Nerve block vs Botox for migraine: how to choose
Key takeaways
- Nerve blocks deliver fast relief, often within minutes to hours, and last two weeks to three months. They are used for acute treatment, short-term prevention, and to confirm a diagnosis before starting longer therapies.
- OnabotulinumtoxinA (Botox) is FDA-approved for chronic migraine prevention. It takes effect over one to two weeks, with benefits lasting about three months per treatment cycle.
- Nerve blocks can be given as needed or monthly. Botox is administered every 12 weeks on a fixed schedule.
- Many headache specialists combine both. A nerve block can give immediate relief while waiting for Botox to take effect, or treat breakthrough attacks during ongoing Botox therapy.
- Both are in-person procedures. Haven provides nerve blocks and Botox for chronic migraine at its Orange County, Los Angeles, San Diego, and San Francisco Bay Area locations.
When you live with frequent or daily migraine attacks, you want relief that works, and you want to understand your options.
Two of the most common injectable therapies headache specialists use are nerve blocks and OnabotulinumtoxinA (Botox for chronic migraine). Both involve injections around the head and neck. But they work in different ways, take effect on different timelines, and serve different roles in a comprehensive treatment plan.
This guide compares nerve blocks and Botox side by side so you can have an informed conversation with your clinician.
What are nerve blocks and Botox?
Nerve blocks
A nerve block is an injection of local anesthetic, often combined with a corticosteroid, delivered directly to nerves that transmit pain signals in the head and neck. Common targets include the occipital nerves (back of the head), trigeminal nerve branches (around the temples and forehead), and the sphenopalatine ganglion (behind the nose).
Nerve blocks are used to:
- Stop an active migraine attack or cluster headache cycle
- Provide short-term prevention while waiting for oral or injectable preventive medications to take effect
- Confirm that a specific nerve is involved before considering longer-term treatments such as nerve ablation or neuromodulation
- Reduce medication overuse by offering a non-oral rescue option
Botox for chronic migraine
OnabotulinumtoxinA (Botox) is a neurotoxin that temporarily blocks the release of certain pain and inflammatory molecules around nerve endings. In 2010, the FDA approved Botox specifically for adults with chronic migraine. ICHD-3 defines chronic migraine as 15 or more headache days per month, with at least eight meeting migraine criteria.¹
Botox is a preventive therapy. It does not stop an active attack. Instead, it reduces the frequency and severity of future attacks. It is administered every 12 weeks, following the standardized PREEMPT protocol of 31 injections across specific head and neck muscle sites.
Purpose: acute relief vs. long-term prevention
If you need immediate relief from a severe attack or cluster cycle, a nerve block is the better choice. If you have 15 or more headache days per month and are looking to reduce how often attacks occur, Botox is designed for that role.
Who is a candidate?
Nerve block candidacy
Nerve blocks may be appropriate if you:
- Have an active severe migraine attack or cluster headache cycle that has not responded to oral or nasal acute medications
- Experience frequent attacks localized to areas supplied by the occipital or trigeminal nerves
- Need short-term prevention while starting a new preventive medication that takes weeks to work (such as a CGRP monoclonal antibody or beta blocker)
- Are overusing acute medications and need a non-oral rescue option to help break the cycle
- Want to test whether a specific nerve pathway is contributing to your headaches before pursuing ablation or surgery
Nerve blocks are not typically used as standalone long-term prevention because their effects are temporary.
Botox candidacy
Botox for migraine is FDA-approved and indicated for adults who meet the ICHD-3 definition of chronic migraine:¹
- 15 or more headache days per month
- At least eight days per month meeting migraine criteria (or responding to migraine-specific treatment)
- Symptoms present for at least three months
Botox is not FDA-approved for episodic migraine (fewer than 15 headache days per month), although some insurance plans or clinicians may consider off-label use in select cases.
You may be a strong candidate if:
- You have tried and not fully responded to at least two classes of oral preventive medications
- You have difficulty tolerating oral preventives due to side effects
- You prefer a treatment that does not require daily medication adherence
- You want to continue or start other preventive therapies, such as CGRP monoclonal antibodies, in combination
Botox is not appropriate if you have a neuromuscular disorder (such as myasthenia gravis or Lambert-Eaton syndrome), an allergy to botulinum toxin, or an active skin infection at planned injection sites.
