Can Ketamine Therapy Cause Bladder Damage? What to Know

Does Ketamine Cause Bladder Issues?

Yes, ketamine can cause bladder issues. But "can" and "will" are very different things. With ketamine, the difference comes down to how much is taken, how often, and in what setting.

Bladder damage from ketamine was first described in 2007 in people using it recreationally. Even among people who misuse ketamine, a 2026 clinical review calls it "a rare but potentially serious complication," seen mainly in people who take large amounts often, usually for more than a year (Galloway et al., 2026).¹

Ketamine therapy is a different situation. A clinician sets the dose, sessions are spaced out, and a care team checks in on how you are doing. In most randomized trials of ketamine for depression, people who received ketamine reported urinary symptoms no more often than people who received a placebo or a comparison medicine (Kerr-Gaffney et al., 2025).² In other words, these trials did not show ketamine causing more urinary symptoms than the comparison treatments.

Real-world treatment data points the same way. In Mindbloom's peer-reviewed study of more than 11,000 patients taking sublingual ketamine, painful urination was reported by 0.2% to 0.5% of patients at treatment check-ins (Mathai et al., 2024).³ For Spravato (esketamine), a related medicine given as a nasal spray, nearly 5 years of U.S. post-approval safety reporting included two non-serious cases of cystitis among 58,483 patients (Sanacora et al., 2025).⁴ Lasting bladder damage from supervised mental health treatment is extremely rare.

The FDA label for ketamine lists bladder and kidney complications that "have been reported with long-term ketamine use or abuse" (FDA, KETALAR label).⁵ The label does not give a rate.

Bladder health is the focus here. You can also read about other potential ketamine side effects in a separate guide.

Who Is Most at Risk? Recreational vs. Therapeutic Use

Recreational ketamine use and ketamine therapy are not the same thing, and the bladder research reflects that. Nearly everything known about ketamine bladder damage comes from people using ketamine on their own, mostly from illicit sources, in amounts and patterns that look nothing like treatment.

Frequent Recreational Use and Bladder Risk

In a 2025 survey of 274 people with ketamine use disorder, mostly in the UK, respondents used about 2 grams a day, about five days a week (Harding et al., 2025).⁶ Only 4 of the 274 first got ketamine through a prescription.

Compare that with treatment. A standard IV dose for depression is 0.5 mg per kilogram of body weight, or about 35 milligrams for a 150-pound adult, given a couple of times a week at first (McIntyre et al., 2021).⁷ Even allowing for routes that absorb less ketamine than IV, heavy recreational use means tens of times more ketamine, taken most days of the week.

Bladder risk tracks that exposure. In a UK online survey of 1,285 people who had used ketamine in the past year, 26.6% reported urinary symptoms, and symptoms were linked to both how much and how often they used (Winstock et al., 2012).⁸ That survey is cited in the British Association of Urological Surgeons consensus statement on ketamine bladder. Clinical reviews report urinary symptoms in about a quarter of people who use ketamine regularly, and in as many as 84% of the most frequent users (Galloway et al., 2026).¹

These figures count symptoms people reported, not confirmed bladder damage. They also describe a pattern of use that ketamine therapy does not follow.

What Studies Show in Supervised Ketamine Treatment

A 2025 systematic review of 27 studies of ketamine for mental health conditions, including IV infusion trials, found urinary symptoms in 0% to 24.5% of patients, mostly mild or moderate (Kerr-Gaffney et al., 2025).² The high end of that range came from one trial group, where 13 of 53 patients reported symptoms. In the same trial, 17% of the comparison group, who received a different medicine, also reported symptoms, and the difference was not statistically significant. The review concluded that, based on the limited data available, ketamine treatment "does not appear to be associated with elevated risk of urological symptoms."²

Mindbloom's data adds a large real-world view. In a peer-reviewed study of 11,441 patients taking sublingual ketamine at home with clinician oversight, painful urination was reported by 0.2% to 0.5% of patients at treatment check-ins (Mathai et al., 2024).³ This is a short-term rate, measured during a course of treatment from what patients reported. Individual results may vary.

One published case report describes ketamine-related cystitis in a patient taking prescribed ketamine for depression, which its authors called the first case of its kind (Chang et al., 2024).⁹ She was taking ketamine up to four times a week. Her symptoms resolved within 3 weeks of stopping, and a repeat urine test came back normal.⁹

In medically supervised ketamine treatment, you have a care team to report new symptoms to, so they can be checked early.

Esketamine (Spravato) Trial Data

Esketamine is one half of the ketamine molecule. It is FDA-approved as Spravato, a nasal spray given in certified clinics. Because it is a different medicine from the racemic ketamine used in most ketamine therapy, its data belongs alongside ketamine data, not in place of it.

