Propofol is not a pain reliever. It is a sedative-hypnotic: a drug that brings on sleep and memory loss (amnesia). It is not approved or used as a painkiller (analgesic). That is why patients sedated with propofol still get a separate drug to control pain.1 That one fact clears up almost everything confusing written about this drug. Propofol can make a person stop reporting pain without doing much to the pain itself.
How does propofol work if it is not a painkiller?
Anesthesia is not one effect. It is a bundle of separate effects, and different drugs deliver each one to a different degree. The bundle is: being knocked out, memory loss, muscle relaxation, dulled reflexes, and pain relief. A drug can deliver some of these and not others. Propofol leans toward the first two. Its label admits that no one fully knows how it works, which is true of all general anesthetics. Propofol is thought to work by boosting GABA, the brain’s main calming messenger, at the GABA-A receptor.1 Turning up that calming signal broadly quiets the outer brain (cortex). First comes sedation, then you are knocked out. But it does not specifically cut the pain pathways that carry a signal from tissue to spinal cord to brain. Opioids act on opioid receptors in those pathways. Local anesthetics block sodium channels in the nerve itself. Propofol does neither.
The FDA-approved label says the same. Propofol is approved to start and maintain general anesthesia. It is approved for monitored anesthesia care sedation and for sedation alongside regional anesthesia. It is approved for ICU sedation of adults on a breathing tube and ventilator. Pain is not on the list.1
Do patients sedated with propofol still need pain medication?
The clearest proof sits in the drug’s own label. In the studies behind propofol for ICU sedation, patients were sedated nonstop, sometimes for days. Some reports said they needed less pain medicine. But the label records that most patients still got opioids for pain while they stayed sedated. Morphine or fentanyl was given as needed.1
That is the practical answer, and it is worth stating in full. Propofol may lower how much pain medicine a deeply sedated patient needs. It did not replace it. The label also notes that less propofol may be needed when pain is well controlled with pain drugs1. The link runs both ways. That is what you expect from two drugs doing two jobs, not one drug doing both.
Does propofol change how you feel pain?
The lab studies do not agree with each other. The honest move is to say so instead of picking the study that flatters the drug. A 1991 study enrolled nineteen people. Twelve got low, below-sleep (subhypnotic) doses of propofol and thiopental. Seven got saline. In those who got the drugs, both raised the pain threshold to argon laser stimulation. Both also shrank the brain’s electrical response to the pain (the pain-evoked potential).2 Read alone, that looks like pain relief.
A better-controlled 2005 crossover study pointed the other way. Eighteen people got propofol by a pump set to two sedation levels. They rated heat pain on a visual analog scale (a simple pain rating line). Pain ratings rose from 28/100 on placebo to 35/100 with mild sedation and 40/100 with moderate sedation. How unpleasant the pain felt rose too. The authors called this unexpected. They said it shows sedated patients need real pain control.3
Sedated patients look comfortable. Yet in that study, the pain they reported got worse. A drug that changes how a person reports or remembers pain does not reduce pain. The same point matters in opioid-induced hyperalgesia.
Is propofol used to treat migraine?
The pain research on propofol is not about chronic pain in general. It is almost all about stopping severe headache attacks after everything else failed. The interest began with an uncontrolled 2000 report from an outpatient headache clinic. There, 77 patients with stubborn (intractable) headache got low-dose IV propofol, averaging 110 mg. Reported headache strength dropped by 95.4% on average. 63 of 77 said the headache was gone.4 Striking numbers. They are also just the kind of uncontrolled result that shrinks once a study is blinded.
It did shrink. A 2018 randomized trial in 66 children found low-dose propofol did no better than standard care at cutting pain, 51% versus 59%. Propofol was associated with fewer rebound headaches at 24 hours, 25.0% versus 66.7%.5 A 2021 double-blind trial compared propofol with a look-alike intralipid placebo in 40 adults with acute migraine. Propofol did not win on the main goal, headache gone at one hour, 24% versus 32%. It did beat placebo on a side goal: a pain score drop of two points or more, 81% versus 37%.6
A 2020 systematic review of nine studies and 290 patients drew three points. Propofol may work as a rescue drug for acute migraine in the emergency department. But its place in care is unknown, since doses varied and the studies were small. And its safety in this setting has not been studied well enough.7 A drug review called it an option for super-refractory migraine, used when standard drugs fail. It also noted the thin line between a working dose and a harmful one (a narrow therapeutic index). It noted abuse potential, too. And it noted the lack of adequate double-blind studies proving it works.8
Two points matter. All of this is emergency or hospital rescue for one attack. It is not ongoing care for chronic pain. And even there, the controlled evidence is thin and mixed. If you live with severe repeat headaches, the treatments with real outpatient evidence are a different set entirely. They are covered on our migraine and headache page and our cluster headache page.
