Ketamine Dosage: What Clinics Give for IV, IM, Nasal and Oral Doses
Last reviewed and updated: July 27, 2026.
Key Takeaways
| IV for depression | The standard is 0.5 mg/kg infused over about 40 minutes, sometimes titrated up to 1.0 mg/kg. |
| Intramuscular | Roughly 0.5 to 1.0 mg/kg given as a single injection. |
| Spravato (nasal) | FDA-approved fixed doses of 56 mg or 84 mg, given in a certified setting with two-hour monitoring. |
| Sublingual and oral | Commonly 100 to 400 mg for at-home telehealth, higher than IV because absorption is lower. |
| Always individualized | Ketamine dosing is weight-based and titrated by a clinician. These ranges are educational, not a prescription. |
Dosage is one of the most important factors to take into account when taking any substance. Only safe ketamine dosages will be administered in therapeutic settings. But in a recreational setting you need to be aware of what a safe ketamine dosage is.
A safe dose of ketamine is an amount that avoids damage to the organs and is non-lethal. This guide will detail what kinds of ketamine dosages are safe and which ones aren’t. Knowing this information will better help protect you and others.
RELATED: Is Ketamine Therapy For Depression Safe?
Therapeutic Ketamine Dosages Done In Clinic
In a clinical setting, ketamine is never delivered in powder form. At a ketamine clinic, you will receive a ketamine solution orally, intranasally or through IM or IV infusions. (The FDA-approved nasal spray is called Spravato.)
Ketamine dosages for conditions like depression are sub-anesthetic doses. This means they do not render patients unconscious and unable to feel pain. Doctors can use anesthetic doses of ketamine for certain operations. Let’s look at the different types of therapeutic ketamine dosages:
| Route of Administration | Typical Dosage |
| Intranasal (Spravato/Esketamine) | FDA-approved fixed doses of 56 mg or 84 mg per treatment session, typically administered twice a week for the first four weeks, then once a week to once every two weeks thereafter. |
| Oral (Lozenges/Troches) – Typically used in ketamine telehealth experiences | The dosage can vary widely depending on the indication and patient response, but often ranges from 100 to 400 mg per administration. This form of administration is typically used for at-home treatments, guided by a healthcare provider. |
| Intravenous (IV) | 0.5 mg/kg over 40 minutes is a common dosage for depression, sometimes titrated up to about 1.0 mg/kg based on response. It may vary based on the individual and the indication for use, and treatments are typically administered over several sessions. |
| Intramuscular (IM) | Given as a single injection, dosing typically ranges from 0.5 to 1.0 mg/kg. |
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Therapeutic Ketamine Doses Are Controlled
These dosages are generally safer due to their medical context. This context helps to increase the safety of the ketamine dosage through the following features:
- Medical supervision and care
- A set and limited number of doses
- A safe and controlled environment (you stay still during the high doses)
- The use of pure ketamine, free from adulterants
- You take ketamine on its own, not in combination with any other substances
- Ketamine preparation and aftercare
- You will undergo a health assessment before treatment. This will ensure you don’t have any underlying conditions that could negatively interact with the ketamine
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Recreational Ketamine Dosages
First, recreational ketamine dosages vary depending on the route of administration. Since sourcing of recreational ketamine can typically not be verified, we do not recommend using ketamine recreationally. But, the range of these dosages is as follows:
- Intravenous (IV) injection: 50 to 100 mg
- Intramuscular (IM) injection: 75 to 125 mg
- Insufflation (intranasal or snorting): 60 to 250 mg
- Oral: 200 to 300 mg
Lower Doses of Recreational Ketamine
In lower dosages, ketamine can lead to effects such as:
- Feelings of calmness, happiness, and relaxation
- A feeling of being intoxicated or drunk
- A dream-like and detached feeling
- Confusion and clumsiness
- Changes in visual and auditory perceptions
RELATED: Are We Getting Closer to Personalized Ketamine Therapies?
Higher Doses of Recreational Ketamine
At the higher end of these ranges, a person can have:
- Intense dissociation
- Out-of-body experiences
- Hallucinations
- Mystical experiences
- Limited awareness of the surrounding environment
Ketamine Dosage Depends On How You Take It
If you take ketamine within the above dosage range, this is unlikely to be toxic to the body. However, this does not necessarily make the dosages, even the lower ones, safe. It all depends on the context.
For example, the route of administration can affect the safety of the experience. Snorting ketamine may damage your nasal passages if you do this on a regular basis. Also, if you use straws or rolled-up bills to snort the drug, these instruments are often not sterile or clean. And you put yourself at risk of different types of infections if you share this paraphernalia.