Onset and duration of effect
TreatmentOnsetDurationNerve blockMinutes to hours; some people feel relief during or immediately after the procedureTwo weeks to three months, depending on the type of block and whether a steroid is includedBotoxOne to two weeks; peak benefit often seen around four to eight weeksAbout three months per treatment cycle
If you need relief today, a nerve block acts quickly. Botox requires patience. You will not feel a difference right away, and it may take two or three treatment cycles (six to nine months) to see the full preventive benefit.
What to expect during the procedure
Nerve block procedure
A nerve block is performed in-office and takes about 10 to 20 minutes. Your clinician will:
- Identify the target nerves based on your headache location and symptoms
- Clean the injection sites with an antiseptic
- Use a small needle to inject local anesthetic (such as lidocaine or bupivacaine) with or without a corticosteroid (such as dexamethasone or triamcinolone) near the nerve
- Ask you to rest for a few minutes and monitor for any immediate side effects
Most people describe the injections as a quick pinch or pressure. You may feel warmth, tingling, or temporary numbness in the treated area. You can typically return to normal activities the same day, although some clinicians recommend avoiding strenuous exercise for 24 hours.
Botox procedure
Botox for chronic migraine follows the FDA-approved PREEMPT protocol. It uses 31 injections totaling 155 units of onabotulinumtoxinA, delivered across seven specific head and neck muscle groups (frontalis, corrugator, procerus, temporalis, occipitalis, cervical paraspinal, and trapezius). The procedure takes about 15 minutes.
Your clinician will:
- Mark injection sites following the standardized protocol
- Use a very fine needle to deliver small amounts of Botox just under the skin or into the muscle
- Apply light pressure to minimize bruising
The injections feel like small pinpricks. Some people experience mild soreness, redness, or bruising at the sites for a day or two. You should avoid lying down for four hours after the procedure and avoid strenuous activity or massaging the treated areas for 24 hours to prevent the toxin from migrating.
Clinical evidence
Nerve blocks
Nerve blocks have been used for decades in headache medicine, but the evidence base varies by block type and indication. A 2023 evidence review looked at greater occipital nerve blocks. It identified 13 qualifying studies. The reviewers concluded the technique is effective and safe for migraine, cluster headache, cervicogenic headache, and post-dural puncture headache. Questions remain about long-term efficacy, optimal dosing, and whether adding a corticosteroid improves outcomes.²
Nerve blocks are considered safe and effective for acute treatment and bridge therapy. But high-quality randomized controlled trials are limited compared with the evidence base for Botox.
Botox
Botox for chronic migraine has strong evidence from two large phase 3 trials (PREEMPT 1 and PREEMPT 2) that enrolled 1,384 adults with chronic migraine. In the pooled trial data, close to half of onabotulinumtoxinA-treated participants achieved a 50% or greater reduction in headache days. About a third of the placebo group reached that same mark.³ Longer-term follow-up through 56 weeks found that most participants who responded to treatment sustained meaningful improvements in headache-related disability and quality of life.⁴
Real-world data adds a useful, more current picture. A 2024 study followed 489 people using Botox for chronic migraine for more than five years. It found sustained reductions in monthly headache days, with no new safety concerns emerging even after long-term use.⁵
Based on the PREEMPT trials, Botox received FDA approval in 2010 for chronic migraine prevention. The American Headache Society and American Academy of Neurology both recognize Botox as an evidence-based preventive treatment for adults meeting chronic migraine criteria.
Safety and side effects
Nerve block safety
Nerve blocks are generally well tolerated. Common side effects include:
- Temporary numbness or tingling at the injection site
- Mild soreness or tenderness
- Bruising
Rare but serious risks include:
- Infection at the injection site
- Nerve injury (if the needle is placed improperly)
- Allergic reaction to the anesthetic or steroid
- Increased blood sugar or blood pressure (with corticosteroid use, particularly in people with diabetes or hypertension)
Because corticosteroids can raise intraocular pressure, nerve blocks with steroids are used cautiously in people with glaucoma.
