Adverse effect profile of Lidocaine injections for occipital nerve block in occipital neuralgia
© Springer-Verlag 2010
Received: 10 May 2010
Accepted: 9 July 2010
Published: 28 July 2010
To determine whether there are differences in the adverse effect profile between 1, 2 and 5% Lidocaine when used for occipital nerve blocks (ONB) in patients with occipital neuralgia. Occipital neuralgia is an uncommon cause of headaches. Little is known regarding the safety of Lidocaine injections for treatment in larger series of patients. Retrospective chart analysis of all ONB was performed at our headache clinic during a 6-year period on occipital neuralgia patients. 89 consecutive patients with occipital neuralgia underwent a total of 315 ONB. All the patients fulfilled the IHS criteria for Occipital Neuralgia. Demographic data were collected including age, gender, and ethnicity. The average age of this cohort was 53.25 years, and the majority of patients were females 69 (78%). Ethnicity of patients was diverse, with Caucasian 48(54%), Hispanics 31(35%), and others 10 (11%). 69 patients had 1%, 18 patients had 2% and 29 patient were given 5% Lidocaine. All Lidocaine injections were given with 20 mg Depo-medrol and the same injection technique and location were used for all the procedures. Eight patients (9%)had adverse effects to the Lidocaine and Depo-medrol injections, of which 5 received 5% and 3 received 1% Lidocaine. Majority of patients who had adverse effects were female 7(87%), and had received bilateral blocks (75%). ONB is a safe procedure with 1% Lidocaine; however, caution should be exerted with 5% in elderly patients, 70 or older, especially when administering bilateral injections.
KeywordsOccipital neuralgia Adverse effects Lidocaine Occipital nerve block
Occipital nerve blocks (ONB) have generated great interest among headache specialists recently because of their potential to treat many types of intractable headaches [1, 2]. Injections are performed by targeting the greater occipital nerve (GON), derived from the dorsal ramus of the second cervical nerve root, which exits the back of the head. It is a relatively uncommon procedure, and recently literature has been emerging on the efficacy of this procedure for various types of headaches. However, even less is known about the adverse effect profile of this procedure. Neuropathic pain in the back of the head along the distribution of the occipital nerves is called Occipital neuralgia  and one of the criteria for diagnosis is response to ONB. Occipital neuralgia may be associated with migraine headaches complicating the picture of a chronic daily headache patient [4, 5].
In this study, we proposed to investigate whether there were differences in the side effect profile between different strengths of Lidocaine and whether there was a specific population that was more likely to have side effects. To our knowledge, this is the first study reporting on the side effect profile of 5% Lidocaine for ONB in a large case series of patients.
The study sample consisted of retrospective chart review of 89 consecutive patients presenting to our headache clinic at the University of California during 2005 to January 2010 with occipital neuralgia as determined by the International headache society criteria (IHS). The IHS criteria for occipital neuralgia include: (1) unilateral headache, continuous or paroxysmal, (2) diminished sensation or dysesthesia in the affected area, (3) circumscribed tenderness over the GON as it crosses the superior nuchal line, (4) relief of acute attack by local anesthetic blocks . The study was approved by the Institutional Review Board of University of Southern California. Demographic data were collected including age, gender, and ethnicity.
All procedures were done using the same landmarks and technique. Injections were performed at the junction of medial and middle thirds from a line drawn between the mastoid process and the nuchal line and the procedure was performed by the same clinician. Vital signs were taken prior to the procedure. All patients had tenderness over GON. Patients with adverse events (AEs) were monitored after the procedure.
We defined a set of clinical and demographic factors that may potentially be associated with AE and that were available from chart review. Besides patient demographic information (age, gender, and ethnicity), we collected data on the location of ONB (whether unilateral or bilateral) and the number of times ONB was given to each patient. Samples t test was performed to determine correlation analyses between Lidocaine dose and occurrence of AEs and age. Chi-square test was performed to determine correlation analyses between occurrence of AEs and non-contiguous variables. All statistical testing was performed at a two-sided 5% level of significance using Statistical Analysis System version 11.1 (SAS Institute, Cary, NC).