Injecting yourself with ketamine has its dangers, too, regardless of the dose. Improper administration or sharing needles can lead to physical harm.
Recreational Ketamine is Uncontrolled
Ketamine you buy recreationally could be adulterated with other substances. You may be taking a relatively safe dosage of ketamine, sure. But you could be taking an unsafe dosage of some unknown substance as well.
People take recreational Ketamine in uncontrolled environments also. At higher doses, ketamine can put you at a greater risk of accidents. This is due to the effects of sedation, dissociation, and poor coordination. These accidents can take place at home or out in public and become more likely when you lack supervision.
Taking High Doses Frequently Is Risky
Recreational ketamine use can result in heavy and long-term use. This increases the risk of issues such as organ damage, as well as memory issues. Ketamine dosage safety depends on how often that dosage is taken. Taking high doses frequently is risky.
Finally, many people take ketamine recreationally in combination with other substances. A ketamine dosage can become unsafe when combined with certain drugs and medications. These include alcohol and benzodiazepines, for example. These other drugs can amplify both the physical and psychological effects of ketamine. This can then put you in harm’s way.
Ketamine’s LD50 or Lethal Dose
A lethal dose (LD50) is the dosage of a drug that results in the death of 50 percent of animals in a laboratory condition. It has been estimated that the median lethal dose of ketamine for humans is 600 mg/kg or 42 g for a 70 kg person. As we can see, this ketamine dosage far exceeds the doses we have been referring to. As such, there is no need to worry about having a fatal reaction from ketamine therapy.
There is still a lot we don’t know about the safety of repeated ketamine infusions. This is because ketamine therapy for conditions like depression and PTSD is a relatively new treatment.
Some researchers have raised concerns about repeated ketamine infusions. The concern is that this could lead to addiction or cognitive impairment. When ketamine therapy is closely monitored and limited, these risks decrease. The benefits of ketamine therapy far outweigh any potential downsides for many people.
Where Ketamine Dosing Stands in 2026
IV ketamine for depression still centers on the protocol that launched the field. The standard starting dose is 0.5 mg/kg infused over about 40 minutes. Many clinics titrate upward to roughly 1.0 mg/kg when a patient responds and tolerates it. This dose is weight-based, so it scales with body weight and individual response. Chronic pain protocols work differently. They often use higher doses over longer infusions, sometimes across several hours or multiple days.
The picture outside the IV chair has widened. Spravato, the FDA-approved esketamine nasal spray, uses fixed doses of 56 mg or 84 mg. A patient self-administers it under supervision in a certified setting. A required two-hour monitoring period follows each session. At-home sublingual and oral ketamine prescribed by telehealth has also grown. These programs use higher milligram doses, roughly 100 to 400 mg, because oral and sublingual absorption is lower than IV. Reputable programs screen patients carefully and start low.
The core lesson stays the same. The right dose depends on the person, the route, the condition, and the setting. The numbers here are educational, not a treatment plan. Self-dosing outside medical supervision removes the screening and monitoring that make ketamine safe. Dose is the single biggest driver of both benefit and risk. A qualified clinician should always set and adjust it.
Frequently Asked Questions
- What is the standard IV ketamine dose for depression?
- The standard starting dose is 0.5 mg/kg infused over about 40 minutes, based on the original research protocol. Some clinics titrate the dose upward, commonly up to about 1.0 mg/kg, depending on how a patient responds and tolerates it. Dosing is always weight-based and set by a clinician.
- How much Spravato is given per session?
- Spravato (esketamine) is FDA-approved at fixed doses of 56 mg or 84 mg per session. It is self-administered as a nasal spray under supervision in a certified healthcare setting, followed by a required two-hour monitoring period under its REMS program. It is not taken at home.
- Why are oral and sublingual ketamine doses higher than IV doses?
- Oral and sublingual ketamine have lower bioavailability than intravenous ketamine, meaning less of the drug reaches the bloodstream. To reach a comparable effect, at-home lozenges and troches use higher milligram amounts, commonly in the 100 to 400 mg range, though the exact dose depends on the individual and the prescriber.
- Is there a safe ketamine dose to take on my own?
- No dose is considered safe to take without medical supervision. Ketamine dosing is individualized by weight, route, and condition, and the safeguards that make it safe come from clinical screening and monitoring. Self-dosing removes those safeguards, and dose is the single biggest driver of both benefit and risk.
Lucia
June 4, 2023 at 7:09 pm“It has been estimated that the median lethal dose of ketamine for humans is 600 mg/kg or 4.2 g for a 70 kg person”
But 600*70 = 42,000 mg or 42 g, not 4.2 g!