Psychiatrists, primary care physicians, nurse practitioners, and physician assistants can all prescribe mood stabilizers in the United States. The specific rules vary by state, and in a small number of states, specially trained psychologists can prescribe them too. Which provider you see may depend on your insurance, where you live, and how complex your treatment needs are.
Psychiatrists
Psychiatrists are the most straightforward answer to this question. They are medical doctors (MDs or DOs) who completed a residency in psychiatry, giving them deep training in diagnosing and treating conditions like bipolar disorder, where mood stabilizers are most commonly used. They can prescribe any medication without restriction in all 50 states, order the necessary blood work, and adjust dosages based on how you respond over time.
Because mood stabilizers like lithium require regular blood monitoring to stay in a safe range, psychiatrists are often the go-to prescribers for complex cases. They’re trained to manage the interactions between psychiatric medications and to recognize when a treatment plan needs to shift. The downside: wait times for a new psychiatrist appointment can stretch weeks or months in many areas.
Primary Care Physicians
Your family doctor or internist can prescribe mood stabilizers. There’s no legal restriction preventing a primary care provider from writing these prescriptions, and many people get their psychiatric medications this way, especially in areas with few psychiatrists. A primary care physician can order baseline labs, check kidney and thyroid function before starting lithium, and monitor your blood levels over time.
That said, primary care doctors vary widely in their comfort level with mood stabilizers. Some routinely manage bipolar disorder and feel confident adjusting doses. Others prefer to start a patient on medication only after a psychiatrist has made the diagnosis, or they may refer you out entirely for anything beyond straightforward depression or anxiety. If your primary care doctor does prescribe a mood stabilizer, expect the same monitoring schedule you’d get from a psychiatrist: weekly blood draws at first, then every three months during the first year, and every six months after that for most adults.
Nurse Practitioners
Nurse practitioners, particularly psychiatric-mental health nurse practitioners (PMHNPs), can prescribe mood stabilizers in every state. PMHNPs hold graduate-level degrees and complete specialized training in mental health. In many clinical settings, they function similarly to psychiatrists, managing medication regimens, ordering labs, and following patients long-term.
How independently they can practice depends on where you live. The American Association of Nurse Practitioners divides state laws into three categories. In 22 states, nurse practitioners have full practice authority, meaning they prescribe with autonomy comparable to physicians. In 16 states, they work under joint practice agreements with a physician. In the remaining 12 states, they need physician supervision or delegation for controlled substances. Most common mood stabilizers (lithium, valproate) are not controlled substances, so these restrictions typically don’t apply to them directly. However, some medications used alongside mood stabilizers, like certain anti-anxiety drugs, may fall under tighter rules depending on the state.
Physician Assistants
Physician assistants (PAs) can prescribe mood stabilizers in all 50 states, though they work under a supervising or collaborating physician. The level of oversight varies by state. In some states, a PA’s collaborating physician must be physically present or easily reachable. In others, the relationship is more of a formality, with the PA practicing largely independently day to day.
PAs who work in psychiatric practices see mood disorders regularly and are well equipped to manage mood stabilizer prescriptions. PAs in primary care settings can also prescribe these medications, though like primary care doctors, their experience with psychiatric prescribing will vary.
Psychologists in Select States
Psychologists traditionally cannot prescribe medication. They hold doctoral degrees in psychology rather than medical degrees, and their training centers on therapy and psychological testing. However, six states have changed the rules: New Mexico (2002), Louisiana (2004), Illinois (2014), Iowa (2016), Idaho (2017), and Colorado (2023).
In these states, psychologists can earn prescriptive authority by completing extensive additional training. In New Mexico, for example, the requirements include 450 credit-hours of graduate-level coursework in psychopharmacology, a 400-hour supervised practicum with a physician, and passing a national psychopharmacology exam. Even then, a psychologist initially prescribes under conditional status with physician oversight for at least two years before applying for full prescriptive authority. Louisiana requires a post-doctoral master’s degree in psychopharmacology and, for the first three years, every prescription must be made in consultation with the patient’s primary care physician.
In both states, psychologists with prescriptive authority are limited to medications for mental health conditions, which includes mood stabilizers. In practical terms, very few psychologists have completed these requirements so far. New Mexico and Louisiana are the only states where the laws have been in place long enough for more than a handful of psychologists to obtain the credentials.
What Happens Before You Get a Prescription
Regardless of who prescribes your mood stabilizer, certain steps come first. The prescriber needs to establish a diagnosis, which usually involves a detailed interview about your symptoms, mood patterns, family history, and any prior medication trials. Mood stabilizers are most commonly prescribed for bipolar disorder, though they’re sometimes used for other conditions like schizoaffective disorder or severe mood instability.
Before starting lithium specifically, your prescriber will order blood tests to check your kidney function, thyroid function, and baseline electrolytes. Lithium is filtered through the kidneys and can affect thyroid hormones over time, so these values need to be normal before treatment begins. For valproate, another common mood stabilizer, liver function tests are standard because the medication is processed through the liver. These aren’t optional extras. They’re a necessary part of safe prescribing that any qualified provider will order.
Once you’re on a mood stabilizer, the monitoring continues. With lithium, the target blood level for long-term maintenance is generally between 0.4 and 0.8 mmol/L, with levels at or above 1.0 mmol/L raising the risk of toxicity. Your prescriber will check your blood levels weekly at first until they stabilize, then move to every three months during the first year. After that, testing typically shifts to every six months for adults under 65, while older adults stay on the three-month schedule. Kidney and thyroid function should be rechecked at least every six months for the duration of treatment.
Emergency and Hospital Settings
Emergency room physicians can prescribe mood stabilizers during a crisis, but this is usually a short-term bridge rather than the start of long-term treatment. In an acute manic episode, an ER doctor may initiate lithium or valproate alongside short-term medications to manage agitation, with the expectation that an outpatient prescriber will take over within days. If the situation is severe enough to involve risk of harm, hospitalization allows a psychiatrist on the inpatient team to start and adjust mood stabilizers in a monitored setting.
Choosing the Right Prescriber for You
If you’re starting a mood stabilizer for the first time, seeing a psychiatrist or PMHNP is generally the most direct path. These providers diagnose and manage mood disorders daily, and they’re familiar with the nuances of dosing, side effects, and the blood monitoring schedule. If you already have a good relationship with a primary care doctor who’s comfortable managing psychiatric medications, that can work well too, especially for stable patients who’ve been on the same medication for a while.
Access often drives the decision more than preference. In areas with long psychiatric wait times, a primary care physician or PA can start treatment sooner. Many people also use a combination: a psychiatrist or PMHNP manages the medication, while a therapist or psychologist handles the talk therapy side. The key is that whoever prescribes your mood stabilizer is ordering the appropriate blood work and following up regularly, because these medications require more active monitoring than most psychiatric drugs.