
The laws and regulations surrounding prescription refills vary across different US states, and depend on the type of medication being filled. In general, there are five schedules of controlled substances, classified according to their medical value, potential to cause harm, and likelihood of misuse. Schedule I drugs have no medical use, while Schedule V drugs have the lowest potential for harm and misuse. Schedule II drugs, which have the highest potential for harm and misuse, cannot be refilled and require a new prescription each time. Schedule III-V drugs can be refilled up to 5 times in a 6-month period, with a maximum supply of 90 days. However, these rules can vary by state, and pharmacists must ensure that controlled substances are being prescribed for legitimate medical purposes.
| Characteristics | Values |
|---|---|
| Controlled substances that cannot be refilled | Schedule II medications |
| Controlled substances that can be refilled | Schedule III, IV, and V medications |
| Number of times Schedule III, IV, and V medications can be refilled | Up to 5 times in a 6-month period |
| Maximum supply of Schedule III, IV, and V medications | 90 days |
| Number of times Schedule II medications can be refilled | 0 |
| Maximum supply of Schedule II medications | 30 days |
| Prescription refill rules | Vary between insurance plans, states or territories, and medication type |
| Prescription refill restrictions | Often set by state laws or pharmacy policies |
| Prescription refill window | Typically 2 days early for controlled substances |
| Prescription refill time limit | Prescriptions expire after 6 months or 1 year from the date of issue |
| Prescription refill authorization | Doctor's authorization is required for refills after the original prescription has been used |
| Prescription refill emergency laws | Vary by state, with most not allowing emergency refills for controlled substances |
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What You'll Learn

Schedule II medications cannot be refilled
In the United States, there are five controlled substance schedules at the federal level (Schedules CI-V) that are used to classify drugs based on their abuse potential. Schedule I drugs, such as heroin, have a high potential for abuse and can lead to severe psychological and/or physical dependence. As the schedule changes from Schedule II to Schedule V, the abuse potential of the drugs declines.
Schedule II controlled substance prescriptions generally cannot be refilled and expire after 6 months. However, this can vary depending on the state. For example, CII prescriptions are only valid for 30 days after being written in Massachusetts, but they are valid for 6 months in North Carolina. In an emergency situation, a pharmacist may be able to fill a prescription for a Schedule II controlled substance with oral authorization from a doctor, but only for the amount needed for treatment during the emergency period. The prescribing healthcare provider must then send a written prescription within 7 days.
Schedule II prescriptions must be presented to the pharmacy in written form and signed by the prescriber. There are no federal quantity or time limits on Schedule II prescriptions. However, the pharmacist must ensure that the controlled substance is prescribed for a legitimate medical purpose, and the quantity of the medication and the time between signing and filling the prescription may play a role in this decision. State laws may have stricter rules, and some states may allow for partial filling of CII prescriptions.
While prescription refill rules can depend on the state or territory, as well as the type of medication, it is common to see a 2-day window for refilling controlled substances early, often referred to as the "28-day prescription rule."
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Schedule III-V drugs have a maximum of 5 refills
In the United States, medications are grouped into five schedules (I, II, III, IV, or V) based on their medical value, potential to cause harm, and likelihood of misuse. Schedule III-V drugs have a lower potential for harm and misuse compared to Schedule I and II drugs.
Schedule III drugs include products containing not more than 90 milligrams of codeine per dosage unit (e.g., Tylenol with Codeine), combination products containing not more than 50 milligrams of morphine per 100 milliliters or 100 grams, and buprenorphine products used to treat addiction (e.g., Suboxone). Schedule III non-narcotics include benzphetamine (Didrex), phendimetrazine, ketamine, and anabolic steroids such as oxandrolone (Oxandrin) or testosterone (Depo-Testosterone).
Schedule IV drugs include tramadol (Ultram), alprazolam (Xanax), clonazepam (Klonopin), clorazepate (Tranxene), diazepam (Valium), lorazepam (Ativan), midazolam (Versed), temazepam (Restoril), and triazolam (Halcion).
Schedule V drugs include cough preparations containing not more than 200 milligrams of codeine per 100 milliliters or 100 grams (e.g., Robitussin AC and Phenergan with Codeine).
It is important to note that the rules and regulations for controlled substances may vary by state and federal law. For example, the definition of Schedule VI substances varies among different states. Additionally, some states may have more stringent rules than others, and insurance plans can also influence refill rules.
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State laws dictate refill rules
In the United States, refill rules for prescription medications are dictated by a combination of federal law, state law, and insurance company regulations. Federal law divides medications into five groups or schedules based on their medical value, potential for harm, and likelihood of misuse. These schedules are:
- Schedule I: Drugs with no recognized medical use, including heroin, LSD, marijuana, ecstasy, methaqualone, and peyote.
- Schedule II: Drugs with a high potential for harm and misuse, including morphine, codeine, opium, hydrocodone, methadone, oxycodone, and fentanyl.
- Schedule III, IV, and V: Drugs with varying levels of potential for harm and misuse, with Schedule V drugs considered to have the lowest risk.
