Ketamine vs Opioids for Pain Management

Some nights you can't sleep through the pain. Some mornings, walking, working, or taking care of your kids feels harder than it should. You've been dealing with this for a while, and you've probably tried a lot already: physical therapy, gabapentin, injections, and at some point, maybe opioids. They may have helped at first. Then the dose crept up, and the relief got shorter. Now you're caught between pain that still disrupts your day and a medication that doesn't work the way it used to.

About 1 in 4 U.S. adults live with chronic pain, and at least 40% don't get lasting relief from standard treatments. If that sounds familiar, comparing ketamine and opioids is a reasonable place to start.

The bottom line: no head-to-head trial has compared ketamine and opioids for chronic pain, but the evidence we do have suggests they work through very different mechanisms, carry different risks, and may play different roles in a pain plan. Ketamine may reduce pain intensity and improve daily function, though results vary from person to person.

What Are Opioids?

Opioids are probably the most familiar name here. Drugs like oxycodone, hydrocodone, morphine, and fentanyl bind to receptors in the brain and spinal cord to turn down pain signaling. They were the default for moderate-to-severe pain for decades, and most insurance plans still cover at least some of them, though what you pay out of pocket depends on the drug, your coverage, and your pharmacy.

For acute pain after surgery or injury, opioids can be effective. The problem shows up over time. The CDC's 2022 guideline for prescribing opioids found insufficient evidence to confirm long-term benefits for chronic pain, for both pain intensity and daily function.

In some meta-analyses, short-term opioid treatment improved pain by about 0.7 points on a 0–10 scale versus placebo.

What Is Ketamine?

Ketamine is a medication originally developed as an anesthetic in the 1960s. At low doses, it has been studied for chronic pain because of how it interacts with the nervous system's pain-processing pathways. Ketamine is used off-label for chronic pain, typically through IV infusions in clinical settings, because it is not FDA-approved specifically for that use. Clinical guidelines from ASRA, AAPM,and ASA position it as a later-line option for severe nerve pain that hasn't responded to other treatments.

If ketamine itself is new to you, start with this ketamine explainer.

How Ketamine and Opiods Work Differently

The difference between these two approaches starts at the biological level.

Opioids block pain signals by activating the opioid receptor. The catch: a single receptor is tied to both pain relief and the major liabilities of opioid therapy, including tolerance, physical dependence, and withdrawal. Over time, your body adapts, and the same dose produces less relief.

Ketamine works on a different system. In chronic pain, the nervous system can become hypersensitive through a process called central sensitization, where it amplifies pain signals beyond the original injury. The NMDA receptor helps maintain that amplified state. Ketamine blocks that receptor, which may quiet the self-reinforcing pain loop.

That mechanism is part of how ketamine works on chronic pain rather than simply masking the signal.

Opioids can also make pain worse. Opioid-induced hyperalgesia (OIH) is a documented phenomenon where opioid exposure actually increases the nervous system's sensitivity to pain. One study found signs of significant hyperalgesia after just one month of morphine in people with chronic low back pain. Ketamine, by contrast, is not generally associated with OIH in the available literature, and StatPearls notes it may even reverse opioid tolerance.

What the Evidence Shows

Evidence for ketamine for pain is still limited. The 2023 CADTH review notes that its long-term efficacy remains unclear, so any comparison here draws on indirect evidence.

For ketamine, a review that pooled 7 randomized trials (211 people) found ketamine reduced pain by an average of 1.83 points on a 0–10 scale versus placebo, with about 51% of people responding compared to 19% on placebo. Most of these studies are small and measured outcomes only at 1 to 4 weeks, so results vary.

Some of the strongest recent data come from a Cleveland Clinic study of over 1,000 people, where between 20% and 46% saw meaningful improvements in daily functioning, sleep, and pain, though results vary by outcome and person. A 0–10 pain score only captures part of the picture, and the two treatments diverge most on the outcomes that shape daily life.

For opioids, a landmark 12-month trial found no difference in function, and actually higher pain intensity, when people started with opioids versus non-opioid therapy. Ketamine's functional data point the other way: in the Cleveland Clinic study, nearly half of participants reported meaningful improvement in pain-related anxiety, and some saw daily functioning gains lasting up to 6 months.

Chronic pain rarely stays in one lane. The connection between sleep and pain runs both ways, and pain and depression are closely linked too. About 39% of people with chronic pain also live with depression, and not everyone responds to treatment the same way.

Safety and Side Effects

Both treatments carry real risks, and ketamine safety depends heavily on dose and monitoring. The risk profiles, though, look quite different.

Opioid side effects also tend to linger rather than fade: over 33% of people taking opioids have missed or reduced doses because of constipation alone.

Can Ketamine Help Reduce Opioid Reliance?

Whether ketamine can help with opioid reliance is a question many people in chronic pain ask. Any change to an opioid regimen is a decision made with your prescriber, not on your own.

