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Practical neurology Part 7 — Recurrent headaches with visual disturbance

Alessandro S Zagami and Sian L Goddard
Med J Aust 2012; 196 (3): 178-183.
doi:
10.5694/mja11.11533
Abstract
  • Headache, particularly migraine, is the commonest neurological problem with which patients present to general practitioners and neurologists. Episodic migraine affects up to 18% of women and 6% of men.

  • Acute migraine attacks can be severely disabling and chronic migraine is even more disabling. Of the mental and neurological disorders, migraine ranks eighth worldwide in terms of disability.

  • Migraine is one of the primary headaches and may occur with or without aura. Differentiation from other severe primary headaches, such as cluster headache, is important for management.

  • The vast majority of patients with migraine can be satisfactorily helped and treated. This involves acute and prophylactic drug therapy and management of triggers.

  • In patients with migraine, medication overuse headache and chronic migraine need to be identified and treated.

Rachel’s story

Rachel, who is aged 29 years, has had recurrent headaches and visual disturbance every 2 weeks or so for the past 8 years. Her headaches are usually one sided, in the frontotemporal region, but can affect either side and can even change sides during an attack. She describes them as “throbbing”. She always has associated nausea and often vomits when she takes oral medication. In addition, she is averse to light (photophobia), sound (phonophobia) and smells (osmophobia) during attacks. Most attacks wake her around 3 or 4 am. With daytime attacks, a visual disturbance is the first sign, which she describes as a patch of missing vision that enlarges into an arc like a bright shimmering light with a jagged edge. This can occur on the same or other side to the headache, and lasts 20 minutes. On some occasions, she develops numbness on one side of her body, which slowly spreads from her hand and arm up to the side of her face, lips and tongue, and similarly lasts about 20 minutes. Occasionally, she has difficulty with speech, concentration and decision making. The headaches start as these symptoms resolve; they usually last about a day (but up to 3 days) and they leave her feeling “washed out” for a day or so after.

Rachel first developed her headaches around the time of menarche. She was initially treated with the combined oral contraceptive pill because of bad headaches with her periods, but the pill worsened the headaches and was withdrawn. Stress is also a trigger. In addition, she has other (more frequent) headaches without aura, which she treats with ibuprofen. She has difficulty telling whether one of these will develop into one of the more severe headaches.

Because of the frequent and severe headaches, she has been avoiding going out and feels that her headaches are “ruling her life”.

She smokes 6–10 cigarettes per day but rarely drinks alcohol. Her mother and brother suffer from migraine. Results of her neurological examination are normal. Her body mass index is 26 kg/m2.

Approach to the problem
Making the diagnosis

Headache, particularly migraine, is the commonest neurological problem with which patients present to general practitioners and neurologists. Comprehensive history-taking offers the best chance of establishing whether a headache is primary (idiopathic) or secondary to an underlying condition. Most headaches encountered in practice are primary, either migraine headache or tension-type headache. Less common primary headaches include cluster headache, primary cough and exertional headache, primary sex headache and primary thunderclap headache. The second edition of The international classification of headache disorders provides a comprehensive description of the many types of headache.1

Important features in the patient history are: location, temporal pattern and quality of the pain; presence of associated symptoms; and presence of specific triggers (eg, exertion, coughing, sneezing). Red flags that may indicate a secondary headache are summarised by the mnemonic SNOOP4 (Box 1).2 When any of these red flags are present, brain imaging is mandatory (computed tomography or magnetic resonance, depending on how or when the patient presents, resource availability and clinical urgency). However, for most patients with migraine, brain imaging is not necessary.

Recognising the features of migraine headache

Migraine headache is defined by the features of the headache and the presence of associated symptoms (Box 2).1 Migraine is considered a primary disorder of the central nervous system (CNS). It is a chronic disorder with episodic manifestations, and it is often familial and has a strong genetic component. Episodic migraine affects up to 18% of women and 6% of men.

Neck pain is also very common in migraine — up to 60% of patients complain of occipital or neck pain during their migraine attacks and this is nearly always a referred pain. Pathological conditions of the upper cervical spine, which are uncommon, can cause headache; however, disorders of the cervical spine are not a common cause of migraine.

