IV vs Sublingual Ketamine: Cost, Results & Side Effects

One of the most common questions patients ask is whether they should pursue IV ketamine at a clinic or sublingual ketamine at home. Both routes deliver the same molecule, but the experience, cost, logistics, and clinical profile differ significantly. Understanding these differences will help you make an informed decision with your provider.

The Pharmacology: Same Drug, Different Delivery

IV (Intravenous) Ketamine

IV ketamine is delivered directly into the bloodstream through a vein. This means 100% of the administered dose reaches systemic circulation -- a concept pharmacologists call bioavailability. The onset is rapid, typically 2 to 5 minutes, and the clinical team can adjust the infusion rate in real time based on your response.

IV ketamine sessions typically last 40 to 60 minutes for the infusion itself, though you should expect to spend 2 to 3 hours at the clinic when you factor in preparation, monitoring, and recovery. A standard treatment course involves six infusions over two to three weeks, followed by maintenance sessions as needed.

Sublingual (Under-the-Tongue) Ketamine

Sublingual ketamine is a tablet or troche that dissolves under the tongue, where the medication absorbs through the oral mucosa into the bloodstream. Bioavailability is lower than IV -- typically 25 to 35% -- which means the dose is adjusted upward to compensate. Onset takes 10 to 20 minutes, and the overall experience tends to be longer and more gradual.

This is the form used for at-home ketamine therapy. Patients receive their medication by mail after a medical evaluation and take it in their own home under remote clinical supervision. For detailed guidance on proper technique, see our article on how to take ketamine.

Comparing the Clinical Experience

Intensity

IV ketamine tends to produce a more intense, concentrated experience. The rapid onset and high bioavailability mean the full effect arrives quickly. Some patients prefer this -- it can feel more decisive and contained within a shorter time frame.

Sublingual ketamine produces a gentler onset with a longer duration. Many patients describe it as a more gradual unfolding, which can feel less overwhelming, particularly during early sessions. For patients who are anxious about the dissociative aspects of ketamine, the sublingual route often provides a more manageable introduction.

Setting

IV treatment requires a clinical setting with medical staff, an IV line, and monitoring equipment. This provides a high level of medical oversight but also means scheduling appointments, traveling to the clinic, and sitting in a medical environment during a vulnerable psychological experience.

Sublingual treatment takes place at home. You are in your own space, with your own comforts -- a familiar couch, your preferred music, your own bathroom. A peer supervisor (a trusted friend or family member) must be present, and your clinical team is available via telehealth. Many patients find this setting more conducive to the introspective work that makes ketamine therapy effective.

Cost

This is where the difference becomes substantial. IV ketamine infusions typically cost $400 to $800 per session, with a standard initial course of six sessions running $2,400 to $4,800 or more. Most insurance plans do not cover IV ketamine for mental health indications.

At Discreet Ketamine, at-home sublingual ketamine treatment starts at $250/month, which includes your medical evaluation, medication, and ongoing clinical support. For a more thorough breakdown, see our comparison of at-home ketamine and infusion clinics.

When IV Might Be the Better Choice

IV ketamine may be more appropriate when:

• Acute crisis intervention is needed -- the rapid onset can provide relief within hours for patients in severe distress
• Precise dose titration is critical -- the clinical team can adjust the infusion rate minute by minute
• The patient has difficulty with oral absorption -- conditions affecting the oral mucosa can reduce sublingual bioavailability
• Initial treatment requires close in-person monitoring -- certain medical histories warrant hands-on clinical oversight

When Sublingual Is the Stronger Option

Sublingual ketamine at home may be preferable when:

• Cost is a significant factor -- at-home treatment is substantially more affordable
• Ongoing maintenance is the goal -- monthly at-home sessions are easier to sustain than repeated clinic visits
• Comfort and privacy matter -- many patients engage more deeply in a familiar environment
• The patient lives far from an infusion clinic -- at-home treatment eliminates travel entirely
• The patient values autonomy -- home-based treatment allows more control over the setting and experience

What I Actually See in My Patients

A few patterns from running an at-home sublingual program that are worth naming, because they shape which route I recommend when a patient asks.

The "I can handle it" overconfidence trap. Patients with prior IV infusion experience sometimes assume they'll tolerate higher sublingual doses because "I already know what ketamine feels like." The pharmacokinetics are different enough that this doesn't always hold. The slower rise of sublingual means the peak arrives when patients aren't paying attention, and a dose they could handle IV can produce more confusion or nausea sublingually. I start these patients at the same dose I'd start anyone else, even when they're frustrated by it, because the 20% of patients for whom this matters really matters.

The "home is more activating than the clinic" surprise. A subset of patients — typically anxious patients, or patients who've been hypervigilant around home dynamics (small kids, difficult partners, demanding jobs) — actually have harder sessions at home than they would in a clinic. The clinical environment gives permission to set everything else aside. Home does not automatically do that. For these patients I'll sometimes recommend a dedicated session space outside the house (a hotel room, a friend's guest room), which solves most of the problem.

Body size and dose scaling. Very-low-weight patients (under 110 lbs) and very-high-weight patients (over 280 lbs) are the two groups where IV precision matters most. Sublingual dosing doesn't scale perfectly with body weight at those extremes. I usually refer these patients out to an IV clinic for at least the induction phase and then consider a sublingual transition once we know their response pattern.

The right switch point. Some patients begin with IV for acute stabilization — usually severe TRD with suicidal ideation, where the 24-hour response of IV is clinically decisive — and transition to sublingual once they're out of crisis and into maintenance. This is a clean handoff when both sides communicate, and I've set up this pathway with a few local clinics I trust.

How to Decide

The right choice depends on your clinical picture, your preferences, and your practical circumstances. I evaluate every Discreet Ketamine patient individually to determine whether at-home sublingual ketamine is appropriate given their medical history, current medications, and treatment goals. Patients who aren't good candidates for at-home treatment get referred out — that's the intake process working as designed.

There is no single correct path. Some patients belong in a clinic for the induction course. Most do fine with sublingual at home. The point of the evaluation is to tell you which group you're in.

If you want to explore whether the at-home sublingual approach is right for you, check your eligibility to schedule a consultation.

Disclaimer: Compounded ketamine for anxiety, depression, PTSD, and chronic pain is not FDA approved.