What Is the 28-Day Prescription Rule in Massachusetts?

There is no 28-day prescription rule in Massachusetts. The number people are reaching for is 30. Under M.G.L. c.94C § 23, a single filling of a Schedule II or III controlled substance cannot exceed a 30-day supply, and a written Schedule II prescription becomes invalid 30 days after the date your provider wrote it.¹ A separate and stricter rule, § 19D, caps first-time outpatient opioid prescriptions for adults at a 7-day supply.² Those two numbers, 30 and 7, are what the “28-day” shorthand is pointing at.

The Real 30-Day Rule

Section 23 actually contains two 30-day limits that run at the same time, and it helps to see them as separate.

The first is a shelf-life limit. A written or electronic prescription for a Schedule II substance expires 30 days after the date your provider wrote it. If you do not get it to a pharmacy within that window, it is no longer valid and your provider has to write a new one.

The second is a quantity limit per fill. Whenever a Schedule II or III controlled substance is dispensed, that single fill cannot exceed a 30-day supply.¹ It does not matter whether the prescription itself is written for more; the pharmacy can only hand you 30 days’ worth at a time.

This covers a broad set of medications: opioid painkillers like oxycodone and hydrocodone, and stimulants like amphetamine salts and methylphenidate. Refills on Schedule II prescriptions are prohibited under both Massachusetts and federal law, which means each new 30-day fill requires an entirely new prescription from your provider.³ That is why people on long-term Schedule II medication typically see their prescriber about once a month.

The Department of Public Health has authority under § 23 to go tighter still. If the Secretary of Health and Human Services or the Board of Pharmacy determines a specific Schedule II or III substance is being widely abused, the department can reduce the maximum fill to less than 90 days by regulation.¹

The 7-Day Rule for First-Time Opioid Prescriptions

Section 19D, enacted as part of the 2016 STEP Act, is the limit most patients actually run into first. When a provider writes an opioid prescription to an adult for the first time in an outpatient setting, that prescription cannot exceed a 7-day supply.² For minors, the 7-day cap applies to every opioid prescription, not just the first, and the provider has to discuss the risks of opioid use with the parent or guardian.

This is why patients coming out of surgery or showing up to an emergency department with a serious injury often leave with a quantity that feels small. The limit is doing what it was designed to do.

Before writing any Schedule II opioid prescription, Massachusetts also requires the provider to talk directly with the patient about the quantity being prescribed, the patient’s option to fill less than what is written, and the risks associated with the specific opioid.⁴

Exceptions, and Why They Matter

The exceptions to the 7-day rule and the exceptions to the 30-day rule are different. Mixing them up is one of the more common errors.

Getting More Than 7 Days of an Opioid

A provider can prescribe more than a 7-day supply on a first-time opioid prescription if the patient falls into one of these categories:

Acute medical condition where 7 days is clinically insufficient
Chronic pain management requiring ongoing opioid therapy
Cancer-related pain
Palliative or end-of-life care

When the provider invokes one of these exceptions, they must document the triggering condition in the medical record and note that a non-opioid alternative was not appropriate.² The 7-day limit also does not apply at all to medications used to treat substance use disorder, such as buprenorphine prescribed for opioid dependence.

Getting More Than 30 Days Per Fill

Section 23 allows a 90-day supply per fill, instead of the usual 30, for three narrow categories:

Medications prescribed for opioid use disorder treatment, such as buprenorphine
Non-opioid controlled substances like methylphenidate (commonly used for ADHD) and testosterone
Medications delivered through implantable infusion pumps

Those are the only exceptions written into the statute. The 90-day allowance does not extend to opioid painkillers prescribed for chronic pain or palliative care; those still max out at 30 days per fill.¹ So a patient on long-term oxycodone for chronic pain still comes back every 30 days, even though their condition is one of the recognized exceptions to the 7-day first-time rule.

Your Right to Fill Less

Federal rules updated by the Comprehensive Addiction and Recovery Act let you ask the pharmacy to partially fill a Schedule II prescription. Your provider can also request a partial fill on your behalf by writing a specific quantity on the prescription. Either way, the total dispensed across all partial fills cannot exceed what the prescription authorizes, and all portions have to be filled within 30 days of the date the prescription was written.⁵

This pairs directly with the Massachusetts rule that providers tell you about the option to fill less. If you are recovering from a minor procedure and suspect you will not need the full 7 days of opioids, asking the pharmacist for 3 or 4 days’ worth is both legal and encouraged. You can come back for the rest if you need it, as long as you are inside the 30-day window.

What This Means for Refills and Planning

Because Schedule II refills are prohibited, “refill” is the wrong word for how these prescriptions actually work. Each 30-day supply requires a brand new prescription. If you take a Schedule II medication long-term, build in time to see your prescriber before you run out. A few practical points worth knowing:

Every licensed Massachusetts prescriber must check the state’s prescription monitoring database, MassPAT, before writing a Schedule II or III opioid or any benzodiazepine.⁶ That check records every controlled substance you have been dispensed in the state, so filling prescriptions from multiple providers without telling each of them is visible and will raise questions.

Telehealth can keep that monthly appointment manageable. The DEA and HHS have extended pandemic-era flexibilities through December 31, 2026, which allow a DEA-registered provider to prescribe Schedule II through V controlled substances via telehealth without a prior in-person visit, provided other regulatory conditions are met.⁷ The 30-day fill limit and the MassPAT check still apply to telehealth prescriptions exactly as they do to in-person ones. That flexibility is temporary; if the DEA does not extend or replace it, in-person visits could become mandatory again.

If you have Medicare Part D or private insurance, your plan may add its own safety edits at the pharmacy counter that are stricter than state law, particularly for opioids and for patients the plan considers opioid-naïve. Those edits can be overridden with information from your prescriber, but they can also surprise you if you switch plans and the new one draws the line in a different place.

The short version: the number is 30 days per fill for most Schedule II and III medications, 7 days for a first-time opioid, and a new prescription each time for Schedule II. If someone has told you about a “28-day rule,” they were close, and the rule they meant is one of these.

1
Commonwealth of Massachusetts. Mass. General Laws c.94C Section 23 – Written Prescriptions; Requirements and Restrictions
2
General Court of Massachusetts. Massachusetts General Laws Chapter 94C Section 19D – Supply Limitations for Opiate Prescriptions; Exception for Palliative Care
3
eCFR. 21 CFR 1306.12 – Refilling Prescriptions; Issuance of Multiple Prescriptions
4
General Court of Massachusetts. Massachusetts General Laws Chapter 94C Section 18C – Patient Education Required Before Issuance of Opioid Prescription
5
eCFR. 21 CFR 1306.13 – Partial Filling of Prescriptions
6
Cornell Law School. 105 CMR 700.012 – Prescription Monitoring Program
7
Telehealth.HHS.gov. Prescribing Controlled Substances Via Telehealth