The manifestations of migraine are believed to be due to increased cortical neuronal excitability, owing to defective modulatory pathways in the brainstem and possibly other structures in the CNS. In particular, the aura of migraine is not due to vasospasm — it is due to altered neuronal activity called “cortical spreading depression”.3-5

For Rachel, the other features of her attacks that make the diagnosis of migraine definite are the change in sides of both the headache and aura. In addition to the headache phase, there are often premonitory and resolution phases.3,6 In some patients with migraine, nausea and vomiting are the most disabling features; in others, it is the aura or the severity of the headache.

Acute migraine attacks can be severely disabling, and chronic migraine is even more disabling. The World Health Organization ranks migraine as 19th worldwide of all the causes of years lived with a disability due to a medical condition and eighth of the mental and neurological disorders in terms of disability. In high-income countries such as Australia, the total disability due to migraine is said to be more than 1.5 times that due to multiple sclerosis and Parkinson disease combined and almost three times that due to epilepsy.7 However, it is considerably under-recognised, underdiagnosed and undertreated worldwide.

Differential diagnoses

The locations of migraine headache and other types of primary and secondary headaches are shown in Box 3.

It is important to distinguish migraine headache from cluster headache, as the approaches to management differ significantly. Cluster headache is one of the trigeminal autonomic cephalalgias,1 which are characterised by strictly unilateral headaches with autonomic features. It is differentiated from migraine by the duration and frequency of attacks. Cluster headache has such a dramatic presentation, and the headache is so excruciating, that it should never be missed. Patients can have up to eight attacks per day, with attacks lasting 15–180 minutes each. Nocturnal attacks that wake the patient are common. The patient is usually agitated and will pace about (in contrast to migraine, where the patient will lie still). Cluster headache is accompanied by redness or tearing of the eye, drooping of the eyelid and constriction of the pupil (Horner syndrome) on the ipsilateral side, and blockage or running of the nostril (autonomic features) on the ipsilateral side. Management of cluster headaches includes inhaled oxygen (100%, 12 L/minute, 15 minutes, grade A evidence)8 or acute sumatriptan therapy (6 mg, subcutaneous injection, grade A evidence), and oral verapamil for prophylaxis (grade A evidence).9

Migraine aura

Migraine aura, which is almost always (in more than 95% of cases) visual but sometimes involves other senses or speech, occurs in up to 30% of patients with migraine (Box 4).1 True weakness does not occur in typical migraine with aura, but may occur in hemiplegic migraine and basilar-type migraine, which are very rare.1

Aura symptoms usually consist of positive features (eg, flickering lights) and negative features (eg, scotomata). The symptoms develop over several minutes and spread gradually, but usually resolve within 60 minutes. The visual aura can be in one or both visual fields, although many patients describe it as being in one eye unless prompted to do the cover test (where the patient covers each eye in turn to observe whether the aura persists). The visual aura can be simple (unformed flashes or phosphenes) or complex (classical fortification spectra), as experienced by Rachel. Other sensory aura symptoms are usually unilateral and on the contralateral side to the headache, but they can sometimes be ipsilateral, as can visual aura. Aura symptoms may also alternate sides from one attack to the next. These characteristics help distinguish them from the symptoms of a transient ischaemic attack.

Patients who suffer migraine with aura can go on to have visual aura without headache in later years. Also, migraine aura without headache can occur for the first time in later life — the so called transient migrainous accompaniments.4 Such symptoms must firstly be considered as possibly being due to another neurological problem, such as a transient ischaemic attack or giant cell arteritis. Hence, patients with strictly unilateral headaches and contralateral aura, atypical aura, or first visual or other neurological disturbance with or without headache at over 50 years of age should be referred to a neurologist for urgent assessment and brain imaging, preferably with magnetic resonance imaging.

Complications of migraine
Chronic migraine

Chronic migraine is diagnosed when a patient known to have migraine without aura has headaches on 15 or more days per month for at least 3 months, of which eight or more per month meet the criteria for migraine without aura or respond to migraine-specific acute medication (triptans or ergot preparations).10 Its prevalence is 2% worldwide11 and patients with chronic migraine are more disabled, have a lower quality of life, have a higher rate of psychiatric comorbidity and use significantly more health care resources than patients with episodic migraine.12 About 2.5% of patients with episodic migraine will progress to chronic migraine over a year. Risk factors for progression include female sex, lower socioeconomic status and increased caffeine intake.11 Medication overuse is also an important contributor to development of chronic migraine.

