Hemicrania continua, a rare but severe headache condition, literally means “continuous one-sided headache” in Latin. This chronic condition manifests as an intense, unrelenting pain concentrated on one side of the head, typically around the eye area. It is more common in women.
The condition often presents with distinctive features beyond the constant one-sided pain. Patients frequently experience:
- Redness and tearing of the affected eye
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Nasal congestion and runny nose
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Forehead and facial sweating
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Eyelid swelling
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Pupil size changes
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Restlessness or agitation
The diagnosis of hemicrania continua can be particularly challenging, especially when the only symptom is a one-sided headache. Doctors often misdiagnose it as migraine or tension headache because of its rarity and overlap with other headache types.
What makes hemicrania continua unique is its remarkable response to indomethacin, a powerful non-steroidal anti-inflammatory drug (NSAID). The response to this medication is so dramatic that hemicrania continua is one of two headache types that are called indomethacin-sensitive headaches.
While indomethacin is highly effective, some patients may experience stomach-related side effects. For those who cannot tolerate indomethacin, several alternatives exist:
- Other NSAIDs (though generally less effective)
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Boswellia, an herbal supplement with anti-inflammatory properties
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Botox injections
Chronic paroxysmal hemicrania shares features with hemicrania continua but differs in its pattern. It causes more intense pain attacks lasting minutes but occurring many times throughout the day. Like hemicrania continua, it also responds extremely well to indomethacin.
Read MoreDr. Messoud Ashina of the Danish Headache Center led a group of European researchers in analyzing the efficacy of migraine medications for treating acute migraine attacks. Their paper published in the British Medical Journal, “Comparative effects of drug interventions for the acute management of migraine episodes in adults: systematic review and network meta-analysis”, looked at 137 randomised controlled trials comprising 89,445 participants allocated to one of 17 active interventions or placebo.
They concluded that “Overall, eletriptan, rizatriptan, sumatriptan, and zolmitriptan had the best profiles, and they were more efficacious than the recently marketed drugs lasmiditan, rimegepant, and ubrogepant.”
When I decided to specialize in treating headaches in 1987, the options for the treatment of acute migraine attacks were very limited. We had NSAIDs, like aspirin and ibuprofen, opioids (narcotics), and ergotamines. Now, we have a cornucopia of options – seven triptans (the first in this group, sumatriptan, was introduced in 1992), three gepants, and one ditan.
Triptans work on serotonin receptors, gepants affect CGRP, and ditan, lasmiditan (Reyvow) works on a different serotonin receptor than triptans.
Over more than 30 years, triptans have proven to be exceptionally safe and effective. In many countries, they are sold without a prescription. Since patents for these drugs have mostly expired, they have become inexpensive.
Gepants were introduced almost five years ago. Ubrogepant(Ubrelvy) and rimegepant (Nurtec) came out first, and more recently, a nasal spray of zavegepant (Zavzpret) was added to this group. They also appear effective and safe, although they have not withstood the test of time like the triptans. And, because they are still protected by patents, they are costly. I don’t think that the prices are too high – if companies cannot recoup literally billions of dollars it takes to get FDA approval, no new drugs will emerge.
It is good to have all these options available because triptans do not work for about 30-40% of patients. For these people, gepants can be life-saving.
In the US, many insurers insist that a patient tries one or two triptans first before they will agree to pay for the more expensive gepants.
In the analysis, eletriptan came out first. However, even though a generic version was introduced in 2017, the cost has not come down as much as for sumatriptan or rizatriptan. Generic sumatriptan can be bought for $.60 a pill, while eletriptan costs $2 a pill. Another important point is that, despite low cost, insurance companies will cover 6 to 12 tablets a month. Some patients don’t realize that if they need more than this amount each month, they could buy extra by paying out-of-pocket, provided their doctor gives them a prescription for a higher amount.
In the US, eletriptan is available in 20 mg and 40 mg strengths. In some European countries, they come in 80 mg strength. The point is that taking two 40 mg tablets at once is not dangerous.
Some patients report that generics do not work as well as branded drugs. Others find that generics made by different manufacturers differ in their efficacy. The manufacturer’s name is always listed on the pill bottle dispensed by the pharmacy. The reason for this discrepancy is not necessarily due to different amounts of the active drug but rather due to inactive ingredients that hold the pill together. Some may not dissolve as fast or as completely as others. This is another reason why taking a higher-than-recommended dose may be necessary.