The one chronic-pain signal, and why it went nowhere
A 1995 placebo-controlled, double-blind study gave low (subhypnotic) doses of propofol to 32 patients with chronic pain not caused by cancer. The authors reported that central pain was at least partly controlled. Central pain is pain made by damage to the brain or spinal cord itself. Nerve (neuropathic) pain was not controlled. The authors said propofol might help sort out the diagnosis in unclear cases.9
That was thirty years ago, in 32 patients, and it never became a treatment. When a finding that interesting fails to reach the clinic in three decades, that tells you something.
The HCN1 discovery is real, and it is not a pain result
A 2024 study in Nature used cryo-electron microscopy and electrophysiology to map how propofol works on the HCN1 channel. Propofol blocks the channel by fitting into a groove between two of its coils (transmembrane helices). It also restored normal voltage-dependent closing in two HCN1 variants associated with epilepsy.10 This is elegant lab science, and it points to a site a drug could target.
It is also bench work in cells, testing epilepsy-linked channel variants. It did not treat pain, or patients. A binding site found in a cell line is years and several failure points away from a therapy. This work suggests a target, not a treatment. Nerve pain driven by faulty channels is a different problem with a different cause. We work it up with electrodiagnostic testing instead of a sedative.
Why isn’t propofol used to treat chronic pain?
Even if it worked, what it takes to give it rules it out for ongoing use.
- It requires anesthesia-trained personnel. For general anesthesia or monitored anesthesia care, the label says only people trained to give general anesthesia may give propofol. And that person cannot be the one doing the procedure.1
- It requires airway rescue capability on hand. Sedated patients must be watched nonstop. Gear to keep the airway open, breathe for the patient, give oxygen, and restart the heart must be right at hand.1
- There is little safety margin. Propofol has a narrow therapeutic index: little room between a working dose and a harmful one.8 Breathing often stops (apnea) as the drug takes hold, and the patient needs help to breathe. It may last beyond 60 seconds. The dose needed also varies from person to person.1
- It is misused, with high lethality. A survey reached all 126 US academic anesthesiology programs, with a 100% response rate. 18% reported propofol abuse or diversion (drug taken for misuse) in the prior decade. Of 25 people identified, 7 died. And 71% of programs had no system to control or track propofol supplies.11
- The drug itself hurts. Pain and burning at the injection site are known side effects,1 so common that a whole body of randomized trials exists just on preventing it.12
A treatment for a long-term condition has to be safe to repeat. A drug that needs an anesthesia provider and rescue gear for every dose is not.
What actually treats refractory pain
People who search for propofol usually are not after propofol. Standard treatment has failed them, and they want something stronger. That is a fair place to be, and it has better answers.
Interventional pain medicine works by cutting off or turning down the exact source of the pain. It does not sedate the whole brain. Based on what drives the pain, that can mean a diagnostic or therapeutic nerve block, a sphenopalatine ganglion block for some head and face pain, an epidural steroid injection for pain from a pinched spinal nerve, or spinal cord stimulation when pain lasts despite other treatment.
There is one anesthetic that truly does relieve pain, and it is not propofol. Ketamine acts at the NMDA receptor. That receptor sits right in the pathway that keeps central sensitization going. Central sensitization is when the nervous system gets stuck turned up. Pain medicine uses ketamine for that reason, including for complex regional pain syndrome and RSD. Our ketamine therapy page and this overview of how ketamine may help with chronic pain cover how it works and its limits.
If you are in the St. Louis area
Padda Institute, Center for Interventional Pain Management, treats hard-to-treat pain at 4477 Woodson Rd, Suite 100, St. Louis, MO 63134 and at 12174 Natural Bridge Rd, St. Louis, MO 63044. We do procedures under local anesthesia, not general anesthesia or sedation. Patients stay awake and can tell us what they feel during treatment. Review the options on our pain treatments page or request an appointment. Call (314) 481-5000.
Frequently asked questions
Does propofol help with pain?
Not directly. Propofol is a sedative-hypnotic, not a painkiller. Sedated patients still get separate pain medicine.1 It can stop a person from reacting to or remembering pain. That is not the same thing. For treatments that target the source of pain instead of awareness, see our pain treatments overview.
Why do some studies say propofol reduced pain?
A few did, and they were mostly small or uncontrolled. Tested against placebo in a blinded migraine trial, propofol failed its main goal,6 and a sedation study found pain ratings went up.3 Uncontrolled pain results routinely shrink once a study is blinded. That is why we flag the quality of evidence on pages like our migraine and headache page.
Is propofol used for chronic pain?