Botox safety
Botox has been studied extensively for both cosmetic and medical uses. In the original PREEMPT trials, the most common side effects were neck pain, headache shortly after injection, and eyelid droop. Each affected a minority of participants.³ A longer-term real-world study followed patients for five years. It found somewhat higher rates with repeated use over time. About 1 in 6 people reported neck pain or a post-injection headache at some point. Roughly 1 in 12 reported eyelid ptosis, with muscle atrophy at injection sites reported less often. Even over five years of repeated treatment, this study found no new serious safety concerns. No one stopped treatment because of safety or tolerability problems.⁵
Serious adverse events are uncommon when Botox is administered by a trained clinician following the approved protocol. The toxin does not spread beyond the injection sites when proper technique and dosing are used.
Botox should not be used during pregnancy or breastfeeding, or in people with certain neuromuscular conditions.
Insurance and cost considerations
Nerve blocks
Most PPO, EPO, and Medicare plans cover nerve blocks for migraine when medically necessary, although prior authorization may be required. Because nerve blocks can be billed as either an office procedure or an injection code, out-of-pocket costs vary.
Cash-pay costs vary depending on the type and number of injections. Your care team can give you a specific estimate.
Botox
Botox for chronic migraine is covered by most commercial insurance plans, Medicare, and TRICARE when you meet the FDA criteria (15 or more headache days per month with chronic migraine diagnosis) and have tried at least two oral preventive medications.
Prior authorization is almost always required. Your clinician or care team will submit documentation of your headache frequency, prior treatments, and diagnosis to support the request.
Without insurance, Botox for migraine costs vary by treatment cycle (every 12 weeks), although the manufacturer (Allergan) offers a savings program for eligible patients. Your care team can give you a specific cash-pay estimate.
Haven is in-network with most PPO, EPO, Medicare, and TRICARE plans. If you have an HMO plan, you can still receive care on a cash-pay basis or through out-of-network benefits. Haven is not able to accept Medicaid or Medi-Cal at this time.
Can you use both?
Yes, and many headache specialists do combine nerve blocks and Botox.
Common scenarios include:
- Starting Botox: A nerve block can provide immediate relief while you wait for Botox to take effect over the first one to two weeks (or longer, if it takes multiple cycles to see full benefit).
- Breakthrough attacks: If you are on Botox but experience a severe attack or cluster of attacks mid-cycle, a nerve block can offer rescue relief without interrupting your Botox schedule.
- Testing response: Some clinicians use a nerve block to gauge whether blocking a specific nerve pathway helps before committing to a longer preventive therapy like Botox.
There is no contraindication to receiving both treatments. Your clinician will tailor the timing and combination based on your headache pattern, response to prior treatments, and treatment goals.
How to decide which is right for you
Choosing between a nerve block and Botox, or using both, depends on several factors:
Choose a nerve block ifChoose Botox ifYou need fast relief from an active severe attackYou have 15+ headache days per month and want to reduce future attack frequencyYou are starting a new preventive and need bridge therapyYou have tried at least two oral preventives without adequate responseYou want a diagnostic test before pursuing longer treatmentsYou prefer a treatment that does not require daily medicationYou experience localized pain in nerve-supplied areasYou want an FDA-approved preventive with strong clinical evidence
The best approach is to discuss your headache pattern, treatment history, and goals with a headache specialist who can evaluate your full clinical picture and design a personalized plan.
How Haven can help
Haven provides both nerve blocks and Botox for chronic migraine at in-person locations across Orange County, Los Angeles, San Diego, and San Francisco Bay Area.
Your care starts with a virtual consultation with a UCNS-certified headache specialist. Your clinician will:
- Review your headache history, triggers, and prior treatments
- Determine whether you meet criteria for Botox, would benefit from a nerve block, or should consider both
- Coordinate your in-person procedure at a Haven location near you
- Adjust your treatment plan based on your response, using daily text-based check-ins and your digital headache diary
You can text your care team anytime and get same-business-day responses. Your clinician will continue to monitor your progress and evolve your plan as your needs change.
Ready to talk with a headache specialist? Book a virtual consultation.
Frequently asked questions
How quickly do nerve blocks work for migraine?