No. of subjects
Total no. of blocks
Age in years, mean (SD)
Female, no. (%)
Race, no. (%)
Adverse effect description for 1, 2, and 5% Lidocaine
Side effect description
Dizziness, blurring of vision, slurred speech
Dizziness, slurred speech, lightheaded, and extreme numbness of her head
Hypertension, slurred speech, numbness, asterixis
Hypertension, dizzy, lightheaded
Dizziness, blurring of vision, slurred speech
Headache, tense and tight neck muscles
We report no statistically significant correlation between Lidocaine dose and occurrence of adverse effects, though there was a slight trend toward more adverse effects in the Lidocaine 5% group (p = 0.072) compared to the Lidocaine 1% group (p = 0.33). There was no significant correlation between the occurrence of AEs and age, gender or bilateral versus unilateral injections. All our subjects, including those who had side effects reported complete pain relief for at least 3–7 days, the maximum period of pain relief being 33 days.
Review of occipital nerve block adverse events in literature
Saadah, Taylor 
Total 188 injections: (post-traumatic, 11; tension, 85; postinfectious, 20; unclassifiable 13)
Generally, dizziness for 1–2 h, injection site soreness for 1–2 days
10 mL 1% LC + 12 mg BM, divided among ONs. Total volume 12 cc per injection set
LC + MP to 180 pts
MP to 180 pts
LC during HA, 50 pts
IM MP alone
Chronic cluster, 20 pts
Migraine, 20 pts
8 pts—dizziness, gait uncertainty
3–4 mL 1% LC + 160 mg MP (4 mL) as separate injection (in thirds, with the needle directed straight, medially, and laterally) 5 min later or, if pt was ictal, after the LC aborted the HA. Area massaged after steroid injection
Leinisch-Dahlke et al. 
Tension, failed or intolerant to preventive therapy. 15 patients
Injection site pain in 3. Bradycardia 36 BPM
5 mL 1% prilocaine + 4 mg DM, total volume 6 mL per injection set
Ambrosini et al. 
Cluster, 10 pts
Local pain in 2 patients
0.5 mL 2% LC + 17.72 mg BM (12.46 BM dipropionate, long acting, 5.26 mg BM disodium phosphate), total volume 3 mL
Afridi et al. 
Total 116 injections Migraine, 57; Cluster; 22; New HA, 16; HC, 10.
2 pts—focal alopecia
3 mL 2% LC + 80 mg MP
Naja et al. 
Cervicogenic HA:47 pts received mean 5.3 (up to 13) injections
3 mL of the following 10 mL solution to each nerve: 3 mL 2% LC, 3 mL 2% LC + epi, 2.5 mL 0.5% BP, 0.5 mL fentanyl 50 μg/mL, 1 mL clonidine 150 μg/mL
Based on our data which shows that none of the patients receiving 2% Lidocaine had AEs, this may seem to be the “ideal” strength to use, but we cannot make that conclusion since the number of patients in the 2% Lidocaine group was much smaller than the other two groups. We suggest that there are multiple factors leading to adverse effects, with concentration being perhaps relatively minor, since some of our patients had AEs with 1% but tolerated 5% Lidocaine injection very well.
Dizziness is a common side effect with local Lidocaine injections and the most commonly reported adverse effect in our case series (Table 3). Naja et al.  reported 47 patients who underwent ONB with a combination of Lidocaine, epinephrine, fentanyl, and clonidine of which 2 reported dizziness. Anthony et al. [9, 10] had the large series of 180 patients and they reported 8 patients with dizziness and gait uncertainty with ONB using 1% Lidocaine and 160 mg MP. Saadah et al.  also had a large study in which a total of 188 ONB injections were done with 1% Lidocaine and 12 mg Betamethasone and reported dizziness for 1–2 h and injection site soreness for 1–2 days.
The side effect profile for Lidocaine when used for ONB was not listed in the Pharmaceutical Drug Reference, and on reviewing the package insert we did find dizziness, confusion, bradycardia and hypotension listed, but not elevation in blood pressure. In our study, the concentration and type of steroid remained the same for all patients, and therefore we believe that steroids were not likely the causation factor for the AEs, but this cannot be fully confirmed without comparing patients who received Lidocaine alone to those with a combination of Lidocaine and steroids.