No. Its only pain use is hospital or emergency rescue for one severe headache attack that has not responded to other drugs. Even there, the evidence is mixed.7 Chronic pain is treated with outpatient care that can be safely repeated. See the range on our pain treatments page.
Is ketamine different from propofol for pain?
Yes, in how it works. Ketamine blocks the NMDA receptor, which plays a direct role in central sensitization. That gives it pain-relieving power that propofol lacks. We cover its uses and limits on our ketamine therapy page and in this article on intranasal ketamine for refractory headaches.
Will I be sedated with propofol for a pain injection?
Not at our practice. Interventional injections are performed with local anesthetic while you stay awake. That way you can tell us what you feel during the procedure. Our nerve block page explains how these procedures are done.
Does the 2024 Nature HCN1 study mean propofol will treat pain?
No. That study showed where propofol binds on the HCN1 channel. It also showed propofol restored normal gating in epilepsy-linked variants in cells.10 It did not test pain or treat patients. To talk about options that exist today, request an appointment.
Can you still feel pain while sedated with propofol?
Yes, the pain signal can still get through. Propofol quiets the brain as a whole, but it does not block the nerves that carry pain. In one sedation study, people rated heat pain as worse, not better, under mild and moderate propofol sedation.3 A sedated person may simply stop reporting or remembering pain. That is why patients under propofol sedation still get a separate pain medicine.1
Do you actually go to sleep with propofol?
Yes. Propofol is a sedative-hypnotic, which means it brings on sleep and memory loss. It is thought to work by boosting GABA, the brain’s calming messenger, at the GABA-A receptor. Turning up that calming signal causes sedation first and then knocks you out. That is why propofol is used to start and maintain general anesthesia.1 Sleep is not pain control, though, so a separate drug still handles the pain.
Does a propofol injection burn?
It can. Pain and burning where the drug goes into the vein are known side effects on propofol’s FDA label.1 The problem is so common that researchers have run a whole series of randomized trials just on preventing it.12 That is one more reason propofol is a poor fit for repeated pain treatment: the drug itself can hurt going in.
Sources
- DIPRIVAN (propofol) injectable emulsion, USP — full prescribing information. Fresenius Kabi USA, LLC. US Food and Drug Administration / DailyMed. DailyMed label
- Anker-Møller E, Spangsberg N, Arendt-Nielsen L, Schultz P, Kristensen MS, Bjerring P. Subhypnotic doses of thiopentone and propofol cause analgesia to experimentally induced acute pain. British Journal of Anaesthesia. 1991;66(2):185-8. PMID 1817618
- Frölich MA, Price DD, Robinson ME, Shuster JJ, Theriaque DW, Heft MW. The effect of propofol on thermal pain perception. Anesthesia & Analgesia. 2005;100(2):481-486. PMID 15673879
- Krusz JC, Scott V, Belanger J. Intravenous propofol: unique effectiveness in treating intractable migraine. Headache. 2000;40(3):224-30. PMID 10759925
- Sheridan DC, Hansen ML, Lin AL, Fu R, Meckler GD. Low-dose propofol for pediatric migraine: a prospective, randomized controlled trial. The Journal of Emergency Medicine. 2018;54(5):600-606. PMID 29456086
- Meek R, Graudins A, McDonald M, McGannon D, Limm E. Comparing propofol with placebo for early resolution of acute migraine in adult emergency department patients: a double-blind randomised controlled trial. Emergency Medicine Australasia. 2021;33(3):465-472. PMID 33070469
- Piatka C, Beckett RD. Propofol for treatment of acute migraine in the emergency department: a systematic review. Academic Emergency Medicine. 2020;27(2):148-160. PMID 31621134
- Dhir A. Propofol in the treatment of refractory migraine headaches. Expert Review of Neurotherapeutics. 2016;16(9):1007-11. PMID 27454834
- Canavero S, Bonicalzi V, Pagni CA, et al. Propofol analgesia in central pain: preliminary clinical observations. Journal of Neurology. 1995;242(9):561-7. PMID 8551317
- Kim ED, Wu X, Lee S, et al. Propofol rescues voltage-dependent gating of HCN1 channel epilepsy mutants. Nature. 2024;632(8024):451-459. PMID 39085604
- Wischmeyer PE, Johnson BR, Wilson JE, et al. A survey of propofol abuse in academic anesthesia programs. Anesthesia & Analgesia. 2007;105(4):1066-71. PMID 17898389
- Wang W, Zhou L, Wu LX, Wang T, Zhang CB, Sun L. 5-HT3 receptor antagonists for propofol injection pain: a meta-analysis of randomized controlled trials. Clinical Drug Investigation. 2016;36(4):243-53. PMID 26860485
Dr. Gurpreet Singh Padda, MD, MBA, MHP