• Short-term trials: frequent urination in 3% of patients on Spravato (11 of 346) vs. 0.5% on placebo (1 of 222) (Janssen, 2026).¹⁰ The Spravato label notes that urinary symptoms were more common than with placebo (FDA, Spravato label).¹¹
• About one year (SUSTAIN-2): cystitis in 5 of 802 patients (0.6%), and every case resolved while patients stayed on treatment (Wajs et al., 2020).¹²
• Up to 6.5 years (SUSTAIN-3): among 1,148 patients, urinary symptoms such as painful urination (3.0%) were reported, but there was no treatment-related interstitial or ulcerative cystitis (Zaki et al., 2025).¹³
• Nearly 5 years of U.S. real-world use: two non-serious cases of cystitis reported among 58,483 patients across nearly 1.5 million treatment sessions, based on post-approval safety reporting (Sanacora et al., 2025).⁴

For racemic ketamine, the trial evidence above points the same way: in most randomized trials, urinary symptoms were no more common than with comparison treatments.²

What Researchers Still Don't Know

Like most medicines, ketamine has more short-term data than long-term data. In the systematic review, the median follow-up for urinary symptoms was 4 weeks. Only 15% of studies were rated at low risk of bias, and most relied on patients to report symptoms rather than asking about them directly (Kerr-Gaffney et al., 2025).²

Spravato's studies of up to 6.5 years are the main long-term exception.¹³ Thin long-term data is common for medicines. FDA-adopted guidelines for drugs meant for long-term use accept as few as 100 people treated for a full year (FDA, ICH E1).¹⁴ Racemic ketamine for mental health has not gone through that approval process, so researchers continue to study long-term use.

What About Daily Low-Dose Ketamine?

Daily low-dose ketamine is a newer pattern the research has not caught up with. Some providers now prescribe a small ketamine tablet to take every day, with no set end date. That is a different approach from both recreational use and the spaced-out sessions used in most ketamine therapy research. The daily-dosing depression trials we found ran six weeks or less, and none tested the kind of once-daily protocol these providers prescribe to a general population. The authors of one of those trials noted that their six weeks of follow-up could not show the long-term side effects of oral ketamine (Arabzadeh et al., 2018).¹⁵ That means there is no published data yet on the bladder effects of the low-dose, once-daily protocols these providers prescribe, taken for months or years. The best-known daily provider has also not published peer-reviewed data on its own protocol. Learn more about daily low-dose ketamine.

What Is Ketamine Bladder Syndrome?

Ketamine bladder syndrome is an everyday name for irritation and damage to the bladder and urinary tract linked to ketamine use. It has been described mainly in people with heavy, long-term recreational use.

Ketamine Cystitis and Ketamine-Induced Uropathy Explained

Cystitis means inflammation of the bladder. Doctors first described ketamine-related cystitis in 2007, in people using ketamine recreationally, according to a review of ketamine bladder in the Australian Journal of General Practice (Galloway et al., 2026).¹ You may see three names for it:

• Ketamine cystitis: bladder inflammation linked to ketamine use.
• Ketamine bladder syndrome: an everyday name for the same set of bladder problems.
• Ketamine-induced uropathy (KIU): a broader term that also covers damage to the ureters (the tubes from the kidneys to the bladder) or the kidneys.

How Ketamine Affects the Bladder

Your liver breaks ketamine down, and its by-products, called metabolites, leave your body in your urine. Researchers think that with heavy, repeated exposure, these metabolites may irritate the bladder lining and wear down its protective layer, which can trigger inflammation. Over time, ongoing inflammation can thicken and stiffen the bladder wall, so the bladder holds less urine (Galloway et al., 2026).¹ The exact mechanism is still not fully understood.¹

That process takes repeated exposure. In animal studies, the amount of bladder damage rose with the dose of ketamine given (Chang et al., 2024).⁹ In people, it has been seen mainly with frequent, long-term use.

What Symptoms Can Ketamine Bladder Damage Cause?

Ketamine bladder damage usually shows up as symptoms in the lower urinary tract, which can look a lot like a urinary tract infection (UTI). As one clinical review puts it, ketamine bladder is "a rare diagnosis," while urinary symptoms in general are common (Galloway et al., 2026).¹ These symptoms have many causes, so having them does not mean ketamine is the reason.

Urinary Symptoms to Know

A UK government advisory report from the Advisory Council on the Misuse of Drugs (ACMD) lists these urinary symptoms linked to ketamine use (ACMD, 2026):¹⁶

• Frequency: needing to pee more often during the day.
• Urgency: sudden urges to pee that are hard to delay.
• Nocturia: waking up at night to pee.
• Dysuria: burning or pain when you pee.
• Hematuria: blood in your urine.
• Incontinence: leaking urine.
• Bladder pain: pain or pressure low in your belly.

How Symptoms Can Progress Over Time

Among people who use ketamine recreationally, symptoms are most often seen after more than a year of regular use, especially with daily or high-dose use (Galloway et al., 2026).¹ Clinicians describe three stages, based on patients with recreational use. Only the first is considered potentially reversible.¹

Clinical staging of ketamine bladder damage in recreational use (Galloway et al., 2026)

Possible Effects on the Kidneys and Upper Urinary Tract

In advanced cases, which are seen with long-term heavy use, scarring can narrow the ureters. Urine can then back up into the kidneys, causing swelling (hydronephrosis) and reduced kidney function (Galloway et al., 2026).¹ The FDA label for ketamine lists these among the complications reported with long-term use or abuse.⁵

Does Ketamine Bladder Damage Go Away?