Steroids have a mineral corticoid action and the intermittent hypertension developing within the few minutes of injection may be related to this and also given the close proximity of GON with the artery raises the possibility of arterial puncture, however, no reports were found on literature search. Patients who receive multiple blocks may need to be monitored for the development of a very rare side effect, Cushing’s syndrome. Lavin et al.  reported a case of 39-year-old female who had six bilateral GON blocks over a period of 3 months developed signs of Cushing’s syndrome with intermittent hypertension, severe muscle weakness, and fluid retention. Slurring of speech was observed in all our patients who developed intermittent hypertension and dizziness. Slurred speech is not listed as a side effect of local injection of Lidocaine or Depo-medrol in the package inserts.
Leinisch-Dahlke et al.  injected 15 tension headache patients, with prilocaine 1% and dexamethasone, and reported injection site pain in 3 and bradycardia in 1 patient during neck palpation. Ambrosini et al. reported local pain in two patients after injecting 13 patients for cluster headaches with 2% Lidocaine. None of our patients reported injection site pain. Other rare side effects reported in literature with ONB include alopecia. Afridi et al.  reported focal alopecia in 2 patients out of 116 injections with 2% Lidocaine and 80 mg methylprednisone. Cutaneous atrophy after corticosteroid injection ranges from 1 to 14% of patients and resolution is reported to occur in 6–7 months and may persist for 24 months[15, 16]. None of our patients reported these side effects, even though many of them had serial injections. To prevent this complication, injections should avoid leakage into the dermis.
Previous studies have failed to show that combining Lidocaine with steroid provided added benefit for ONB when compared to Lidocaine alone [17, 18]. However, these studies have different patient population, different steroid, different concentration, and there was lack of uniformity of technique. All our patients, even those who had adverse reaction to the injection reported response to injection. One patient who had received 1% Lidocaine and reported dizziness went onto receive 5% Lidocaine without any adverse effects. The data from this study show that Lidocaine injections are generally safe and well-tolerated, the commonest side effect being dizziness.
The clinical implication of distinguishing the side effect profile of different strengths of Lidocaine includes proper choice of subjects and proper pre-procedure instructions. We observed that all our patients who had side effects were on an empty stomach, and therefore we suggest the patients not to fast prior to undergoing this procedure. Based on our observation that most patients who had side effects had received bilateral injections at the same time, we now recommend that patients, who need bilateral injections, receive them at least 15–30 min apart, or on different visits. We also suggest that vital signs should be routinely monitored for 30 min post-procedure.
Our study limitations include the small sample size, the lack of a patient group who received only Lidocaine injections without steroids, and that we did not investigate disease parameters (disease duration and severity of pain) or treatment outcomes in our patients.
In conclusion, our study will also help remind the clinician that several types of Lidocaine injections are available for headache patient, and it is important to separate each element to tailor individualized treatment. Further studies comparing different concentration of Lidocaine with and without additional steroids are needed to address differences in long-term and adverse effect profile of this procedure.
We gratefully acknowledge Nerses Sanaossian M.D. for statistical analyses.
