFR § 1306.13) and complementary Mississippi regulations, patients and prescribers have expanded statutory pathways to request partial fills to minimize surplus opioids in the community.

To ensure full compliance on the MPJE and in daily practice, pharmacists must master the four distinct legal frameworks governing Schedule II partial fills, as well as the rules governing Schedules III, IV, and V.

1. Schedule II Partial Fill Frameworks Overview

The legality, operational timeline, and documentation requirements of a Schedule II partial fill depend entirely on the underlying clinical or operational trigger:

+-----------------------------------------------------------------------------+
|                   THE FOUR SCHEDULE II PARTIAL FILL FRAMEWORKS              |
|                                                                             |
|   1. CARA 2016 (Patient or Prescriber Request)                              |
|      - Timeline: Balance filled within 30 DAYS FROM DATE OF ISSUANCE        |
|                                                                             |
|   2. Pharmacy Out-of-Stock (OOS) / Inability to Supply                      |
|      - Timeline: Balance filled within 72 HOURS FROM FIRST DISPENSE         |
|                                                                             |
|   3. Terminally Ill / Long-Term Care Facility (LTCF) Patients               |
|      - Timeline: Balance filled within 60 DAYS FROM DATE OF ISSUANCE        |
|                                                                             |
|   4. Emergency Oral Schedule II Dispensing                                  |
|      - Timeline: Balance filled within 72 HOURS OF ORAL ORDER               |
+-----------------------------------------------------------------------------+

2. CARA 2016 Patient- or Prescriber-Requested Partial Fills

Under Section 705 of the Comprehensive Addiction and Recovery Act of 2016 and DEA regulations (21 CFR § 1306.13(b)), a Schedule II prescription may be partially filled if requested by either the patient (e.g., wanting to reduce out-of-pocket costs or avoid having excess opioids at home) or the prescribing practitioner (e.g., prescribing post-surgical analgesia with instructions to partial fill as needed).

Statutory Conditions for CARA Partial Fills:

1. Permissibility under State Law: CARA partial filling is lawful unless explicitly prohibited by state statute. Mississippi law permits CARA-compliant partial filling.
2. Total Quantity Ceiling: The total quantity dispensed across all partial fills cannot exceed the total quantity originally prescribed.
3. The 30-Day Hard Expiration: The remaining portion of the prescription must be filled within 30 calendar days from the date on which the prescription was written (issued).
4. Dispensing Location: All partial fills must occur at the same pharmacy where the original prescription was presented and partially filled.

[!IMPORTANT] Critical Exam Distinction — Issue Date vs. Fill Date: Under CARA, the 30-day window begins on the date of prescription issuance (written date), NOT on the date the patient presents to the pharmacy or receives the first partial quantity. If a prescription is written on May 1st and the patient receives a partial fill on May 20th, the remaining balance must be filled by May 31st (30 days from May 1st), not June 19th.

Worked timeline examples

A Schedule II prescription is issued May 1 and the patient requests a partial quantity on May 20. The patient-request pathway ends 30 days after issuance, not 30 days after May 20. If instead the pharmacy dispenses part at 2 p.m. Monday solely because stock is short, the out-of-stock balance must be supplied within 72 hours of that dispensing. Document the reason because the clock depends on it.

For a terminally ill patient or LTCF resident, record the qualifying status and each quantity and date; the series ends 60 days after issuance. For an emergency prescription, the remaining portion ends 72 hours after issuance. Across every route, cumulative quantity cannot exceed what was prescribed, and an expired balance cannot be transferred to another Mississippi pharmacy.

A pharmacy record should label the reason for each partial dispensing, quantity supplied, quantity remaining, date and time, and pharmacist identity. Without the reason, an auditor cannot determine whether 30, 72, or 60 days controlled the remaining balance.

Current pathway check

Use the trigger to select the clock: patient or prescriber request—remaining quantity within 30 days after issuance; pharmacy out of stock—remaining quantity within 72 hours after the first partial dispensing; emergency prescription—remaining quantity within 72 hours after issuance; terminally ill or LTCF patient—remaining quantity within 60 days after issuance. Total dispensing may never exceed the prescribed quantity.