It often improves, especially when symptoms are caught early. Most of what is known about recovery comes from people who stopped recreational use, often after damage had built up over years.

What Happens After Stopping Ketamine

Stopping ketamine is the most important part of treatment (ACMD, 2026).¹⁶ Across studies summarized in a 2026 clinical review, symptoms improved in 50% to 91% of people with ketamine bladder who stopped (Galloway et al., 2026).¹ In the UK survey of recreational users, 51% of those who described what happened after stopping said their symptoms improved (Winstock et al., 2012).⁸

In ketamine treatment for depression, the reported cases have resolved. The published case of a patient taking prescribed ketamine for depression cleared within 3 weeks of stopping (Chang et al., 2024).⁹ In Spravato's year-long SUSTAIN-2 study, all 5 cystitis cases resolved while patients continued treatment (Wajs et al., 2020).¹²

When Damage May Be Harder to Reverse

Damage becomes harder to reverse in the later stages, once scarring has set in.¹ A 2026 review in the Canadian Journal of Urology notes that heavier and longer use can cause urinary tract damage that may not be reversible (Tsang et al., 2026).¹⁷ That advanced stage has been described in people with heavy, long-term recreational use, which is why stopping early matters most.

What to Do If You Have Bladder Concerns

If you have bladder concerns, the most useful step is an open conversation with a healthcare provider. That holds whether you used ketamine in the past, use it now, or are considering treatment.

Signs That Need Prompt Medical Care

See a healthcare provider promptly if you notice:

• Blood in your urine: urine that looks pink, red, or brown.
• Strong pain: when you pee or low in your belly.
• Trouble peeing: sudden difficulty starting or passing urine.
• Lasting changes: urinary changes that do not settle.

The FDA label tells prescribers to stop ketamine and refer for urgent urology evaluation if urinary blockage or severe urinary symptoms appear (FDA, KETALAR label).⁵ These symptoms have many causes, including infection, so testing helps find the real one.

How Ketamine Cystitis Is Diagnosed and Treated

Diagnosis starts with an honest history of ketamine use, a urine test to rule out infection, and often a 3-day bladder diary. Some people also need an ultrasound of the kidneys and bladder, or a cystoscopy, which is a camera exam of the bladder done by a urologist (Galloway et al., 2026).¹

Treatment follows a stepwise approach:¹

1. Stop ketamine: the first and most important step.
2. Pain relief and oral medicines: to ease pain and urinary urgency.
3. Treatments placed in the bladder: such as lining-protection medicines or botulinum toxin (Botox) injections.
4. Relieving kidney blockage: stents or drainage tubes when urine backs up.
5. Reconstructive surgery: reserved for end-stage disease.

Ketamine Therapy With a Pre-Existing Bladder Condition

Whether ketamine therapy is right for you with a bladder condition is a clinical decision based on your health history. Share any history of interstitial cystitis, frequent UTIs, overactive bladder, or kidney problems, and any past ketamine use, including recreational use. Your provider weighs this when deciding whether treatment is appropriate. You can also learn more about who may not be a candidate for ketamine therapy.

At Mindbloom, after you choose a program, a licensed provider conducts a medical evaluation to confirm your eligibility before treatment begins.

How Screening and Monitoring Support Bladder Health During Treatment

During treatment, tell your care team about any new urinary symptoms so they can check for other causes, such as infection, and adjust your care if needed. The Spravato label gives clinicians the same direction for esketamine (FDA, Spravato label).¹¹

In Mindbloom's peer-reviewed studies, side effects were collected from patients at treatment check-ins. Serious adverse events of any kind occurred in fewer than 0.1% of patients. The rate was 0.05% among 11,441 patients taking sublingual ketamine in Mindbloom's largest study (Mathai et al., 2024).³ It was 0.08% among 3,041 patients taking subcutaneous ketamine at home (Parks et al., 2026).¹⁸ As of November 2026, Mindbloom has delivered more than 900,000 clinician-supervised sessions. Individual results may vary.

To learn more, read about at-home ketamine safety. When you feel ready, you can take the next step.

Book My Breakthrough

Important Safety Information

IMPORTANT SAFETY INFORMATION Ketamine is not FDA-approved for PTSD, depression, or anxiety. Common side effects include dissociation, increased blood pressure, nausea, dizziness, and cognitive impairment. Ketamine has abuse potential and is not appropriate for patients with uncontrolled hypertension, psychotic disorders, or substance use disorders. Do not drive or operate machinery until the day after treatment. Individual results may vary. Full safety information: www.mindbloom.com/safety-information

OFF-LABEL USE DISCLOSURE Ketamine is FDA-approved only as an anesthetic. Use for mental health conditions represents off-label prescribing by licensed clinicians based on clinical judgment. Schedule III Controlled Substance - DEA regulations apply.