If you’re considering IV ketamine therapy for depression, anxiety, or PTSD, two questions come up almost every time before someone books: How many infusions will I actually need? And how long will the relief last once I feel better?
They’re fair questions. Ketamine isn’t like a daily antidepressant you take indefinitely, and it isn’t a single magic shot either. It works on its own timeline. After overseeing thousands of infusions at AlphaOmega Wellness, here’s the honest, evidence-based answer — including why the number is different for different people, and what you can do to make your results last.
The short answer
Most people start with an initial series of about six infusions over two to three weeks. From there, many transition to occasional booster (maintenance) infusions — often starting around once every four to eight weeks and spacing out further over time as the brain’s changes take hold. How long relief lasts varies widely: anywhere from a couple of weeks to several months per phase, depending on the person and what they do between treatments.
That’s the summary. The details are where it actually gets useful, so let’s walk through each phase.
Phase 1: The initial series
The first phase of treatment is the most important one. Research on IV ketamine for treatment-resistant depression consistently uses an initial series of roughly six infusions delivered over two to three weeks, often two to three sessions per week.
Why a cluster of treatments instead of just one? Because a single infusion can lift mood for a few days, but the effect tends to fade quickly on its own. The evidence-based research would say, that one infusion can take someone from suicidal to not suicidal — pretty awesome! However, repeated, closely spaced infusions do something different: they help the brain rebuild and strengthen connections, what researchers call neuroplasticity. Stacking the sessions close together is what turns a short-lived lift into a more durable shift.
When will I start to feel something?
Many people notice a shift after the first or second infusion — though it’s often not what they expect. Patients usually imagine they’ll wake up feeling happy. More often, the earliest change is an absence: the relentless inner critic goes quiet, sleep improves, or the morning dread that used to greet them simply isn’t as loud. We’ve written more about what changes first in ketamine therapy, because knowing what to look for helps you recognize progress instead of waiting for the wrong signal.
That said, the most consistent and lasting improvement usually shows up after the full series is complete, not partway through. If you don’t feel transformed after infusion two, that’s normal. The series is designed to work as a whole.
How long does relief last after the initial series?
After a full initial series, at our office, people experience meaningful relief for months to we haven’t seen them back. Not because they don’t love us, but because they don’t need us. We always say your needing a booster or a follow-up infusions is between you, your brain, and the chronic stress you are still living in. That is why we have learned the importance of pairing this therapy with good brain health integration. The research data would agree, the relief window is genuinely wide — some people “relapse” within a couple of weeks without follow-up, while others hold their gains for months or longer. Ketamine opens a window; what you do with that window largely determines how long the benefits last. Our goal is always that you need us less, not more, so we encourage good brain health activities and integration along with your IV ketamine therapy journey via our educational integration tools.
Phase 2: Booster (maintenance) infusions
Depression, anxiety, and PTSD are often chronic, relapsing conditions. So for many people, ketamine therapy isn’t a one-and-done event. It’s an initial series followed by periodic booster infusions to maintain the gains. That doesn’t = failure, it just means you need continued brain health support.
There’s no universal schedule, but a common pattern may look like this:
- Early maintenance: a single booster quarterly to semi annually, timed to head off symptoms before they fully return.
- Extending out: as stability builds, many people stretch those boosters out to as needed or with a triggering event.
- Long-term: some people may stop needing them for a stretch as the brain’s neuroplastic changes become more established and that’s great!
The goal is always to use the fewest infusions that keep you well. Boosters are guided by how you’re actually doing, not by a rigid calendar. Many patients learn to recognize their own early warning signs and reach out before a relapse takes hold.
What makes results last longer?
This is the part most people underestimate. The infusion is the catalyst, not the cure. What you do around your treatments has an enormous effect on how few infusions you’ll ultimately need and how long each round lasts.
- Therapy and integration. Ketamine creates a uniquely open, flexible mental state. Pairing it with therapy or intentional integration work can dramatically extend results — in some studies, combining ketamine with structured therapy lengthened the time to relapse several-fold compared with infusions alone.
- Setting intentions. Coming into each session with a clear purpose changes the experience. Here’s why setting intentions before your infusion matters more than most people expect.
- Sleep, movement, nutrition, and connection. The neuroplastic window ketamine opens is when new, healthier patterns take root most easily. The basics aren’t glamorous, but they’re when the real rewiring happens.
- Severity and history. How long you’ve struggled, other health conditions, and your overall starting point all influence the number of infusions and the durability of relief.
Our approach at AlphaOmega Wellness
At AlphaOmega Wellness in Indiana, we start with a real conversation and a careful evaluation. Most patients begin with an initial series, and we decide together whether and when boosters make sense based on how you’re doing. Because Dr. Dee Bonney comes from an emergency-medicine background every infusion is medically supervised by ACLS trained and psychedelic certified support staff and the protocol is built around your safety and your response.
What shouldn’t vary is the care behind the plan: thorough screening, medical monitoring during every infusion, and a provider who adjusts your protocol based on how you respond. If you want to understand the safety side of all this, we cover it in depth in Is Ketamine Therapy Safe?
If you’re wondering what the experience itself is like before you commit to a series, start with What Does IV Ketamine Feel Like?
Frequently Asked Questions
How many ketamine infusions do you need for depression?
Most treatment plans begin with an initial series of about six infusions over two to three weeks. After the series, many transition to occasional booster infusions to maintain results. The exact number depends on your diagnosis, history, and how you respond.
How long does relief from a ketamine series last?
It varies widely. Pairing treatment with therapy, integration, and healthy routines tends to extend how long the benefits last.
How soon will I feel better?
Many people notice a shift after the first or second infusion, though the most consistent results usually appear after completing the full series. The earliest sign is often subtle, quieter negative thoughts or better sleep, rather than a dramatic mood lift.
Will I need ketamine infusions forever?
Not necessarily. Because depression and PTSD are often chronic, many people benefit from periodic boosters but the goal is always the fewest infusions needed to stay well. Some patients space boosters out to every few months or take extended breaks, especially when they pair treatment with therapy and lifestyle support.
How often are booster infusions?
A common pattern starts quarterly as stability builds. Boosters are guided by how you’re doing, not a rigid schedule.
What if the first series doesn’t work?
Most people who are appropriate candidates respond, but not everyone does, and that’s something we monitor closely throughout your series. If you’re not responding as expected, your provider can adjust the protocol or discuss other options. A thorough evaluation up front helps set realistic expectations.
Ready to talk it through?
The best way to find out how many infusions you might need is a conversation with a provider who will actually evaluate your situation. If you’re in Indiana and exploring IV ketamine therapy, reach out to AlphaOmega Wellness to schedule a consultation — we’ll give you a straight, personalized answer.
This article is for educational purposes only and is not medical advice. Ketamine therapy isn’t right for everyone. Always consult a qualified medical provider about your individual situation before starting or changing any treatment.