Ketamine for Chronic Pain: How the At-Home Model Works

Chronic pain changes your brain. That isn't a metaphor. When pain persists for months or years, the nervous system undergoes structural and chemical changes that amplify pain signals, blunt the body's natural pain-control mechanisms, and (the part that surprises patients most) overlap substantially with the brain circuitry of depression and anxiety.

Many of my patients with chronic pain have spent years cycling through pain medications, antidepressants, physical therapy, and specialist visits without finding meaningful relief. Ketamine offers a fundamentally different approach because it targets the specific neural mechanism (glutamate dysregulation at NMDA receptors) that sustains both chronic pain and depression simultaneously. Here's how that works, which conditions tend to respond, and where ketamine isn't the right tool.

The pain-depression overlap is biological, not coincidental

If you live with chronic pain, you already know that it affects your mood, your sleep, your relationships, and your capacity to function. What's less commonly known is that pain and depression aren't just commonly co-occurring; they share brain circuitry at the deepest level.

Both chronic pain and depression involve dysregulation of the glutamate system, the brain's primary excitatory neurotransmitter network. In chronic pain states, glutamate signaling becomes overactive, driving a phenomenon called central sensitization: the nervous system amplifies pain signals even when the original tissue injury has healed or when no injury exists at all. That same glutamate dysregulation plays a central role in treatment-resistant depression.

This shared mechanism is why a single intervention targeting the glutamate system can affect both conditions. It's also why the combination of chronic pain and depression is so hard to treat with approaches that address only one side of the equation.

How NMDA receptor modulation interrupts chronic pain

NMDA receptors are found throughout the brain and spinal cord. Under normal conditions, they play essential roles in learning, memory, and synaptic plasticity. In chronic pain states, they become chronically activated, driving three problematic processes:

Central sensitization. Repeated pain signals cause NMDA receptors in the spinal cord to become hyperexcitable. Stimuli that shouldn't be painful (light touch, mild pressure, normal movement) begin registering as pain. Patients with fibromyalgia, CRPS, and neuropathic pain conditions often have this.

Wind-up. Repeated stimulation of pain fibers causes a progressive increase in perceived pain intensity. Each signal builds on the last. NMDA receptor activation drives it.

Maladaptive neuroplasticity. Long-term structural changes in the nervous system that lock it into pain-amplifying patterns. Healthy plasticity lets the brain learn and adapt. Maladaptive plasticity traps it.

Ketamine blocks NMDA receptors and can interrupt all three processes. That's mechanistically different from what opioids, NSAIDs, gabapentinoids, or traditional antidepressants do. It's not numbing the pain temporarily; it's targeting the neural circuits that have gotten stuck amplifying it.

Conditions that tend to respond

Research and clinical experience suggest ketamine therapy may benefit patients with several chronic pain conditions, particularly those involving central sensitization.

Fibromyalgia. Widespread musculoskeletal pain, fatigue, and cognitive symptoms. Central sensitization is thought to be a primary driver, which makes fibromyalgia a promising target for NMDA modulation.

Neuropathic pain. Damage or dysfunction in nerves themselves: diabetic neuropathy, post-herpetic neuralgia (shingles aftermath), chemotherapy-induced peripheral neuropathy. All involve NMDA-mediated changes in how pain signals are processed.

Complex regional pain syndrome (CRPS). One of the most debilitating chronic pain conditions. Typically develops after an injury and produces pain disproportionate to the trauma, along with skin color, temperature, and swelling changes. Ketamine has been studied extensively for CRPS; some patients experience significant and durable relief.

Chronic migraine and certain headache disorders. Particularly when they co-occur with depression or have proven resistant to conventional treatments. Pain conditions also frequently overlap with insomnia, which can compound suffering and which ketamine often improves.

Where ketamine isn't the right tool

Ketamine therapy isn't appropriate for every type of pain. A few categories typically call for different approaches:

Acute pain from recent injury. Standard analgesics and physical recovery are the right tools.

Cancer-related pain requiring palliative care. This has its own well-developed approach with oncology and palliative medicine.

Pain with a surgically correctable cause. Disc herniation, structural joint problems, entrapped nerves: fix the structural problem first.

Pain driven primarily by ongoing tissue damage. If the injury is still happening, NMDA modulation isn't targeting the right mechanism.

During your evaluation, we assess your specific pain condition to determine whether ketamine is likely to help. Our safety guidelines cover who is and isn't a good candidate in more detail.

Dosing for pain vs. dosing for depression

A common question: is dosing for chronic pain different from dosing for depression?

For depression, the sublingual doses used in at-home therapy have strong evidence for the neuroplastic changes that improve mood. Those changes typically begin at relatively modest doses and build across a series of sessions.

For chronic pain, particularly conditions with significant central sensitization, some patients benefit from a slightly different dosing approach. Pain-related NMDA receptor changes can sometimes require more sustained exposure to achieve a meaningful reset. That said, at-home sublingual therapy has shown meaningful results for many chronic pain patients, especially when pain co-occurs with depression (which it often does).