Most people feel relief within minutes to hours after a nerve block. Some notice improvement during the procedure itself, while others see benefit over the next few hours as the anesthetic and anti-inflammatory medication take effect.
How long does it take for Botox to work for chronic migraine?
Botox begins to take effect one to two weeks after injection, with peak benefit often seen around four to eight weeks. Many people require two or three treatment cycles (six to nine months) to experience the full preventive effect.
Can I get a nerve block and Botox on the same day?
In most cases, yes. Some headache specialists will perform a nerve block and Botox during the same visit, particularly if you are starting Botox and need immediate relief. Your clinician will confirm the plan based on your treatment history and injection sites.
Are nerve blocks and Botox covered by insurance?
Most PPO, EPO, Medicare, and TRICARE plans cover both when medically necessary. Botox for chronic migraine almost always requires prior authorization and documentation that you meet FDA criteria. Nerve blocks may require prior authorization depending on your plan.
What happens if Botox or a nerve block doesn't work for me?
Not every treatment works for every person. If you do not respond to a nerve block, your clinician may try a different nerve target, adjust the medication, or explore other acute or preventive options. If Botox does not reduce your headache frequency after two or three cycles, your specialist will reassess and may recommend a different preventive therapy, such as a CGRP monoclonal antibody, oral medication, or neuromodulation device.
Can I still take my other migraine medications with Botox or nerve blocks?
Yes. Botox and nerve blocks are often used alongside acute medications (triptans, NSAIDs, gepants) and other preventive therapies (CGRP monoclonal antibodies, beta blockers, anticonvulsants). Your clinician will review all your medications to ensure there are no interactions and to optimize your overall treatment plan.
Do nerve blocks or Botox cure migraine?
No. Migraine is a chronic neurological condition with no cure. Nerve blocks and Botox can reduce the frequency, severity, and duration of attacks, but they do not eliminate the underlying disease. Many people continue treatment long-term as part of a comprehensive management plan.
Where does Haven provide nerve blocks and Botox?
Haven offers in-person nerve blocks and Botox for chronic migraine at locations in Orange County, Los Angeles, San Diego, and San Francisco Bay Area. Your initial consultation is virtual, and your care team will coordinate your procedure visit at the location most convenient for you.
Medically reviewed by: Alicia Chang, MSN, APRN, FNP-BC, FNP-C, CEN, PHN, Haven Headache & Migraine Center
Peer reviewed by: Samantha Clem, PA-C, AQH, Haven Headache & Migraine Center
References
- Headache Classification Committee of the International Headache Society. ICHD-3: The International Classification of Headache Disorders, 3rd edition. https://ichd-3.org/
- Castillo-Álvarez F, Hernando de la Bárcena I, Marzo-Sola ME. Greater occipital nerve block in the treatment of headaches. Review of evidence. Med Clin (Barc). 2023;161(3):113-118. https://doi.org/10.1016/j.medcli.2023.04.001
- Diener HC, Dodick DW, Lipton RB, et al. Benefits Beyond Headache Days With OnabotulinumtoxinA Treatment: A Pooled PREEMPT Analysis. Pain Ther. 2020;9(2):683-694. https://doi.org/10.1007/s40122-020-00198-w
- Silberstein SD, Diener HC, Dodick DW, et al. Sustained benefits of onabotulinumtoxinA treatment in chronic migraine: An analysis of the pooled Phase 3 PREEMPT randomized controlled trials. Headache. 2024;64(7):838-848. https://doi.org/10.1111/head.14743
- Navarro-Pérez MP, González-Quintanilla V, Muñoz-Vendrell A, et al. Long-term safety of OnabotulinumtoxinA treatment in chronic migraine patients: a five-year retrospective study. Front Neurol. 2024;15:1417831. https://doi.org/10.3389/fneur.2024.1417831
This article is for general education and is not medical advice. It is not a substitute for care from a qualified health professional. Always talk with your clinician before starting, stopping, or changing any treatment. If you have a sudden, severe headache, the worst headache of your life, or a headache with new symptoms like weakness, trouble speaking, or vision loss, seek emergency care right away.
Living with headache or migraine? The specialists at Haven Headache & Migraine Center are here to help. *Book a virtual consultation.*