Sublingual ketamine is held in the mouth, under or against the tongue, so the medication absorbs through the thin tissue lining rather than being swallowed into the stomach. This method delivers a bioavailability of 24 to 30 percent, slightly higher than the 20 to 25 percent you get from simply swallowing it. How you handle the medication in your mouth, how long you hold it, and what you do with the saliva all affect how well it works.
Forms You May Be Prescribed
Sublingual ketamine comes in two main forms. Troches (also called lozenges) are the most common option for at-home treatment. They’re compounded by specialty pharmacies, often with added flavoring to help mask ketamine’s strong bitter taste. Doses typically range from 100 to 300 mg per lozenge, depending on your prescriber’s protocol and your treatment goals.
Rapid dissolve tablets (also called orally disintegrating tablets or ODTs) are a newer alternative. These break down faster in the mouth but are usually unflavored, which means the taste of the medication is more noticeable. Both forms work through the same basic principle: absorption through the mucous membranes of your mouth.
Step by Step: Holding and Dissolving
Place the troche or tablet under your tongue or between your cheek and gum. For rapid dissolve tablets, avoid placing them directly on top of your tongue, as this puts the bitter taste in full contact with your taste buds. Tucking the tablet underneath the tongue lets your mouth start to numb within a few minutes, which reduces the unpleasant flavor.
With a troche, you can gently swish saliva around inside your mouth or lightly chew the lozenge to help it dissolve faster. The goal is to keep the dissolved medication in contact with your oral tissue for as long as you can manage, typically 10 to 15 minutes. During this time, your mouth will produce a lot of saliva mixed with dissolved ketamine. Resist the urge to swallow right away. Any medication you swallow goes through your digestive system and liver first, which breaks down a significant portion before it reaches your bloodstream. This “first-pass metabolism” is exactly what sublingual administration is designed to bypass.
Most providers instruct you to spit out any remaining saliva after the hold period, though some protocols allow swallowing. Your prescriber will give you specific guidance on this. Spitting maximizes the sublingual absorption ratio and tends to reduce nausea.
Preparing for a Session
Skip solid food on the morning of your session. Clear liquids like water are generally fine, and you should take any regular medications with water as directed. Fasting reduces the risk of nausea, which is one of the most common side effects. If nausea has been a problem in previous sessions, your provider can adjust the protocol or prescribe something to take beforehand.
Set up your space before you begin. You want a quiet, low-stimulus environment where you can lie down comfortably for at least an hour. Have a blanket, eye mask, and a spit cup or towel nearby. Many people use headphones with calming music. Make sure someone else is present or reachable, especially during your first few sessions, since ketamine produces dissociative effects that can make it difficult or unsafe to move around.
What the Experience Feels Like
Sublingual ketamine reaches peak blood levels relatively quickly, with initial effects often noticeable within 10 to 20 minutes. You may feel a sense of detachment, floating, or heaviness. Vision can become blurry or dreamlike. Some people describe a feeling of being deeply relaxed while mentally active, while others experience more pronounced dissociation where they feel separated from their body or surroundings.
The most intense effects typically last 30 to 45 minutes, with a gradual tapering over the next hour or two. During this window, your blood pressure and heart rate will rise modestly. In clinical studies, systolic and diastolic blood pressure increased by an average of about 13 mmHg, and heart rate went up by roughly 11 beats per minute. These changes resolved within about 60 minutes and generally stayed below hypertensive levels in otherwise healthy participants. Clinical protocols require a pre-session blood pressure reading below 150/90 mmHg before proceeding.
The numbness in your mouth from the medication itself fades within 30 minutes to an hour. Some people notice a metallic or bitter aftertaste that lingers a bit longer.
Managing Taste and Nausea
Ketamine tastes genuinely bad. Flavored troches help, but the bitterness still comes through for most people. A few strategies make it more tolerable. Sucking on a small piece of candy or having a flavored drink ready for after you spit can clear the taste quickly. Some patients find that breathing through the mouth during the hold period makes the taste more prominent, so breathing through the nose can help.
Nausea is the other big complaint. Fasting helps, but positioning matters too. Lying on your back with your head slightly elevated tends to produce less nausea than sitting upright. Avoid sudden head movements during and after the session. If nausea is persistent across sessions, your prescriber can add an anti-nausea medication to your pre-session routine or adjust your dose downward.
After the Session
Plan to stay in place for at least two hours from the time you take the medication. Even after the peak effects wear off, coordination and judgment remain impaired. Do not drive, operate machinery, or make important decisions for the rest of the day. Most providers recommend having the remainder of your day free of obligations.
Eat a light meal once any nausea has passed. Drink plenty of water. Some people feel tired afterward, while others feel unusually clear or emotionally open. Both responses are normal. If you experience a persistent headache, prolonged nausea, or anything that feels concerning, contact your prescribing provider so they can adjust your protocol for future sessions.
Clinic Sessions vs. At-Home Use
Sublingual ketamine is used in both clinical settings and prescribed for home use, but the level of monitoring differs significantly. In a clinic, staff check your blood pressure before and after administration, and rescue medications for elevated blood pressure or severe anxiety are available on site. Medical supervision means any unexpected reactions are handled immediately.
At-home prescriptions shift more responsibility to you. You need to follow your provider’s instructions precisely, including any blood pressure monitoring they require. Having another adult present during sessions is strongly recommended. At-home protocols generally use lower doses and are reserved for patients who have already tolerated ketamine in a supervised setting. If you have uncontrolled high blood pressure, a history of psychosis, or active substance use concerns, at-home sublingual ketamine is typically not appropriate.