Ketamine treatment is not permanent. For depression, a single infusion typically provides relief lasting days to a couple of weeks, and most people need ongoing maintenance sessions to sustain the benefits. For chronic pain, the duration varies more widely, but the same principle holds: ketamine resets certain brain processes temporarily, and without follow-up treatments, symptoms generally return.
That said, “not permanent” doesn’t mean “not worth it.” Many people achieve lasting improvement with a structured treatment plan. Understanding how long the effects last, what maintenance looks like, and what factors influence durability can help you set realistic expectations.
How Long Depression Relief Lasts
Ketamine works differently from traditional antidepressants. Rather than slowly building up levels of a brain chemical over weeks, it triggers a rapid burst of new neural connections, a process called neuroplasticity. This is why people often notice improvement within hours rather than months. But those new connections aren’t self-sustaining on their own. Without reinforcement, the brain tends to drift back toward its previous patterns.
After a standard initial course of treatment (usually six infusions over two to three weeks), many people experience significant symptom reduction. Depression scores in clinical trials drop substantially during the first four weeks and continue improving through three months of continued treatment. In the SUSTAIN-2 trial, which followed patients on an esketamine nasal spray plus an oral antidepressant for up to a year, depression scores dropped by an average of 18 to 22 points on standard clinical scales during the treatment period, with both younger and older adults showing comparable improvement.
The catch: when treatment stops, relapse rates climb. This is why most protocols now include a maintenance phase rather than treating ketamine as a one-and-done intervention.
What Maintenance Treatment Looks Like
After the initial series of infusions, most clinicians transition patients to a maintenance schedule. According to Department of Veterans Affairs guidelines, the typical pattern starts at once per week after the initial phase, then gradually stretches to every two or three weeks, with the goal of extending the interval as long as possible. Most patients eventually settle into monthly sessions.
The exact frequency is highly individual. Some people hold their gains for six weeks between sessions, while others notice symptoms creeping back after two. Your provider will adjust the schedule based on how you respond, and the timeline may shift over months as your brain adapts. The VA acknowledges that long-term maintenance with ketamine “may be a reality” for some patients, and there’s no set endpoint for when treatment should stop.
This open-ended nature is one of the biggest practical considerations. Ketamine maintenance is a commitment of time and money, particularly since many insurance plans still don’t cover IV ketamine infusions (though the nasal spray esketamine has broader insurance coverage).
Results for Chronic Pain
Ketamine’s effects on chronic pain follow a different, and less predictable, pattern than its effects on depression. According to Stanford’s pain medicine program, patients generally fall into three groups. Some feel better only during the infusion itself, with pain returning shortly after. Others get relief lasting days to weeks. And roughly 30 to 50 percent of patients experience improvement that lasts for months at a time.
The treatment approach for pain also differs. Short 30- to 40-minute sessions commonly used for depression may not be sufficient for chronic pain conditions. Stanford’s protocol, for example, involves a five-day continuous hospital infusion for conditions like complex regional pain syndrome (CRPS) and neuropathic pain. The theory is that ketamine can “reset” the brain’s pain-processing networks, and longer exposure may produce more durable changes. Patients with conditions where traditional treatments have failed, particularly CRPS and neuropathic pain, tend to be the best candidates for this approach.
Does Adding Therapy Make It Last Longer?
A common assumption is that combining ketamine with psychotherapy would help “lock in” the benefits, since ketamine opens a window of heightened neuroplasticity that therapy could theoretically exploit. The evidence so far doesn’t support this. A recent study comparing ketamine alone to ketamine plus psychotherapy found no significant difference in symptom improvement at 30 days or even at 180 days. Patients who received therapy alongside ketamine did about the same as those who received ketamine by itself.
This doesn’t mean therapy is useless for people receiving ketamine. It means that during the acute treatment phase, adding structured psychotherapy sessions doesn’t appear to extend the duration of ketamine’s antidepressant effects. Therapy may still help with broader coping strategies, behavioral changes, and long-term resilience through other mechanisms.
Safety of Long-Term Use
Because many patients end up on maintenance ketamine for months or years, long-term safety matters. The good news: at the low doses used in clinical settings, the risk profile is considerably better than what’s seen with recreational use. A 2026 review by the UK’s Advisory Council on the Misuse of Drugs drew a clear line between therapeutic and illicit use, noting that “chronic therapeutic prescription of ketamine using recommended doses is unlikely to produce significant addiction because of the relatively low doses involved.”
The risks that do exist are largely dose-dependent. At higher doses and more frequent use (the pattern seen in recreational users), ketamine can cause serious problems:
- Bladder damage: A condition called ketamine-induced uropathy can cause urinary frequency, urgency, incontinence, bladder pain, and blood in the urine. This is one of the most well-documented long-term harms.
- Liver injury: Regular use can cause abnormal liver function, bile duct widening, and in prolonged cases, irreversible liver scarring. About 10 percent of regular recreational users show these changes.
- Abdominal pain: More than a quarter of regular users experience chronic stomach pain, sometimes with vomiting, colloquially known as “K-cramps.”
- Cognitive effects: Chronic high-dose use can impair memory and other cognitive functions, though this appears minimal at therapeutic doses.
The important qualifier is that these complications are associated with the high doses and daily use patterns of recreational users, not the controlled, lower-dose protocols used in clinics. Still, the ACMD recommended establishing a registry to track all patients receiving regular ketamine or esketamine prescriptions, precisely because long-term safety data at therapeutic doses remains limited. If you’re on a maintenance protocol, periodic monitoring of liver and bladder function is a reasonable precaution.
What Determines How Long Your Results Last
Several factors influence whether ketamine’s effects fade quickly or hold for extended periods. The severity and duration of your depression or pain condition plays a role, as does whether you’re taking a concurrent oral antidepressant (most clinical trials used ketamine alongside one, not as a standalone). Your individual brain chemistry matters too, and there’s currently no reliable way to predict who will be a long-term responder before starting treatment.
Lifestyle factors like sleep quality, exercise, and stress levels also affect how long benefits persist, though these haven’t been studied rigorously in the context of ketamine specifically. What is clear is that ketamine creates a window of opportunity for change in the brain. For some people, that window leads to sustained improvement with decreasing need for boosters. For others, regular maintenance remains necessary to keep symptoms at bay. Neither outcome is a failure; they’re just different treatment trajectories for a tool that, while powerful, is not a permanent fix.