Ketamine and Blood Pressure: What Happens During an Infusion

Short answer: Ketamine typically raises blood pressure and heart rate for a short time during an infusion, usually peaking partway through and drifting back toward baseline within an hour or two afterward. For most people at the low doses used for depression, the rise is modest and well tolerated. Uncontrolled hypertension and certain heart or vascular conditions are real concerns, which is why continuous monitoring matters.

Why ketamine raises blood pressure

Most sedating medications lower blood pressure. Ketamine is the unusual exception. It stimulates the sympathetic nervous system (the same fight or flight wiring that speeds your pulse when you are startled) and slows the reuptake of norepinephrine, so heart rate and blood pressure tend to climb while the drug is active. In operating rooms, anesthesiologists sometimes use this to support a patient's blood pressure. In mental health care, it becomes something to watch and manage.

How much does it rise?

At the subanesthetic dose most often studied for depression (0.5 mg/kg over about 40 minutes), it varies. A 2018 Emory University report on 684 infusions found average peak increases of only about 3 mmHg systolic and diastolic, around 30 minutes in, described by the authors as small and well tolerated. A 2024 Yale analysis of 138 patients saw larger average peaks, roughly 16 mmHg systolic and 11 mmHg diastolic at about 40 minutes, with severe elevations in under 1% of individual sessions.

The pattern is consistent even when the numbers differ: readings rise during the infusion, peak near its middle or end, and return toward baseline after the infusion stops. Older patients and people with existing hypertension tend to see bigger rises.

When high blood pressure is, and is not, a barrier

Having hypertension does not automatically rule someone out. For many patients whose blood pressure is well controlled, a temporary bump during a monitored infusion is manageable. What matters is the full cardiovascular picture.

The FDA label for ketamine lists it as contraindicated in people for whom a significant rise in blood pressure would be a serious hazard. Clinicians look carefully at uncontrolled or severe hypertension, a history of aneurysm or bleeding in the brain, recent heart attack or stroke, unstable heart rhythm problems, and significant heart failure. Our overview of what disqualifies you from ketamine therapy walks through these screening factors, and every case is decided individually.

How an anesthesiologist-led clinic manages it

Managing blood pressure and heart rate minute by minute is the daily work of anesthesiology. Dr. Geoffery O'Neill, our founder, is a board-certified anesthesiologist who has administered tens of thousands of anesthetics, including years as chief of thoracic and spine anesthesia, where tight blood pressure control is central.

Here, that experience shows up in three ways:

• Screening first. The complimentary telehealth evaluation starts with a safety check that includes cardiovascular history.

• Continuous vital signs. Blood pressure, heart rate, and oxygen levels are monitored throughout each infusion in a private suite.

• Adjustable dosing. IV delivery is the only route that can be slowed or stopped in real time, so the dose can be titrated if readings climb higher than expected.

Our explainer on whether ketamine is safe puts blood pressure alongside the other safety factors worth understanding.

What to share at your evaluation

Bring a complete picture: any high blood pressure diagnosis, home readings if you track them, heart or vascular history, and a full medication and supplement list. Questions about your medications belong with your prescribing physician and our team.

This article is for educational purposes only and is not medical advice. Ketamine is a controlled medication administered under medical supervision. Consult a licensed provider about your individual situation.

The bottom line

Ketamine nudges blood pressure up during an infusion, usually modestly and temporarily. For hypertension that is well controlled, that is often manageable with careful screening and continuous monitoring. Uncontrolled hypertension, aneurysm history, or certain heart conditions change the calculation. If you want an anesthesiologist to look at your own situation, call us at (310) 280-4440.

Frequently asked questions

Does ketamine raise blood pressure? Typically, yes. Its sympathetic stimulation usually raises blood pressure and heart rate modestly during an infusion, with readings returning toward baseline afterward.

Can I get ketamine therapy if I have high blood pressure? Often, if it is well controlled. Uncontrolled or severe hypertension, aneurysm history, and certain heart conditions call for caution or may rule treatment out, and each case is decided individually.

How long does the blood pressure increase last? Studies generally show readings peaking during the infusion and returning toward baseline within roughly one to two hours after it ends, though individual patterns vary.

How is blood pressure monitored during a ketamine infusion? Vital signs are tracked continuously, and the IV dose can be slowed or paused if readings rise more than expected.