The strongest evidence comes from surgical settings, where ketamine has been shown to reduce post-op opioid use in some studies. In chronic pain specifically, the evidence is more preliminary. A 2024 study that followed 59 people with chronic pain found that 68% achieved a greater than 50% opioid dose reduction after a 5-day ketamine protocol.

That's promising, but the study had no comparison group, and participants also had concurrent opioid use disorder diagnoses, so the results don't transfer cleanly to most chronic pain situations.

The 2025 CNS Drugs review put it plainly: the consistent opioid-sparing effect seen in surgical settings has not yet been replicated with the same consistency in chronic pain.

Cost and Access

Opioid prescriptions are inexpensive and broadly covered by insurance. Ketamine treatment is not. IV ketamine infusions for chronic pain typically cost $300–$2,000 per session, and most private plans don't cover off-label use, so even insured people can face significant out-of-pocket costs.

That said, opioids carry hidden costs: constipation, falls, endocrine problems, emergency visits, and in some cases opioid use disorder itself. The combined economic burden of opioid use disorder and fatal overdoses reached over $1 trillion in a single year.

How to Think About the Choice

Matching Treatment to Your Situation

If you need inexpensive, widely covered short-term pain medication, opioids may still be part of your care.

If you've been living with chronic pain, have watched relief fade over time, or are concerned about tolerance, dependence, or opioid-induced hyperalgesia, it may be worth discussing non-opioid options.

If your pain looks more like nerve pain or centralized pain, where the nervous system amplifies signals beyond the original injury, and standard treatments haven't held up, ketamine may be worth exploring as a later-line option.

If you're currently taking opioids, any change to that plan should happen with your prescriber. Some people are able to reduce their reliance on opioids over time with clinical guidance.

Comparing the Two Care Models

Beyond the medication itself, the two paths differ in how care is delivered.

How Innerwell's At-Home Ketamine Program for Pain Works

Innerwell's at-home ketamine program is built for exactly that situation. Ketamine is prescribed off-label for chronic pain, and the focus here is structured pain care delivered at home, centered on functional improvement: sleep, mobility, daily activities, and the emotional weight that chronic pain carries.

This is a structured 12-week program, not a one-time infusion. It includes clinician-guided dosing, ongoing monitoring, and a care team supporting you over time. That structure is the point: ketamine may ease pain intensity, but lasting gains in how you move, sleep, and function come from the care built around the medication, not a single dose.

The process:

1. Initial assessment: You start with a short online screener that checks preliminary eligibility and whether you're likely on an insurance or self-pay path. From there, you complete a detailed health questionnaire covering your pain history, prior treatments, and current medications, including opioids, followed by a video consult with a licensed clinician specialized in pain management. Your clinician may order and review lab work before finalizing treatment.
2. At-home treatment with oral ketamine: If you're medically approved, treatment is delivered at home through oral ketamine tablets under clinician guidance. The program follows a structured 12-week approach, with dosing and intensity adjusted over time based on your response rather than a one-and-done plan. Medication is shipped to your home, and the program includes an Innerwell Welcome Kit (a $100 value) to support at-home treatment.
3. Adjunct psychiatric support: Because chronic pain often overlaps with depression, anxiety, and sleep disruption, the program includes 4 psychiatric clinician consults across the 12 weeks. This support is built around your pain care, and your team can coordinate with your prescriber if you're currently taking opioids.
4. Ongoing care and tracking: Innerwell's model includes about 4 clinician check-ins per month, plus a patient portal for symptom tracking, dosing logs, scheduling, and messaging with the care team between visits. Your plan is adjusted over time with an emphasis on function.

Insurance coverage mirrors Innerwell's existing ketamine program where available, with self-pay options for people without coverage..

Many patients see improvement in pain intensity, sleep, and daily function within the first month, though results vary by individual. Compared with in-clinic ketamine infusions, the difference is the ongoing care model. It also differs from digital pain apps focused mainly on cognitive behavioral therapy, because care is clinician-guided and prescribed.

See if you're eligible for Innerwell's structured pain management program.

Frequently Asked Questions

Is ketamine a replacement for opioids?

No, and Innerwell doesn't frame it as one. No clinical trial has tested ketamine as a direct, long-term substitute for opioid therapy in chronic pain, and the two work through different mechanisms, so they aren't interchangeable. Some people are able to reduce their opioid reliance over time, but only gradually and with their prescriber.

How long does pain relief from ketamine last?

Most studies measure outcomes between 1 week and 30 days after treatment. Some people in longer protocols have seen effects lasting up to 3 months, and the Cleveland Clinic study reported functional improvements lasting up to 6 months for some participants. Results vary by condition and person.

What if I'm currently taking opioids for pain?

Innerwell's clinical team can coordinate directly with your existing prescriber, so ketamine-based pain care doesn't have to happen separately from the treatment you're already on. If lowering your opioid dose is a goal, that's handled gradually and with your prescriber, never something to attempt on your own.