Final Diagnosis

Migraine with aura

Medication overuse headache (MOH)

MOH is likely in patients who have headache on 15 or more days per month for more than 3 months, have been using acute medication therapies frequently and have had worsening of the headaches while using the acute medication.13 Frequent use of ergot preparations, opiates, triptans or combination analgesics is defined as 10 or more days per month and for simple analgesics 15 or more days per month. Many patients with MOH have daily headaches and take acute medication every day or nearly every day.

Prophylactic therapies are usually ineffective for migraine if MOH is present, and MOH is a risk factor for progression from episodic migraine to chronic migraine. An accurate patient history of all acute medication use (including paracetamol) and caffeine is needed. Some agents, including triptans, can lead to MOH and chronic migraine more quickly than others, such as simple analgesics or non-steroidal anti-inflammatory drugs (NSAIDs). In Australia, overuse of codeine-containing agents is particularly common and carries the added potential risk of dependency. Management of MOH involves education of the patient, appropriate prophylactic medication and withdrawal of the offending acute medication therapy. MOH can usually be managed in the outpatient setting, but hospital admission is sometimes needed for a dihydroergotamine (DHE) or lignocaine infusion.

Risk of stroke in migraine

The risk of stroke is increased in patients with migraine. According to a recent meta-analysis, there is a twofold increased risk of ischaemic stroke which occurs in patients with migraine with aura but not in patients with migraine without aura.14 Women are more at risk, particularly if they are young (under 45 years), smokers and taking the oral contraceptive pill. The overall absolute risk is, however, quite low, and stroke in young patients with migraine is rare.15

Rachel has migraine with aura, nocturnal severe migraine and other headaches of the tension type. Because of her frequent use of NSAIDs, the possibility of MOH was discussed and she was asked to start keeping a simple headache diary. For daytime attacks with aura, she was asked to take diclofenac potassium 50 mg tablets with domperidone 10–30 mg at the onset of her aura or as soon as she developed a migraine headache without aura. If she went on to develop a headache despite taking diclofenac at the onset of aura, she was to repeat the dose of diclofenac. She was encouraged to avoid using anything for milder headaches. For nocturnal attacks, she was asked to try ondansetron wafers and an indomethacin suppository (as oral therapy was futile).

Rachel required prophylaxis, but was reticent to accept such therapy because a previous trial of pizotifen had led to 8 kg of weight gain. Because of her frequent aura attacks, β-blocker therapy was not recommended. She agreed to start on low-dose amitriptyline (10 mg at night) in the first instance. The risk of stroke in migraine was discussed. The greatest risk is in younger women who suffer migraine with aura, and who smoke and use the combined oral contraceptive pill. She agreed to cease smoking.

Management
Management of episodic migraine

Patients with episodic migraine need to be given an explanation of the condition and a treatment plan, and the treatment goals need to be discussed. Online resources for patients are available from Headache Australia (http://headacheaustralia.org.au, see the iManage Migraine app), the World Headache Alliance (http://www.w-h-a.org) and the BMJ (http://www.bmj.com/multimedia/video/2011/02/05/migraine-pain-and-pressure). Treatment options for complicating factors are shown in Box 5.

Keeping a diary: A headache diary is invaluable for establishing baseline headache frequency, identifying patterns (such as an association of migraine attacks with menstruation), quantifying lost work time, monitoring treatment response, and identifying MOH.

Identifying triggers: The commonest triggers in migraine without aura are stress, foods (eg, alcohol, chocolate, dairy foods [particularly cheese]) and menstruation.6 In migraine with aura, a visual stimulus (eg, flickering light) is a common trigger. Triggers should generally be avoided, although an alternative behavioural approach of trying to cope with some triggers has been suggested.19 However, many patients cannot identify triggers, and some triggers may be complex (eg, a period of stress coinciding with menstruation). Only about 10% of women with migraine have pure menstrual migraine, where they only have attacks during menstruation.

