IV vs. IM vs. Oral Ketamine | What's the Difference?

If you've been researching ketamine, you've probably noticed that there are a lot of different ways it can be given — IV infusions, intramuscular injections, pills you dissolve under your tongue, nasal sprays. It can be hard to know what actually makes a difference and what's just marketing.

So let me break it down for you honestly. At Seagrass, we offer IV and IM ketamine — both administered in-office with continuous monitoring and psychiatric oversight. We don't offer at-home oral ketamine, and this page will explain exactly why. No judgment if you've looked into it — it's worth understanding what you're comparing.

The core difference — bioavailability

The most important thing to understand about ketamine is bioavailability — the percentage of the medication that actually reaches your bloodstream and brain where it can do its work. Here's where the three routes differ significantly:

— IV ketamine: ~100% bioavailability. The medication goes directly into your bloodstream — nothing is lost, and dosing is precise.
— IM ketamine: ~93% bioavailability (based on older adult studies; some newer research suggests it may be more variable). Still very high, and clinically effective — but with slightly less precision than IV.
— Oral ketamine: only 8–29% bioavailability. The majority is broken down by your liver before it ever reaches your brain, which means you need a much higher dose to get a similar effect — and the results are far less predictable.

In plain terms: IV gives us the most control, IM is a strong and effective option, and oral is the most unpredictable of the three. That unpredictability matters a lot when we're working with a powerful medication like ketamine.

Man, sleep and iv drip with headphones for healthcare, iron infusion or immune booster in

IV Ketamine - The Gold Standard

IV ketamine is the most studied and most precise route of administration. Because it goes directly into your bloodstream, we know exactly what your body is receiving — and we can adjust in real time if needed. The onset is fast, the experience is consistent, and the clinical evidence behind IV ketamine for depression, PTSD, anxiety, and suicidal ideation is the strongest of any route.

At Seagrass, every IV session takes place in a calm, private room with continuous monitoring of your blood pressure, heart rate, and oxygen levels. I stay with you throughout — you're never left alone. The infusion itself takes about 40 minutes, followed by a short recovery period before you head home with your driver.

If you want the most controlled, evidence-backed ketamine experience available, IV is it.

IM ketamine — effective, no IV line

IM ketamine is a genuinely good option — not a lesser version of IV. The bioavailability is high, the therapeutic effects are comparable, and for patients who are needle-averse when it comes to IV lines, or who simply prefer a straightforward injection, IM can be the right fit.

That said, I want to be honest with you: IM is slightly less precise than IV. Because absorption can vary a little more between individuals and sessions, we actually monitor IM patients just as closely — sometimes more so — than IV patients. The onset is a bit slower (typically 10–20 minutes, depending on your metabolism), and the experience can feel somewhat different from IV.

IM ketamine is available to any patient at Seagrass. We'll talk through which route makes the most sense for you during your consultation — and if you're not sure, we can start there and adjust.

Oral ketamine — why we don't offer it

Oral ketamine has gotten a lot of attention lately, largely because of companies that mail ketamine lozenges directly to patients for home use. I understand the appeal — it's convenient, it's lower cost, and it feels less intimidating than coming into a clinic.

But here's what concerns me: with only 8–29% bioavailability and a lot of variability in how people absorb it, the same dose can feel very different from one person to the next — and from one day to the next in the same person. Without someone monitoring you, there's no safety net if something unexpected happens.

Ketamine works best when it's part of a supported, integrated plan — not something you're managing alone at home. The integration sessions we include at Seagrass are part of what makes the difference between a temporary lift and lasting change. That's why we don't offer it at Seagrass.

IV Ketamine Recommended

In-office, fully monitored

$350 / session

6-session bundle: $1,785 (save $315)

Includes:
— Private treatment room
— Continuous vitals monitoring
— Psychiatric provider present throughout
— 30-min integration session within 24–72 hrs
— Superbill provided for insurance submission

IM Ketamine

In-office, fully monitored

$300 / session

6-session bundle: $1,530 (save $270)

25% discount for active and former military (ID or DD-214) and first responders (Police, Fire, EMS) with badge. Bundle pricing and military/first responder discount cannot be combined. Financing available through Advance Care — call 800-432-9470 or visit advancecarecard.com.

Not sure which is right for you?

That's exactly what the consultation is for. We'll go through your history, your goals, and your preferences — and figure out together what makes the most sense. There's no pressure and no obligation. If ketamine isn't the right fit, we'll talk about what is.

Schedule a free consultation →

Read our Ketamine FAQ →

IV vs. IM vs. Oral Ketamine | What's the Difference?

The core difference — bioavailability

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IV Ketamine Recommended

IM Ketamine

Not sure which is right for you?