Conflict of interest
- Tobin J, Flitman S. Occipital nerve blocks: when and what to inject? Headache 2009:1–12Google Scholar
- Gawel MJ, Rothbart PJ (1992) Occipital nerve block in the management of headache and cervical pain. Cephalalgia 12:9–13, 10.1046/j.1468-2982.1992.1201009.x, 1559261, 1:STN:280:DyaK383hslSltA%3D%3DView ArticlePubMedGoogle Scholar
- Sahai-Srivastava S, Macwan S (2004) Atypical facial neuralgia. Pract Pain Manag 4(6):49–52Google Scholar
- Sahai-Srivastava S, Zheng L(2009) Occipital neuralgia with and without migraines: differences in pain characteristics and risk factors. Cephalalgia 29(suppl 1). AbstractGoogle Scholar
- Dash KS, Janis JE, Guyuron B (2005) The lesser and third occipital nerves and migraine headaches. Plast Reconstr Surg 115:1752–1758, 10.1097/01.PRS.0000161679.26890.EE, 15861086, 1:CAS:528:DC%2BD2sXkvVWhsA%3D%3DView ArticlePubMedGoogle Scholar
- Headache Classification Subcommittee of the International Headache society (2004) The international classification of headache disorders, 2nd edn. Cephalalgia 24(Suppl 1):9–160Google Scholar
- Choi YK, Liu J (1998) The use of 5% lidocaine for prolonged analgesia in chronic pain patients: a new technique. Reg Anesth Pain Med 23:3–6Google Scholar
- Naja ZM, El-Rajab M, Al-Tannir MA, Ziade FM, Tawfik OM (2006) Repetitive occipital nerve blockade for cervicogenic headache: expanded case report of 47 adults. Pain Pract 6:278–284, 10.1111/j.1533-2500.2006.00096.x, 17129309View ArticlePubMedGoogle Scholar
- Anthony M (2000) Cervicogenic headache: prevalence and response to local steroid therapy. Clin Exp Rheumatol 18:S59–S64, 10824289, 1:STN:280:DC%2BD3c3osVejsQ%3D%3DPubMedGoogle Scholar
- Anthony M (1992) Headache and the greater occipital nerve. Clin Neurol Neurosurg 94:297–301, 10.1016/0303-8467(92)90177-5, 1335856, 1:STN:280:DyaK3s7itFKlug%3D%3DView ArticlePubMedGoogle Scholar
- Saadah HA, Taylor FB (1987) Sustained headache syndrome associated with tender occipital nerve zones. Headache 27:201–205, 10.1111/j.1526-4610.1987.hed2704201.x, 3036748, 1:STN:280:DyaL2s3kvFOmtQ%3D%3DView ArticlePubMedGoogle Scholar
- Lavin PJ, Workman R (2001) Cushing syndrome induced by serial occipital nerve blocks containing corticosteroids. Headache 41:902–904, 11703480, 1:STN:280:DC%2BD3Mnlt1CjtQ%3D%3DView ArticlePubMedGoogle Scholar
- Leinisch-Dahlke E, Jürgens T, Bogdahn U, Jakob W, May A (2005) Greater occipital nerve block is ineffective in chronic tension type headache. Cephalalgia 25:704–708, 10.1111/j.1468-2982.2004.00941.x, 16109052, 1:STN:280:DC%2BD2Mvkt1agtw%3D%3DView ArticlePubMedGoogle Scholar
- Afridi SK, Shields KG, Bhola R, Goadsby PJ (2006) Greater occipital nerve injection in primary headache syndromes—prolonged effects from a single injection. Pain 122:126–129, 10.1016/j.pain.2006.01.016, 16527404, 1:STN:280:DC%2BD283jsFKktw%3D%3DView ArticlePubMedGoogle Scholar
- Louis DS, Hankin FM, Eckenrode JF (1986) Cutaneous atrophy after corticosteroid injection. Am Fam Physician 33:183–186, 3942046, 1:STN:280:DyaL287gtVantQ%3D%3DPubMedGoogle Scholar
- Jacobs MB (1986) Local cutaneous atrophy after corticosteroid injection. Postgrad Med 80:159–160, 3763512, 1:STN:280:DyaL2s%2Fhs1Ojtg%3D%3DPubMedGoogle Scholar
- Ashkenazi A, Matro R, Shaw JW, Abbas MA, Silberstein SD (2008) Greater occipital nerve block using local anesthetics alone or with triamcinolone for transformed migraine: a randomized comparative study. J Neurol Neurosurg Psychiatry 79:415–417, 10.1136/jnnp.2007.124420, 17682008, 1:STN:280:DC%2BD1c7otFaqtQ%3D%3DView ArticlePubMedGoogle Scholar
- Ambrosini A, Vandenheede M, Rossi P, Aloj F, Sauli E, Pierelli F, Schoenen J (2005) Suboccipital injection with a mixture of rapid- and long-acting steroids in cluster headache: a double-blind placebo-controlled study. Pain 118(1):92–96, 10.1016/j.pain.2005.07.015, 16202532, 1:CAS:528:DC%2BD2MXhtFOmt7zLView ArticlePubMedGoogle Scholar