Acute treatment: It is important to tailor the acute treatment to both the individual patient and to the different attacks experienced by the individual patient. Acute medication therapies in migraine are either non-specific (paracetamol, aspirin or other NSAIDs) or migraine-specific (ergot preparations and triptans) (Box 6). Initial treatment should be with simple analgesics and NSAIDs, taken at the earliest possible time (at onset of aura, if present). Suppositories can be helpful in patients with significant nausea or those who are already vomiting.

Antiemetic and prokinetic drugs are helpful in treating associated nausea and may improve the efficacy of analgesics, NSAIDs and triptans by overcoming associated gastroparesis. Antiemetics may also reduce the severity of the headache and should always be used if there is nausea. Local guidelines list oral domperidone 10–20 mg (grade B evidence), metoclopramide 10–20 mg (grade B evidence) and prochlorperazine 10 mg, and prochlorperazine 25 mg suppositories.17 Domperidone is much less likely than metoclopramide or prochlorperazine to cause a dystonic reaction or akathisia. Although only PBS listed for cytotoxic chemotherapy-related nausea and vomiting, ondansetron wafers are often the most effective antiemetic for some patients; however, cost is an issue.

Second-line agents for acute treatment are ergot preparations and triptans. No oral or rectal ergot preparations are commercially available in Australia, but compounded ergot preparations can be obtained. Triptans should be used if first-line agents have been ineffective after 1–2 hours or ineffective in previous attacks. Unlike the other acute medication therapies, triptans are generally ineffective if taken at the aura stage, but are effective during the headache phase.

Parenteral agents may be required for patients whose condition fails to respond to oral agents or who are vomiting and cannot tolerate oral agents. DHE 0.5–1 mg can be given by subcutaneous, intramuscular or intravenous injection — always with an antiemetic — or sumatriptan 6 mg can be given by subcutaneous injection.

Emerging treatments: With new treatments emerging, this is an exciting time in the field of migraine management. On the horizon are new classes of non-vasoconstrictor drugs, calcitonin gene-related peptide (CGRP) antagonists (“gepants”) and serotonin 1F receptor agonists, as well as novel neuromodulation techniques such as occipital nerve stimulators and transcranial magnetic stimulation.20

Treatment of status migrainosus

Status migrainosus is a debilitating migraine attack that lasts more than 72 hours and is refractory to the patient’s usual treatments.1 Hospital admission and treatment of dehydration with intravenous fluids are usually necessary. Parenteral administration of DHE, with an antiemetic, can be effective in this situation. Some guidelines suggest using 8-hourly intravenous injections of 0.25–1 mg DHE.17 However, in our experience, it is better tolerated as an infusion of 3 mg DHE over 24 hours (which can be titrated up or down according to response and adverse effects). Other options include parenteral chlorpromazine, droperidol, prochlorperazine and sumatriptan.17

Prophylaxis of episodic migraine

Patients who have three or more migraine attacks per month are usually considered as being suitable for prophylaxis. However, prophylaxis may also be warranted in patients who have fewer attacks — for example, if the attacks last days, do not respond to acute treatment, cause lost work time or are otherwise disabling. Conversely, patients who have more than three attacks per month that are all reliably aborted by acute treatment may not need prophylaxis. The aim of prophylactic treatment is not only to reduce the frequency of attacks but also to reduce severity and duration of the attacks and to render the attacks more amenable to acute treatment. The initial choice of prophylactic agent is usually based on side-effect profiles and patient characteristics. First-line prophylactic agents are serotonin reuptake inhibitors such as amitriptyline, other tricyclic antidepressants, 5-HT2-receptor antagonists (pizotifen) and β-blockers (propranolol and metoprolol) (Box 7).17,21-23 The β-blockers, however, are best avoided in patients who have frequent migraine with aura as they can worsen the aura.

It is appropriate for a general practitioner or other physician to initiate prophylaxis with first-line agents, but, if these are ineffective or cause adverse effects, referral to a neurologist is appropriate. Prophylactic agents should be trialled for at least a month at the highest tolerated dose before being deemed ineffective. Once good control has been achieved for at least 6 months, it may be possible to wean the patient off the drug. In more severely affected patients (eg, those with a longstanding history of very frequent attacks), a longer period of prophylactic therapy or combination prophylactic therapy may be needed.

