Ketamine Infusion vs Oral Ketamine for Depression

You've decided ketamine therapy might be worth trying. Now you're facing a second decision: do you go to a clinic for intravenous (IV) infusions, or take sublingual tablets at home?

The terminology is confusing, the price difference is significant, and every provider's website argues their approach is the best one. You're probably wondering whether IV infusions actually work better, whether the at-home option is safe enough, and whether the cost difference reflects a real gap in quality. These are the right questions.

Both IV and oral/sublingual ketamine can provide meaningful relief for treatment-resistant depression, with response rates around 50–70% depending on the study. IV works faster, often within hours. Sublingual builds over weeks but costs significantly less and lets you treat from home.

The right choice depends on the severity of your symptoms, your budget, and your access to a clinic. Both routes are considered off-label for psychiatric conditions; the FDA has approved ketamine only as an anesthetic.

What Is IV Ketamine Infusion?

During an IV ketamine infusion, you sit in a clinic while an IV line delivers the medication directly into your bloodstream. The infusion itself takes about 40 minutes, with staff monitoring your blood pressure, heart rate, and oxygen levels throughout. You'll stay for about an hour afterward for observation, so each visit runs roughly two hours total.

A typical initial course involves four to eight infusions over two to three weeks, with sessions two to three times per week. Maintenance infusions often happen roughly every two weeks after that. IV infusion has the strongest evidence of any ketamine delivery method for depression, studied in thousands of patients across dozens of randomized controlled trials (RCTs).

What Is Oral/Sublingual Ketamine?

With sublingual ketamine, you hold a dissolvable tablet under your tongue or against your cheek for about seven minutes. The medication absorbs through the tissue in your mouth, and you do this at home, with a prescribing clinician available via telehealth.

Some providers, including Innerwell, use rapid dissolving tablets (RDTs), a newer formulation designed to dissolve faster and absorb more efficiently than standard sublingual tablets. The faster dissolution may improve consistency of absorption from session to session.

Compounding pharmacies prepare the tablets and mail them to you in limited quantities, typically enough for one treatment course at a time. A typical course involves four to six doses spread over four to six weeks. Sublingual absorption is lower than IV absorption, so doses are higher to achieve comparable blood levels.

Sublingual ketamine has a shorter research history, but a large study of 1,247 patients found response and remission rates consistent with clinic-based ketamine treatment.

How They Compare

Efficacy

The evidence quality between the two routes differs more than the outcomes do. IV ketamine's evidence base includes large controlled trials, among them a Mass General Brigham study of 403 patients that found sustained improvement in 55% of participants. Sublingual research is newer and smaller, though growing quickly.

Until recently, no study had directly compared the two routes in the same group of people. A 2024 pilot trial did just that, assigning 61 people with treatment-resistant depression to either oral or IV ketamine over two weeks. Both groups improved by roughly the same amount, with no significant difference in depression scores.

The oral group also had lower dropout rates and fewer side effects. It's a small, open-label study, so it can't settle the question definitively, but it suggests the gap between routes may be narrower than the evidence base alone would imply.

One important nuance: when you take ketamine sublingually, your body converts much of it into a metabolite called norketamine, which appears to have its own antidepressant effects. That secondary activity may partly explain why sublingual ketamine achieves similar outcomes despite lower bioavailability of the parent drug.

Speed

Speed separates the two routes more than anything else. IV ketamine can produce noticeable effects within hours after the first infusion, with peak antidepressant effects around 24 hours.

Oral and sublingual ketamine typically takes two to six weeks to produce full clinically significant improvement, though some people notice early mood shifts within days of their first dose. That's still faster than traditional antidepressants, which often need four to eight weeks. But for someone in acute distress, weeks can feel like a long time.

Cost

IV infusions typically run $400 to $800 per session, with an initial course of six sessions often totaling $2,400 to $4,800. Some people need additional maintenance sessions, which can push total costs much higher. Insurance rarely covers off-label IV ketamine, and most clinics operate on a cash-pay basis.

At-home programs like Innerwell's cost $54–$75 per session with insurance, or $83–$125 for self-pay. Innerwell has insurance partnerships that cover ketamine therapy in multiple states, which is unusual for the field. For people with qualifying coverage, the cost difference between IV and sublingual isn't marginal; it can be what makes treatment affordable.

You may also come across FDA-approved esketamine (Spravato), a nasal spray administered in certified clinic settings. Because it has FDA approval, it may have broader insurance coverage than off-label ketamine, though it's a different medication with its own protocols and costs.

For someone choosing between no treatment and an option they can actually afford, cost may matter more than the evidence gap.

Convenience

The logistics are where these options diverge sharply. IV infusions require someone to drive you home after each session, since you can't operate a vehicle for the rest of the day. If the nearest ketamine clinic is an hour away, you're looking at half a day per visit, two to three times a week, for two to three weeks.

If you're managing depression alongside a job, caregiving responsibilities, or chronic pain that makes travel difficult, that burden can determine whether treatment happens at all.

