A ketamine prescription is a doctor-supervised use of ketamine, a powerful anesthetic, to treat conditions like severe depression or chronic pain. Ketamine is a Schedule III controlled substance, meaning it requires a prescription from a licensed provider and carries specific restrictions on how it’s dispensed and monitored. While ketamine has been FDA-approved as an anesthetic since 1970, its use for mental health and pain conditions has expanded significantly in recent years, with most of these uses still considered off-label.
What Ketamine Prescriptions Treat
The most common reason people receive a ketamine prescription today is treatment-resistant depression, meaning depression that hasn’t improved after trying at least two standard antidepressants. In 2019, the FDA approved a nasal spray called Spravato (esketamine), a close chemical relative of ketamine, specifically for treatment-resistant depression in adults. Spravato must be used alongside an oral antidepressant, not on its own.
Beyond that single FDA-approved psychiatric use, ketamine is prescribed off-label for a range of conditions. Chronic pain is one of the most studied. Research supports its effectiveness for complex regional pain syndrome (CRPS), neuropathic pain, phantom limb pain, fibromyalgia, and cancer-related pain, particularly when standard treatments have failed. Some providers also prescribe it off-label for severe anxiety, PTSD, and suicidal ideation, though these uses don’t yet have FDA approval.
How Ketamine Is Delivered
Ketamine prescriptions come in several forms, and the method of delivery affects cost, speed of relief, and where you receive treatment.
- Nasal spray (esketamine/Spravato): Sprayed into both nostrils using an atomizer at a certified clinic. The medication absorbs directly into the bloodstream through the nasal lining, bypassing the digestive system for faster effects. This is the only FDA-approved form for depression.
- IV infusion: Ketamine is delivered directly into a vein over roughly 40 minutes to a few hours. IV infusions are widely used at specialized ketamine clinics for both depression and chronic pain, though they remain off-label.
- Intramuscular injection: A shot typically given in a clinic setting, offering a middle ground between the speed of IV delivery and the simplicity of a nasal spray.
- Oral lozenges or tablets: Sometimes prescribed for at-home use between clinic visits, though absorption through the digestive system is less predictable than other methods.
How It Works in the Brain
Traditional antidepressants target serotonin or norepinephrine and can take weeks to show results. Ketamine works through an entirely different system. It blocks a receptor involved in nerve signaling, which triggers a cascade of changes that strengthen connections between brain cells. This process appears to boost the brain’s ability to form new neural pathways, a quality called synaptic plasticity.
One of the most striking features of ketamine is speed. Many patients report mood improvements within hours of their first treatment, compared to the four-to-six-week timeline for conventional antidepressants. Researchers have also found that a byproduct the body creates when it breaks down ketamine may itself contribute to the antidepressant effect, working through a separate pathway that enhances signaling between neurons. This is still an active area of investigation, but it helps explain why the effects can persist days or even weeks after the drug itself has left the body.
Who Can and Cannot Get a Prescription
Ketamine isn’t a first-line treatment. Providers typically consider it after other options have been tried and haven’t worked. For depression, that usually means you’ve gone through at least two adequate trials of standard antidepressants. For chronic pain, it’s generally reserved for cases that haven’t responded to conventional pain management.
Certain health conditions rule out ketamine entirely. Uncontrolled high blood pressure is one of the most important, because ketamine raises blood pressure and heart rate. People with a history of aneurysms, aortic dissection, or recent heart attack are also excluded. Ketamine should be avoided in people with schizophrenia, as it can worsen psychotic symptoms. Anyone who has had a severe allergic reaction to ketamine in the past cannot use it again.
What Happens During Treatment
You won’t pick up a ketamine prescription at your local pharmacy and take it at home the way you would most medications. For the nasal spray (Spravato), federal rules require that you receive every dose at a certified clinic or doctor’s office. After administration, which takes about 10 to 15 minutes depending on the dose, you’re monitored for at least two hours. Staff check your blood pressure around 40 minutes after dosing and watch for sedation, dissociation (a floaty or detached feeling), and changes in breathing throughout the observation period. You can’t drive yourself home afterward.
IV infusions follow a similar pattern. You sit in a supervised clinical setting, receive the infusion, and are observed until your provider determines you’re stable enough to leave. A typical initial course for depression involves multiple sessions over several weeks. Spravato protocols, for example, involve roughly 14 sessions spread across three months, starting with twice-weekly visits that taper to weekly and then every other week.
The experience during treatment varies. Some people feel relaxed or mildly euphoric. Others experience dissociation, which can feel like being slightly outside your own body, or mild visual disturbances. These effects are temporary and typically resolve within the two-hour monitoring window. Nausea is also common, especially with nasal and IV delivery.
Cost and Insurance Coverage
Cost is one of the biggest barriers to ketamine treatment. Of all the delivery methods, only Spravato nasal spray has any insurance coverage, and even that coverage is partial. A full three-month course of Spravato runs about $24,600 before insurance. With commercial insurance covering portions of the medication and clinic visits, out-of-pocket costs drop to roughly $8,500 for 14 sessions, or about $612 per visit.
IV infusions and injections are not covered by commercial insurance, Medicare, or Medicaid because they’re considered off-label. A single IV infusion typically costs $300 to $600, with a standard course of 10 sessions totaling around $3,400 to $6,000 out of pocket. Injections are somewhat cheaper at $275 to $400 per session but are also entirely self-pay.
Some clinics offer financing plans or sliding-scale pricing, but the reality is that most people paying for ketamine treatment, especially IV or injection forms, are covering the full cost themselves.
Who Prescribes Ketamine
Psychiatrists are the most common prescribers for mental health uses. Anesthesiologists and pain management specialists frequently oversee ketamine for chronic pain conditions. In ketamine infusion clinics, psychiatric nurse practitioners and certified nurse anesthetists often collaborate with physicians to deliver and monitor treatment. For Spravato specifically, the prescribing provider and the clinic must both be certified through a federal safety program before they can offer the medication.