Triptans are safer than most over-the-counter drugs, such as ibuprofen (Advil), naproxen (Aleve), or Excedrin. They are safer for your stomach, kidneys, and heart.
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Two sets of “designer drugs” have been developed based on our understanding of the neurobiology of migraines. The first, sumatriptan (Imitrex), introduced in 1992, was the pioneer in a class of seven triptan drugs, all targeting serotonin mechanisms. Erenumab (Aimovig), which targets the CGRP (calcitonin gene-related peptide) mechanism, was approved by the FDA in 2018. This class now includes four injectable, three oral, and one nasal drug. Additionally, many older drugs, although not specifically developed for migraine treatment, have proven effective for some patients. Despite these numerous options, a significant minority of patients do not respond to any of these treatments.
This is why the development of drugs targeting different parts of the migraine cascade is so promising. Danish neurologists, led by Dr. Mesoud Ashina, have published results from a phase 2 double-blind study of a new drug that blocks PACAP (pituitary adenylate cyclase-activating peptide).
In this study, patients were divided into two groups, receiving an infusion of a placebo or two different doses of the active drug, currently known as Lu AG09222, developed by the Danish company Lundbeck. In the final analysis, the reduction in migraine days was compared between 94 patients who received a placebo and 97 patients who received the higher dose of the active drug. The higher dose significantly reduced the number of migraine days in the month following the infusion (6.2 vs. 4.2 days reduction). The side effects reported were mild and infrequent.
Phase 2 studies are relatively small and short in duration. The FDA typically requires two large parallel studies involving a total of 1,000 or more patients before considering approval. Therefore, even if Lu AG09222 is found to be safe and effective, it may not receive approval for another 2-3 years.
Read MoreThe FDA approved transcranial magnetic stimulation (TMS) to treat anxiety, depression, and OCD about 15 years ago. Most insurers cover this treatment. However, it remains highly underutilized.
Both treatments were combined with psychotherapy.
- 89 people with depression who hadn’t improved with at least two previous treatments took part.
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They were randomly assigned to either TMS or a new antidepressant.
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The treatment lasted eight weeks.
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TMS involved 25 sessions of magnetic stimulation.
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The medication group switched to a new antidepressant following standard guidelines.
The primary outcome measure was the degree of improvement in depression symptoms.
TMS was more effective than switching medications. More people responded well to MS (38% vs 15%) and more people’s depression went into remission with TMS (27% vs 5%).
TMS was better at improving symptoms of anxiety and lack of enjoyment (anhedonia)
Both treatments were equally effective for improving sleep, overthinking, and negative thought patterns. People’s expectations about their treatment were linked to how much their depression improved.
In conclusion, for people with depression that hasn’t responded well to a couple of medication attempts, TMS might be a more effective option than trying another antidepressant. The study also suggests that the choice between TMS and medication might depend on which specific symptoms a person struggles with most.
We started using TMS for people with migraine headaches if they do not respond to multiple standard therapies. About half of these patients respond well. However, we do not have large controlled trials to confirm that TMS effectively treats migraines.
Read MoreCandesartan ((Atacand) is a blood pressure medication in the class of angiotensin receptor blockers (ARBs). A recently published study involving 86 patients confirmed that candesartan can improve migraines. This was not a double-blind but rather an observational study, meaning that the results were not as reliable. However, the study is worth publicizing since candesartan is often overlooked as an effective migraine drug.
Here is more about candesartan from my previous post:
Candesartan was first shown to work for the prevention of migraine headaches in a 60-patient Norwegian trial published in JAMA in 2003. This was a double-blind crossover trial, which means that half of the patients were first placed on a placebo and then switched to candesartan and the second group started on candesartan and then were switched to placebo. This trial showed that when compared to placebo, 16 mg of candesartan resulted in a very significant reduction in mean number of days with headache, hours with headache, days with migraine, hours with migraine, headache severity index, level of disability, and days of sick leave. Candesartan was very well tolerated – there was no difference in side effects in patients taking the drug and those taking the placebo.
In another trial, the researchers compared candesartan to placebo as well as to propranolol, which is an FDA-approved blood pressure drug for the prevention of migraines. This trial in 72 migraine sufferers compared 16 mg of candesartan with placebo and 160 mg of propranolol. Candesartan and propranolol were equally effective in reducing migraine days per month and both were significantly more effective than placebo.
Read MoreA new study just published in Neurology showed that people taking proton pump inhibitors (PPIs) such as omeprazole (Prilosec) and esomeprazole (Nexium) have a 70% higher risk of having migraines or severe headaches. The risk was 40% higher with the use of H2 blockers such as famotidine (Pepcid) and 30% higher in those taking generic antacids.
