How Ketamine Therapy Is Administered Safely

You've been researching ketamine therapy and you want to know what it actually involves. Not the theory or the headlines, but the practical details: How does the medication get into your system? What happens during a session? And how do you figure out which method is right for your situation?

Roughly one in three people with depression don't respond adequately to standard antidepressants, and if you're exploring ketamine, you've probably already been through the frustrating cycle of trial and error. Understanding how treatment is delivered, and what keeps it safe, makes it easier to decide whether it's a realistic next step.

The short answer: You can receive ketamine therapy four ways: intravenous (IV) infusion, nasal spray, intramuscular injection, or sublingual tablets. All involve medical screening, monitoring, and an observation period afterward. They differ in setting, cost, and convenience, and the best fit depends on your situation, not just the research rankings.

One important note upfront: the FDA has approved one ketamine-based treatment, Spravato (esketamine nasal spray), specifically for treatment-resistant depression. IV and sublingual ketamine, while supported by clinical evidence, are prescribed off-label for psychiatric conditions. Both are legitimate medical treatments; they just operate under different regulatory frameworks. You'll typically need to have tried at least two antidepressants at proper doses without adequate improvement before a provider recommends ketamine.

The Four Methods

Each route has its own trade-offs in evidence, experience, and logistics.

1. IV Infusion

IV ketamine is the most widely studied method. You receive medication through a line in your arm over 40 to 60 minutes while reclining in a clinical setting. A provider monitors you throughout. It's widely recognized as the gold standard for off-label ketamine use. The trade-offs: every session means a clinic visit, most insurance plans don't cover IV ketamine, and costs typically run significantly more per session at many IV clinics.

2. Spravato Nasal Spray

Spravato is a nasal spray you self-administer while a clinician observes. It's the only ketamine-based treatment with specific FDA approval for depression. The spray itself takes just minutes, but you'll stay at the clinic for at least two hours afterward for monitoring, and you can't drive yourself home. Because of its FDA-approved status, Spravato is more likely to be covered by insurance, though prior authorization is typically required.

3. Intramuscular Injection

Intramuscular (IM) injection delivers ketamine via a shot into muscle tissue in a clinical setting. The research base is much smaller for IM than for IV infusions, with only a handful of IM trials compared with dozens of IV studies. It's also the least commonly offered of the four methods.

4. Sublingual Tablets

Sublingual ketamine involves dissolving tablets under your tongue, typically at home with remote clinical oversight. For people who can't easily get to a clinic because of schedule constraints, mobility issues, or caregiving responsibilities, this removes a real barrier. It's also more affordable than clinic-based methods, and some providers, including Innerwell, offer insurance coverage in select states.

Newer rapid dissolving tablet (RDT) formulations absorb faster than traditional sublingual tablets, which means therapeutic effects can begin sooner during a session. Real-world clinical data and open-label studies show consistent benefit, though the number of controlled trials meeting the most rigorous criteria is still catching up to the IV evidence base.

One distinction worth understanding: the FDA has raised safety concerns about unsupervised at-home models where compounding pharmacies ship ketamine without meaningful clinical oversight. That warning targets a specific problem, not sublingual ketamine itself. Programs that include thorough screening, real-time clinician involvement, and ongoing monitoring operate under a very different safety model.

No research has directly compared these four methods head-to-head.

How Dosing Differs by Method

Each method has a different bioavailability, meaning a different percentage of the ketamine dose actually reaches your bloodstream. IV delivery is 100%; sublingual sits around 24–30%. That doesn't mean sublingual is less effective. It means the prescribed dose is adjusted to compensate, and your provider calibrates it to the route.

What matters for your experience is whether the protocol is designed by a clinician who monitors your response over time.

Comparing the Four Methods

What Safety Protocols Look Like

Safe administration depends on what happens before, during, and after each session, regardless of which method you choose.

Before Treatment Starts

You'll go through a thorough screening and evaluation. This isn't a formality. A qualified provider will conduct a psychiatric assessment to confirm your diagnosis and review your treatment history. They'll verify that you've tried adequate antidepressant trials without sufficient response.

They'll also review your full medical history and current medications to check for drug interactions and contraindications.

Certain conditions are hard stops: uncontrolled high blood pressure, active psychosis, current pregnancy, unstable heart disease, or active substance-use disorder. Others, like a history of past substance use or controlled blood pressure, require case-by-case evaluation rather than automatic disqualification.

If a provider offers ketamine without reviewing your psychiatric history and current medications, that's a red flag.

During Your Session

For clinic-based methods (IV, Spravato, IM), your care team tracks blood pressure, heart rate, oxygen levels, and your mental state throughout treatment. A psychiatrist should be present at the first infusion and immediately available during subsequent ones, with rescue medications on hand.