Each state may have its own variations in CSA schedules, and state laws can impose stricter rules than federal regulations. For example, while federal law does not impose a time limit on when a Schedule II prescription must be filled, California state law prohibits refills on Schedule II substances. Similarly, Massachusetts has a 30-day limit on CII prescriptions, while North Carolina allows up to 6 months.
State laws also dictate the rules for emergency refills, which occur when a pharmacist authorizes a refill because a healthcare provider cannot be reached. Most states do not allow emergency refills for controlled substances, but some may permit refills for Schedule III, IV, or V medications. In an emergency, a pharmacist may be able to fill a prescription for a Schedule II controlled substance with oral authorization from a doctor, but this can vary by state.
In addition to state laws, insurance companies have their own rules about when they will cover the cost of a prescription refill. Insurers may deny coverage for an early refill, and they often set limits on the number of units of a drug that they will cover within a specific time frame.
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Insurance companies have their own refill regulations
Insurance companies, state laws, and federal laws all have guidelines about the timing and frequency of prescription refills for controlled and non-controlled substances. Federal law in the United States divides medications into five groups, or schedules, based on their medical value, potential to cause harm, and likelihood of misuse. Schedule I drugs have no medical use, while Schedule V drugs have the lowest potential for harm and misuse. Schedule II drugs, which have the highest potential for harm and misuse, cannot be refilled, and a new prescription must be written each time.
While the 28-day rule is not a formal regulation, it refers to the number of days one may need to wait between refills of 30-day prescriptions that are considered controlled substances. This waiting period is longer for controlled substances to reduce the chance of misuse. Insurance companies set their own rules about when they cover the cost of a prescription refill. If you refill a medication early, your pharmacy might dispense the drug, but your insurance might not cover the cost.
Insurance company refill regulations can also be based on percentages. In this case, a certain percentage of a prescription must be used before a refill can be obtained. For example, an insurance company may have a 75% refill allowance for all prescriptions, except for controlled substances and stimulants, which may have an 85% allowance. This means that the insurance company won't approve a refill until only 15% of the medication is left.
In some cases, insurance companies place a limit on the number of units of a drug that can be received in a period. If a doctor prescribes more than the limit, the insurance company may not provide coverage for the additional units unless a quantity limit exception is approved.
In an emergency situation, a pharmacist may be able to fill a prescription for a Schedule II controlled substance if given oral authorization by a doctor. The amount dispensed is limited to the amount needed for treatment during the emergency period, and the prescribing healthcare provider must mail or deliver a written prescription within 7 days.
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Pharmacists can use their judgement for emergency refills
In the United States, prescription refill rules vary between insurance plans, states or territories, and the types of medication being filled. Laws and policies regarding controlled substance prescriptions are stricter than for non-controlled substances.
During the COVID-19 pandemic, many health insurance plans changed their refill policies to allow for early refills so that people could access their essential medications. In this case, the pharmacist may need to ask the insurance provider for an override code.
In some cases, pharmacists can use their clinical judgement in accordance with state laws to dispense emergency refills. This emergency prescription refill law, known as Kevin's Law, allows pharmacists to authorize an emergency fill of certain chronic medications if a healthcare provider cannot be reached to authorize a prescription. The pharmacist must use their professional judgement to determine if they have the appropriate knowledge and understanding of the patient's condition and the drug, as well as sufficient information about the patient's health status. The pharmacist must also ensure that the adaptation will maintain or enhance the effectiveness of the drug therapy and will not put the patient at increased risk.
The quantity, day supply, and frequency of medication dispensed in an emergency should be based on the circumstances and the pharmacist's professional judgement, without the need for statutory or regulatory restrictions. Some states allow for dispensing an emergency refill of up to a 30-day supply, which would likely accommodate the full dispensing of a single package of insulin, oral contraceptives, or inhalers. However, for states with a 72-hour supply limit, the law conflicts with the dispensable size of many maintenance medications.
In an emergency situation, a pharmacist may be able to fill a prescription for a Schedule II controlled substance medicine with oral authorization by a doctor. The amount dispensed is limited to the amount needed for treatment during the emergency period, and the prescribing healthcare provider must mail or deliver a written prescription within 7 days.
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Frequently asked questions
Controlled substances are medications that are grouped into five schedules (I, II, III, IV, or V) by the U.S. Drug Enforcement Agency (DEA). These schedules are based on the medical value, potential for harm, and likelihood of misuse of the drugs.
Schedule II drugs cannot be refilled, and a new prescription is required each time. Schedule III-V drugs can be refilled up to 5 times in a 6-month period, with a maximum 90-day supply per refill.
Yes, in an emergency situation, a pharmacist may be able to fill a prescription for a Schedule II controlled substance with oral authorization from a doctor. This is limited to the amount needed during the emergency period, and a written prescription must be provided within 7 days.
Insurance plans often have their own rules regarding prescription refills, which may include requiring a certain amount of time to pass since the last refill. Additionally, insurers may not cover the cost of early refills, resulting in a "refill too soon" denial.
Yes, state laws can vary and may have stricter rules than federal regulations. For example, California prohibits refills for Schedule II substances and limits Schedule III or IV substances to 5 refills or a total of a 120-day supply. It's important to check the specific rules of your state.











