The study analyzed data from 11,818 participants out of 31,127 in the National Health and Nutrition Examination Survey who were taking acid-suppressing drugs. Interestingly, those on H2 blockers had a higher migraine risk if they also had a higher intake of magnesium, though this finding was based on only 75 H2 blocker users, making it potentially unreliable.
The likely cause of the association between acid-suppressing drugs and headaches is the previously documented decrease in absorption of magnesium, vitamin B12, and other nutrients. PPIs have been also found to increase the risk of dementia.
These acid-suppressing drugs are available without a prescription and people assume that they are safe. They are indeed safe when used for short periods of time. Once a person starts taking PPIs, they are very difficult to stop because stopping them often leads to a rebound of acid production. This sometimes makes heartburn worse than before a PPI was started. One way to try to stop them is to switch to an H2 blocker and then, to an antacid such as Gaviscon or Rolaids.
For those who require long-term PPI use, supplementing with magnesium, sublingual vitamin B12, and a multivitamin may help mitigate potential nutrient deficiencies. Vitamin B12 is often poorly absorbed and getting a monthly injection is more reliable. Some of our migraine patients, even some who are not on acid-suppressing drugs, also require monthly infusions of magnesium.
Read MoreI will be speaking on nutritional supplements for migraines and an update on triptans on April 20, 2024.
Read MoreA recent national survey called the “Harris Poll Migraine Report Card” provides insight into the profound impact migraine has on people’s lives, especially those dealing with frequent attacks and high acute medication use. The survey compared those currently experiencing high-frequency migraine (8 or more attack days per month) and using acute medication on 10 or more days per month, to those who previously had this pattern but now have reduced attack frequency and medication use.
Most respondents were first diagnosed with migraine or headache disorders in their mid-20s. However, despite meeting criteria for migraine, one-third did not self-identify as having migraine disease. This underscores how migraine is still underrecognized and misdiagnosed, with people often being mislabeled with terms like “stress headache.”
Regardless of diagnosis, the burden was clear – over 50% reported a negative impact on their overall quality of life. What’s more, at least half had experienced anxiety or depression, with almost half to over half saying migraine negatively affected their mental/emotional health. These findings align with prior research showing a significant burden can start at just 4 monthly migraine days.
In an attempt to improve their condition, most made lifestyle changes like stress management, limiting caffeine and improving diet. However, their treatment choices differed – those with more frequent migraine were more likely to use newer acute treatments like gepants, diclofenac and dihydroergotamine compared to the other group using more NSAIDs, triptans and ergotamines. The high-frequency group was also more inclined to try non-pharmacological options like supplements, marijuana, massage and physical therapy.
The use of prophylactic medications was low in both groups – about 15%. There are several potential reasons including lack of access to neurologists or even primary care doctors, lack of efficacy and side effects of existing drugs, and clinicians not encouraging the use of preventive medications.
The difference between these two groups could at least in part relate to the older age of the previous high-frequency group (mean age, 47 years vs 41), as age-related improvement can occur over time.
Interestingly, the high-frequency group had poorer optimization of their current acute treatments compared to those who previously experienced high frequency but reduced their attack frequency.
This brings the controversial issue of acute medication overuse into focus – does the suboptimal acute treatment lead to frequent use of medications, rather than the current widely accepted dogma that postulates that frequent use leads to more frequent headaches?
There is evidence that caffeine and opioid analgesics make headaches worse. The evidence for triptans and NSAIDs is based purely on correlational studies. Yes, I occasionally see patients improve when they stop or reduce their intake of NSAIDs or triptans. More often improvement comes from instituting effective preventive therapies along with lifestyle changes. NSAIDs have been proven to be effective for the prevention of migraine attacks and I have dozens of patients whose migraines are well-controlled with daily prophylactic or acute use of triptans. The safety of triptans is greater than that of NSAIDs and most prophylactic medications such as antidepressants and epilepsy drugs.
The concept of acute medication “overuse” may be unhelpful and stigmatizing, as it suggests frequent attacks are the patient’s fault rather than a disease manifestation. Optimizing acute treatments may naturally reduce the need for frequent medication use as attacks improve.