For at-home sublingual treatment, the safety model is different. There's no on-site emergency team, so the quality of remote monitoring matters. Programs with real-time clinician contact during sessions can guide you through the experience and escalate concerns as they arise.

Regardless of method, ketamine feels like a temporary shift in perception: dissociation is the most common effect. Lights, colors, or sounds may feel more vivid, time can feel slower, and you might see shifting patterns with your eyes closed. These sensations are temporary and normal. Most side effects resolve within a few hours, and by four hours post-treatment, effects have typically cleared completely. Knowing what to expect ahead of time makes the experience much less anxiety-provoking.

After Your Session

Plan to take it easy. For clinic-based methods, you'll stay for at least two hours while your vitals return to normal and dissociative effects fade, and you'll need someone to get you home. For at-home treatment, similar recovery guidance applies, and you shouldn't drive until the next day.

How Safe Is Ketamine Therapy Overall?

If you've seen headlines about ketamine-related harm, you may be wondering how common serious problems actually are. The truth is that ketamine-related problems are very rare when protocols are followed.

A provider survey covering over 6,600 people found that only about 0.7% required discontinuation due to an adverse effect. Phase 3 studies tracking over 800 people for a year found cognitive function remained stable and most side effects resolved the same day. The most common issues during sessions are temporary: elevated blood pressure, nausea, dizziness, and dissociation.

The cases that have made news typically involved unsupervised use, doses far above therapeutic ranges, or combinations with other substances. Under proper medical supervision with appropriate screening, ketamine therapy has a well-documented safety profile across thousands of people and decades of clinical use. That doesn't mean it's risk-free. The screening, monitoring, and post-session observation are what make the safety record possible.

How Innerwell's At-Home Ketamine Therapy Works

Whichever method you're considering, the provider matters as much as the route. Ketamine promotes neuroplasticity, and your brain can form new connections as a result. But that window of flexibility is most valuable when you use it intentionally. The medication opens a door; therapy helps you walk through it. Without therapeutic support, benefits tend to fade faster.

Innerwell's program pairs sublingual ketamine tablets with licensed therapeutic support, all delivered from home. This isn't a medication-only service that ships tablets with minimal oversight. You work with licensed Master's or Doctoral level therapists who guide preparation before sessions and integration afterward.

The process:

1. Evaluation: A comprehensive psychiatric assessment determines whether you're a good candidate, including medical history review, medication check, and mental health screening.
2. Delivery: Sublingual ketamine tablets are prescribed and shipped to your home through a licensed pharmacy, with dosing tailored to your needs.
3. Preparation and integration: Before your first session, a therapist helps you set intentions. After each session, integration therapy helps you process insights and build on the shifts ketamine creates.
4. Ongoing monitoring: Your clinical team tracks your progress and adjusts your plan as needed.

Pricing: Treatment sessions start at $54 per session with insurance, or $83–125 for self-pay, compared to $400–800 per session at many IV clinics.

Program outcomes: 69% reduction in depression symptoms and 60% reduction in anxiety symptoms after 10 weeks. 87% see improvement within four weeks, with a 4.7 out of 5 average rating.

Take our free assessment to see if ketamine therapy might be right for you.

Frequently Asked Questions

How quickly does ketamine therapy start working?

Faster than traditional antidepressants. Benefits can begin within about 40 minutes of a session, though a single session isn't enough for most people. Initial treatment typically involves multiple sessions over two to four weeks, followed by ongoing maintenance.

Can I take ketamine with my current medications?

Most people continue their existing antidepressants during ketamine therapy. Innerwell's clinical team reviews your full medication list during screening to check for interactions. Certain combinations require caution, particularly with monoamine oxidase inhibitors (MAOIs) or high-dose benzodiazepines, which is one reason the evaluation process is so thorough.

Is ketamine therapy safe long-term?

Most people don't need ketamine indefinitely. After the initial treatment course, many transition to maintenance sessions once a month or less. The main concern clinicians monitor over time is urinary symptoms, which can occur with frequent, high-dose use. Regular check-ins with your care team help catch and manage any issues early.

What's the difference between ketamine and Spravato?

Spravato uses esketamine, one component of the ketamine molecule, as an FDA-approved nasal spray administered under direct observation at a certified clinic. IV and sublingual ketamine use the full racemic molecule (a mix of both ketamine forms) and are prescribed off-label. Both are effective for treatment-resistant depression. The main practical differences are insurance coverage, setting, and how the medication is delivered.

Who isn't a good candidate for ketamine therapy?

People with uncontrolled high blood pressure, active psychosis, current pregnancy, unstable heart disease, or active substance-use disorder are generally not candidates. But many conditions that sound like automatic disqualifiers actually aren't. A history of past substance use, blood pressure that's well-managed on medication, or certain psychiatric conditions may require additional evaluation but don't rule you out. Innerwell's screening process is designed to figure out exactly where you stand.