Advanced practice registered nurses (APRNs) are the only nurses who can prescribe medications in the United States. Four types of APRNs hold this authority: nurse practitioners (NPs), certified nurse-midwives (CNMs), certified registered nurse anesthetists (CRNAs), and clinical nurse specialists (CNSs). A standard registered nurse (RN) or licensed practical nurse (LPN) cannot write prescriptions, regardless of experience.
The Four Types of Nurses Who Prescribe
All four APRN roles are licensed to evaluate patients, diagnose conditions, order and interpret diagnostic tests, and initiate treatments, including prescribing medications and controlled substances. Each role has a different clinical focus, but all require at minimum a master’s degree in nursing and advanced pharmacology training.
Nurse practitioners are the most widely recognized prescribing nurses. They work across primary care, pediatrics, psychiatry, emergency medicine, and dozens of specialties. NPs handle the broadest range of prescriptions among APRNs, from antibiotics and blood pressure medications to controlled substances like opioids and stimulants. How independently they can prescribe depends heavily on state law.
Certified nurse-midwives hold independent prescriptive authority in all 50 states. Their prescriptions typically center on reproductive health, prenatal care, labor and delivery, and postpartum treatment, but many CNMs also provide general primary care for women across the lifespan.
Certified registered nurse anesthetists primarily select, order, and administer anesthesia drugs during surgical and procedural care. Their prescribing patterns reflect that focus. In a survey of CRNAs in Washington State after they gained prescriptive authority, about 95% prescribed anesthetics, 60% prescribed anti-inflammatory medications, and roughly 53% prescribed narcotic pain relievers. Many CRNAs practice under a “select, order, and administer” model rather than writing traditional outpatient prescriptions.
Clinical nurse specialists work in specialized areas like oncology, cardiac care, or mental health. Their prescriptive authority varies more than the other three roles and is more limited in some states, but they are still classified as APRNs with the legal framework to prescribe where state law permits.
How State Laws Shape Prescribing Power
Where an APRN practices matters as much as what type of APRN they are. U.S. states fall into three categories that determine how much independence a nurse practitioner has when writing prescriptions.
In full practice states, NPs can prescribe medications, including controlled substances, under the authority of their state nursing board alone. No physician involvement is required. This is the model recommended by the National Academy of Medicine and the National Council of State Boards of Nursing.
In reduced practice states, NPs must maintain a formal collaborative agreement with a physician throughout their career to prescribe. The physician doesn’t necessarily review every prescription, but the legal relationship must exist on paper.
In restricted practice states, NPs need ongoing supervision, delegation, or team management by a physician to provide care and write prescriptions. This is the most limiting environment for NP prescribing.
Restrictions on Controlled Substances
Even in states that broadly allow nurse prescribing, controlled substances often come with extra rules. Schedule II drugs, which include powerful opioids, certain stimulants used for ADHD, and some sedatives, face the tightest restrictions.
A handful of states prohibit NPs from prescribing Schedule II controlled substances entirely. Arkansas, Georgia, Oklahoma, and West Virginia fall into this category. In those states, patients who need medications like oxycodone or amphetamine-based stimulants must get those prescriptions from a physician or physician assistant.
Other states allow Schedule II prescribing but cap the supply. Florida limits NPs to a 7-day supply of Schedule II drugs (with an exception for psychiatric medications). Illinois and Pennsylvania cap it at 30 days. Nebraska restricts it to just a 72-hour supply. Michigan allows only a 7-day supply at hospital discharge. Nevada requires NPs to have at least two years or 2,000 hours of clinical experience before they can independently prescribe Schedule II medications, or they must follow a physician-approved protocol.
In Rhode Island, only NPs with a psychiatric or mental health focus can prescribe Schedule II stimulants. Florida similarly restricts psychiatric prescriptions for children under 18 to psychiatric NPs specifically.
What It Takes to Earn Prescriptive Authority
Prescribing isn’t something that comes with a nursing license automatically. APRNs complete significantly more education than registered nurses. The path requires a master’s or doctoral degree in nursing from an accredited program, which typically adds two to four years of graduate-level study beyond a bachelor’s degree in nursing.
Pharmacology training is a core requirement. Wisconsin, as one example, requires 45 contact hours in clinical pharmacology or therapeutics within the five years before applying for prescriber certification. That translates to roughly three semester credits of graduate coursework focused entirely on how drugs work, interact, and should be dosed. Most states have similar pharmacology requirements built into their APRN certification process.
After completing their degree, APRNs must pass a national certification exam in their specialty area. To prescribe controlled substances, they also need a DEA registration number, which is a separate federal requirement on top of state licensure. Not all APRNs choose to obtain DEA registration. In the Washington State CRNA survey, 11% of those with state prescriptive authority had not registered with the DEA, effectively limiting themselves to non-controlled medications.
Beyond Prescriptions: Signature Authority
Prescribing pills is only one piece of the puzzle. NPs increasingly have the legal authority to sign for things that historically required a physician’s signature: disability certifications, handicap parking placards, home health orders, and durable medical equipment authorizations.
Sixteen states and the District of Columbia have “global” signature authority laws, meaning any document that requires a physician signature also accepts an NP signature. These states include Colorado, Hawaii, Massachusetts, Montana, North Carolina, Nevada, New Hampshire, Vermont, Virginia, Washington, and several others. In states without global signature laws, NPs sometimes find they can prescribe a medication but cannot sign the paperwork needed for a wheelchair or a handicap placard, creating gaps in patient care that don’t reflect their clinical training.
RNs and LPNs: What They Can Do
Registered nurses and licensed practical nurses play essential roles in medication management, but prescribing is not one of them. RNs administer medications that have already been prescribed, monitor patients for side effects, adjust IV drip rates within established protocols, and educate patients on how to take their medications correctly. LPNs administer medications under the supervision of an RN or physician. Neither can independently decide what medication a patient should take or write a prescription for it.
If you’re seeing a nurse for care and wondering whether they can prescribe, the simplest distinction is their title. If they introduce themselves as a nurse practitioner, nurse-midwife, nurse anesthetist, or clinical nurse specialist, they hold prescriptive authority. If they’re an RN or LPN, they don’t.