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A study published in the current issue of JAMA Neurology examined the risk of stroke and myocardial infarction (heart attack) after starting a triptan. Triptans have been in use for over 30 years and include drugs such as sumatriptan (Imitrex), rizatriptan (Maxalt), and five others. In many countries, they are sold without a prescription. Danish researchers identified 429,612 individuals who redeemed their first prescription for a triptan.
Unlike all previous studies, they found a slight increase in the risk of stroke or heart attack. Surprisingly, in the abstract of this report, the authors present higher unadjusted numbers than in the discussion section. Of those 429,612 patients, 13 had a heart attack or a stroke within a week or two after they filled the prescription. This means that the risk is 1 in 30,000. Notably, patients who suffered from a stroke or heart attack were older than 60 and had risk factors for cardiovascular disease, such as hypertension, diabetes or previous heart attacks and strokes.
The authors concluded that their study supports the current US FDA recommendation that triptans should not be prescribed to patients with a history of coronary artery disease, transient ischemic attacks, or stroke. They also stated that their “findings do not raise concern” about triptan use in patients with low cardiovascular risk.
In a previous post, I mentioned a report that found NSAIDs such as ibuprofen, and naproxen to be more likely to cause major cardiovascular events than triptans in a ratio of 3.8 to 1. Fortunately, in high-risk patients, we can skip triptans and NSAIDs and use a new class of drugs to treat an acute migraine attack. CGRP antagonists do not increase the risk of cardiovascular events. These drugs are rimegepant (Nurtec), ubrogepant (Ubrelvy), and zavegepant (Zavzpret).
Read MoreA new report suggests that CGRP-blocking drugs (CGRP-A) are safe in pregnancy.
Triptans (drugs like sumatriptan or Imitrex and six others) were introduced over 30 years ago. We know from pregnancy registries, retrospective, and prospective observational studies that triptans are safe in pregnancy.
The WHO database had 467 safety reports of exposure to CGRP-A in pregnancy. Of these, 386 were reports of exposure to CGRP monoclonal antibodies (mAbs), 76 to gepants, and 5 to both. The authors found “…no signals of increased reporting with CGRP-A compared to triptans in relation to pregnancy”.
CGRP drugs represent a major breakthrough in treating migraine headaches. A large proportion of migraine sufferers are women of childbearing age. We always have to consider the effect of a drug on the developing fetus. Erenumab (Aimovig), the first drug in this category was introduced almost six years ago. This is a relatively short period to assess the safety of a drug in pregnant women and the current report is not a definitive proof of safety.
There might be a difference in safety between oral CGRP antagonists (gepants), which are small molecules and injectable mAbs, which are large molecules. Gepants have the advantage of being completely washed out of the body within a few days of stopping them. Monoclonal antibodies are injected every one or three months and can take a few months to completely leave the body. However, mAbs, being larger, cannot cross the placenta in the first trimester. So if a mAb is stopped at the beginning of pregnancy the exposure to the fetus will be small.
The gepants include ubrogepant (Ubrelvy), rimegepant (Nurtec), atogepant (Qulipta), and a nasal spray, zavegepant (Zavzpret). The monoclonal antibodies are erenumab, fremanezumab (Ajovy), galcanezumab (Emgality), and eptinezumab (Vyepti).
Read MoreA new study by Harvard researchers suggests that there is no connection between caffeine consumption and migraine headaches. I am not convinced. This study was small and had only 12 out of 97 participants consume 3-4 cups a day, while 65 consumed 1-2 cups and 20 consumed no caffeine. Statistics based on such small numbers are unreliable.
Most headache sufferers who drink large amounts of caffeine develop a caffeine-withdrawal headache when they don’t get their usual dose of caffeine on time. My most dramatic case was that of a man who drank about 10 cups of coffee a day. He also set an alarm for 3 AM to have a cup of coffee. If he skipped that 3 AM cup, he would wake up with a debilitating migraine.
A double-blind caffeine withdrawal study published in the New England Journal of Medicine. It showed that 52% of people consuming an average of 2.5 cups of coffee developed a moderate or severe headache when caffeine was stopped.
Caffeine can play positive role in the treatment of migraine and tension-type headaches. It is considered to be an adjuvant analgesic and is included in over-the-counter and prescription drugs along with pain medications. It enhances pain relief produced by acetaminophen, aspirin, and other pain drugs.
The problem arises from excessive intake of caffeine. Two cups of coffee at breakfast, a cup of caffeinated soda at lunch, and a couple of Excedrin do not appear excessive until you consider the total amount of caffeine in these products. If you are prone to headaches, this amount may be sufficient to cause a headache, typically upon awakening in the morning.
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