Sublingual ketamine eliminates most of those barriers. You treat at home on your own schedule, with no travel and no need to arrange a ride. You still need to set aside a couple of hours for the session and rest afterward, but you're already where you need to be.

The Experience

Both routes produce dissociative effects, unusual perceptions, and sometimes unexpected emotional content. The difference is intensity and duration. IV ketamine tends to produce a more intense experience within a shorter window.

Effects typically peak during the 40-minute infusion and fade within an hour or two. Sublingual sessions are generally gentler but last longer; plan on two to three hours in a comfortable space.

Most clinics provide eye masks and calming music during IV sessions, with staff present if you need reassurance. At home, you control the environment, which some people prefer and others find less grounding.

If you're nervous about the experience, the clinical setting may feel safer at first. Many people who start with IV and transition to sublingual find that familiarity with the experience makes the at-home setting comfortable.

Safety

Both routes can cause dissociation, dizziness, nausea, temporary blood pressure elevation, and sometimes anxiety during the experience. These effects are typically mild and brief, and they resolve within a few hours.

The key safety distinction is control. IV infusions can be stopped immediately if something unexpected happens. Once you've absorbed a sublingual tablet, you're committed. IV also allows continuous vital sign monitoring by trained staff, while at-home programs like Innerwell's provide a blood pressure cuff and monitoring tools, and require a peer treatment companion to be present during sessions.

If you have cardiovascular concerns or a history of intense psychiatric reactions, the clinic setting provides a meaningful safety margin. If your depression is moderate with no high-risk factors, at-home treatment can be safe and effective. Understanding your own risk profile is part of figuring out which option fits.

Which Option Makes More Sense for You

Which method works better depends entirely on your situation.

IV infusion may make more sense if your depression is severe or if you need relief as quickly as possible. The rapid onset matters when waiting weeks feels unbearable. It's also a stronger choice if this is your first time trying ketamine, since the controlled clinical setting lets your provider observe how you respond and adjust in real time.

If you have cardiovascular concerns or bipolar disorder, in-person monitoring adds a layer of safety that matters.

Sublingual ketamine may be a better fit if you've already confirmed that ketamine works for you and need a more affordable maintenance option. It also serves people who face genuine barriers to clinic visits, whether that's long distances, limited transportation, or the physical fatigue of depression itself.

If your depression is moderate rather than severe and you're not in crisis, the slower onset is less of a concern.

Some people use both. IV infusions for acute relief or periodic boosters, with sublingual tablets between sessions to sustain the effects. This hybrid approach requires careful coordination with your provider but reflects how many people actually manage long-term treatment.

How Innerwell's At-Home Ketamine Therapy Works

If you're leaning toward at-home treatment, here's what a structured program actually looks like. Innerwell pairs sublingual ketamine with licensed therapeutic support. This isn't ketamine dropped off with minimal supervision. The program includes the medication, the therapy, and the clinical oversight.

The process:

1. Evaluation: A psychiatric provider reviews your history, current symptoms, and medications to determine whether ketamine therapy is appropriate for your situation.
2. Delivery: Sublingual ketamine tablets ship to your home from a licensed compounding pharmacy in controlled quantities.
3. Preparation and integration: Licensed Master's and Doctoral level therapists work with you before and after sessions. Ketamine promotes neuroplasticity, which makes your brain more receptive to change. The medication opens a window; integration therapy helps you use it intentionally. That's where lasting change happens, as you process what comes up during treatment and build new patterns.
4. Ongoing monitoring: Your care team tracks your progress throughout treatment and adjusts dosing and support as needed.

Pricing: Innerwell sessions start at $54 per session with insurance, or $83 for self-pay. Insurance partnerships across the USA (including Washington, California and New York) mean over 80 million people can access licensed psychedelic therapy through their health plan.

Program outcomes: Among Innerwell patients, 69% see significant depression reduction and 60% see significant anxiety reduction after 10 weeks. 87% improve within four weeks of starting treatment, and the program maintains a 4.7 out of 5 patient rating.

Take the free assessment to see if ketamine therapy might work for you.

Frequently Asked Questions

Can I switch from IV infusions to at-home sublingual ketamine?

Yes. Many people start with IV to confirm ketamine works for them, then transition to sublingual for ongoing maintenance. The at-home format is more convenient and affordable for long-term use. Your clinical team can help determine the right sublingual dose and adjust your schedule to maintain the benefits you've gained.

Do I need someone with me during an at-home session?

A peer treatment companion is recommended, especially for your first few sessions. This person doesn't need medical training. Their role is to be a calm, sober presence: available if you need water, a blanket, or reassurance, and able to contact your care team if anything feels off. Many people feel comfortable treating alone after a few sessions, but having someone nearby adds comfort early on.

How long do the effects of each route last?

A single IV infusion typically provides relief for three to seven days. A full course of six infusions extends that, though most people eventually need maintenance sessions. Long-term durability data for sublingual ketamine is still limited in published research. Both routes generally require ongoing treatment to sustain benefits over time.