IV vs. Oral vs. Nasal Spray Ketamine: Comparing Your Options

Three Paths, One Goal

If you have decided to explore ketamine therapy, one of the first choices you will face is the route of administration — how the medication is delivered to your body. The three most common options are IV (intravenous) infusion, oral/sublingual tablets or troches, and nasal spray (Spravato). Each has distinct characteristics in terms of effectiveness, experience, cost, and convenience.

Understanding the differences helps you have a more productive conversation with your provider and make a choice that aligns with your clinical needs, lifestyle, and budget.

IV Ketamine Infusion

How It Works

Ketamine is delivered directly into your bloodstream through an intravenous line over approximately 40 minutes. A nurse or medical professional monitors your vital signs throughout the infusion. Sessions take place in a clinical setting.

Bioavailability

Approximately 100 percent. Because the medication goes directly into the bloodstream, there is no loss through absorption or metabolism before it reaches its target. This gives providers precise control over dosing.

The Experience

IV infusion produces the most consistent and often the most intense ketamine experience. The onset is rapid — within minutes — and the peak effects are more pronounced than other routes. Patients commonly report strong dissociative effects, vivid imagery, and significant perceptual shifts. The experience can be deeply meaningful, though it can also feel intense for first-time patients.

Clinical Evidence

IV ketamine infusion has the most extensive research base for treating depression, suicidal ideation, and other psychiatric conditions. It is the form used in the landmark clinical trials that established ketamine as a rapid-acting antidepressant. The evidence for its effectiveness is robust.

Cost

$400 to $800 per session. The initial six-session series typically costs $2,400 to $4,800. Insurance coverage for generic IV ketamine is rare.

Pros

• Highest bioavailability and dose precision
• Strongest clinical evidence base
• Rapid onset of effects
• Direct medical supervision throughout

Cons

• Most expensive per session
• Requires clinic visits two to three times per week during loading phase
• Insurance rarely covers it
• The experience can be more intense than some patients prefer

Oral/Sublingual Ketamine

How It Works

Ketamine tablets, troches (lozenges), or rapid-dissolve tablets are placed under the tongue and allowed to dissolve over 10 to 15 minutes. The medication is absorbed through the mucous membranes in the mouth. This form is commonly used in at-home treatment programs, though some clinics also offer it in-office.

Bioavailability

Approximately 25 to 35 percent sublingually (when absorbed under the tongue). If the medication is swallowed rather than absorbed sublingually, bioavailability drops to approximately 15 to 20 percent. This lower absorption rate means that higher nominal doses may be prescribed to achieve therapeutic effects.

The Experience

The onset is more gradual than IV — typically 10 to 20 minutes for noticeable effects to begin. The peak experience is generally milder and less dissociative than IV infusion. Many patients describe the sublingual experience as more gently relaxing, with softer perceptual changes. Sessions last about 45 minutes to an hour, with effects tapering over the following hour.

Clinical Evidence

There is growing clinical evidence supporting sublingual ketamine for depression and anxiety, though the research base is smaller than for IV infusion. Many of the at-home ketamine programs are generating data on outcomes, and early results are promising.

Cost

$150 to $450 per month through telehealth providers, which typically includes consultations and medication. In-office sublingual sessions may cost $200 to $500 per session.

Pros

• Most affordable option for ongoing treatment
• Can be done at home with appropriate supervision
• More convenient — no clinic visits required (for at-home programs)
• Gentler experience, which some patients prefer
• Flexible scheduling

Cons

• Lower bioavailability means less precise dosing
• Less clinical evidence than IV infusion
• At-home setting means less medical oversight during sessions
• The taste is noticeably bitter

Nasal Spray (Spravato/Esketamine)

How It Works

Spravato is a nasal spray containing esketamine — the S-enantiomer of ketamine. It is self-administered under supervision in a certified healthcare facility. Each session involves several sprays into alternating nostrils, and you must remain at the facility for at least two hours for monitoring.

Bioavailability

Approximately 45 to 50 percent through nasal absorption. This is higher than sublingual but lower than IV.

The Experience

The onset is relatively quick — effects begin within 15 to 20 minutes. The dissociative experience is moderate, typically stronger than sublingual but less intense than IV infusion. The experience varies between patients, but many describe it as a manageable, somewhat dreamlike state.

Clinical Evidence

Spravato is the only FDA-approved form of ketamine for psychiatric use. It was approved for treatment-resistant depression in 2019 and for major depressive disorder with suicidal ideation in 2020. The clinical trial data is strong, though some researchers note that the generic ketamine IV research preceded and informed the development of Spravato.

Cost

$600 to $900 per session without insurance. With insurance, copays range from $0 to $200. The manufacturer's savings program may further reduce costs for eligible patients.

Pros

• FDA-approved for specific psychiatric indications
• Insurance coverage often available
• Good balance of effectiveness and tolerability
• Administered in a supervised clinical setting

Cons

• Must be administered at a certified facility (cannot take home)
• Sessions require a two-hour monitoring period
• Must be used alongside an oral antidepressant per FDA guidelines
• Per-session cost without insurance is high

Side-by-Side Comparison

Which One Is Right for You?

The best route of administration depends on your individual circumstances:

IV infusion may be best if you want the strongest clinical evidence, the most precise dosing, and you are comfortable with a more intense experience. It is the gold standard and often recommended for patients with severe or treatment-resistant depression. Read about the IV infusion experience from a patient perspective.

Sublingual/oral may be best if cost and convenience are important factors, you prefer the comfort of home, and your symptoms are moderate. It is also a good option for ongoing maintenance after an initial IV series. Learn more about the at-home ketamine experience.

Spravato may be best if your insurance covers it and you meet the criteria for treatment-resistant depression. The combination of FDA approval, insurance coverage, and supervised administration makes it a practical choice for many patients.

Discuss these options thoroughly with your provider. They can help you weigh the clinical, logistical, and financial factors to find the approach that gives you the best chance of meaningful improvement.

References

• MedlinePlus: Ketamine Injection — National Library of Medicine drug information on ketamine injection administration methods
• Mayo Clinic: Treatment-Resistant Depression — Mayo Clinic overview of treatment-resistant depression options including esketamine nasal spray
• NIMH: Cracking the Ketamine Code — NIMH research on the different forms of ketamine and their development