The at-home model has a practical advantage for pain patients that's worth naming: consistency. Chronic pain isn't episodic; it's present every day, and the neural patterns sustaining it require consistent intervention to shift. With at-home therapy, you can maintain a regular treatment schedule without the burden of traveling to a clinic while in pain, which for many patients is itself a significant barrier.

We titrate dosing based on your specific condition, your response, and any other medications you're taking.

Why treating pain and depression together often works

Traditional medicine tends to silo chronic pain and depression into separate treatment tracks. A pain specialist prescribes one set of medications; a psychiatrist prescribes another. The two rarely communicate, and you're left managing a growing list of prescriptions that may interact unpredictably.

Ketamine addresses both conditions through a single mechanism. When a patient comes to me with fibromyalgia and major depression, there's no need to choose which to treat first. The same NMDA receptor modulation that promotes synaptic growth and reduces depressive rumination also reduces central sensitization and interrupts maladaptive pain signaling.

Patients commonly describe their relationship with pain changing as mood improves. Pain may not disappear entirely, but it becomes more manageable. The catastrophizing thoughts that amplify pain (the sense that it will never end, that nothing will help) begin to loosen their grip. This isn't wishful thinking. It reflects real neuroplastic changes in the brain circuits that process both emotion and pain, which are substantially overlapping to begin with.

What at-home treatment looks like

At-home ketamine for chronic pain follows the same general structure as treatment for depression. After an initial evaluation covering your medical history, current medications, and specific pain condition, you receive sublingual ketamine tablets to take at home on a prescribed schedule.

Each session runs about one to two hours, during which you rest in a comfortable quiet environment. Many chronic pain patients describe the sessions themselves as a welcome break from the constant experience of pain, even before the longer-term therapeutic effects appear. We monitor progress through regular check-ins and adjust the plan based on your pain levels, mood, and functional capacity.

The honest framing

Living with chronic pain is exhausting: physically, cognitively, and emotionally. If you've tried multiple treatments without adequate relief, ketamine may offer a different approach: one that targets the neural mechanisms sustaining your pain rather than layering another analgesic on top of them.

That said, ketamine isn't a cure, and it doesn't work for everyone. The same 25-30% non-response rate that applies to ketamine for depression applies here. If ketamine is going to help your pain, we usually know within four to six sessions. If it isn't, we'll tell you so and discuss alternatives.

Frequently Asked Questions

Which chronic pain conditions respond best to ketamine therapy?

The strongest evidence is for conditions driven by central sensitization, where the nervous system itself amplifies pain signaling rather than the original injury. Fibromyalgia (multiple trials show 40-60% pain reduction), complex regional pain syndrome / CRPS (some of the strongest evidence base, particularly for early-stage CRPS), and neuropathic pain (peripheral neuropathy, post-herpetic neuralgia, phantom limb pain). Migraine and chronic daily headache also show response, though usually as adjunctive therapy.

Which pain conditions don't respond well to ketamine?

Purely mechanical or structural pain (active disc herniation, acute fracture, untreated joint arthritis flare) typically doesn't respond to ketamine because the mechanism (tissue damage producing peripheral pain signals) isn't what ketamine modulates. Ketamine works on the nervous system's amplification of pain, not on the underlying tissue insult. For these conditions, addressing the structural issue surgically or with targeted intervention is usually the right path; ketamine may help adjunctively if a chronic pain syndrome develops afterward.

How does pain dosing differ from depression dosing?

Pain protocols generally use slightly higher doses and may extend the loading phase. Where depression often responds to 10+ sessions over 4-8 weeks, neuropathic pain or fibromyalgia frequently requires a similar or longer course, and may need more frequent maintenance afterward (every 4-6 weeks rather than monthly). The exact protocol is individualized: pain severity, condition type, response trajectory, and prior treatment history all factor in.

Will ketamine help my mood AND my pain?

Often, yes. Chronic pain and depression share substantial brain circuitry (the prefrontal cortex, anterior cingulate, and insula all contribute to both). Many patients with chronic pain develop secondary depression, and chronic depression amplifies pain perception. Ketamine acts on the shared NMDA-receptor / glutamate axis underlying both, so improvement in one often produces improvement in the other. Patients who came in for pain frequently report mood improvement they didn't expect, and vice versa.

Ready to find out if at-home ketamine fits your pain?

If you want to find out whether at-home ketamine is a reasonable next step for your chronic pain, here's the entry point. The evaluation is thorough and the answer is honest.

• Eligibility check: tovanihealth.com/eligibility (5 minutes, FL and NJ residents)
• Phone: 561-468-6981
• What you get back: an honest answer about whether ketamine's mechanism fits your specific pain condition.

Benjamin Soffer, DO — Tovani Health

Related reading: safety protocols, what to expect in a consultation, what the experience feels like, what if it doesn't work.