Fact or fiction?

FACT: It is true that the risk of stroke is increased in patients who suffer migraine with aura.

FICTION: It is not true that disorders of the cervical spine are commonly a cause for migraine (although neck pain is very common).

Management of chronic migraine

In some patients with chronic migraine, the condition responds to treatment with topiramate11 or repeated injection of onabotulinumtoxinA into multiple sites in the head and neck.24 A multidisciplinary approach, including behavioural pain management, to chronic migraine and other refractory headaches (eg, in a dedicated headache clinic) is more likely to be successful than other approaches.25

Rachel returned 2 months later with her diary. Overall, she felt that there had been some improvement. According to her diary, she had had 17 headache days, more than she thought she was having before keeping the diary. Some of her less severe headaches resolved without treatment, which surprised her. She had had three daytime-onset migraine attacks with aura, two of which responded to diclofenac and domperidone. She had had two full-blown nocturnal-onset attacks, one of which occurred during her period; the attack during her period did not respond to ondansetron and indomethacin but the other did, and this was the first time she had ever been able to abort a full-blown attack. However, she had put on more weight despite taking only a low dose of amitriptyline.

Topiramate 25 mg at night was added to Rachel’s prophylactic therapy regimen, and she was given a schedule to gradually increase the dose. She was advised to use rizatriptan wafers for attacks that did not respond to initial treatment.

Rachel returned 3 months later and was pleased to show us her diary. She was taking topiramate (25 mg in the morning and 50 mg at night) and amitriptyline. She was experiencing pins and needles in her hands and feet but these were resolving and she had managed to lose weight (several kilograms). She had had only one nocturnal-onset attack, which responded to treatment, and no vomiting. She had had five daytime-onset attacks of migraine with aura, which had also responded to treatment, although she needed to use rizatriptan on two occasions. She had not missed any work days due to migraines, had started going out again and felt that she was finally “getting her life back on track”. Since she was responding to the topiramate without significant adverse effects, she was asked to increase it to 50 mg twice daily and to cease amitriptyline.

At her last review, Rachel was very happy with her situation. She had had no nocturnal-onset attacks and infrequent daytime-onset attacks with aura, which she reliably aborted. She had already started weaning herself off topiramate. It was agreed that she should come off topiramate as she no longer needed prophylaxis. She rang 6 months later to say that she remained essentially migraine-free.

1 SNOOP4 — headache red flags*1

  • Systemic symptoms (fever, weight loss) or secondary risk factors (HIV, cancer)

  • Neurological symptoms or abnormal signs (confusion, impaired alertness or consciousness)

  • Onset — sudden, abrupt or split second (“thunderclap”)

  • Older — new onset or progressive headache, especially in patients older than 50 years (giant cell arteritis)

  • Previous headache history — first headache or different headache (change in attack frequency, severity or clinical features)

  • Postural or positional aggravation

  • Precipitated by a Valsalva manoeuvre or exertion

  • Papilloedema


* Indicating that secondary causes should be considered.

2 Diagnostic criteria for migraine without aura

  • At least five attacks

  • Headaches last 4–72 hours

  • At least two of the following headache characteristics:

    • unilateral

    • pulsating

    • moderate to severe pain

    • aggravated by, or causes avoidance of, routine physical activity

  • At least one of the following during headaches:

    • nausea and/or vomiting

    • photophobia and phonophobia

3 Typical locations of primary and secondary headaches


The usual intensity of the headache in the various locations is denoted by the density of the shading. The discomfort in tension-type headache is usually described as a weight on the head or a tight band around the whole head. The pain of trigeminal neuralgia is lancinating and shock-like and is usually felt in the second or third divisions of the trigeminal nerve.

Reproduced with permission from James W Lance.

4 Diagnostic criteria for migraine with typical aura4

  • At least two attacks

  • One or more fully reversible aura symptoms indicating focal cortical and/or brainstem dysfunction, such as flickering lights or loss of vision, and unilateral pins and needles or numbness

  • No aura symptom lasts longer than 60 minutes

  • Headache follows aura with a headache-free interval of less than 60 minutes

5 Complicating issues and treatment options

Nausea and vomiting: use antiemetics; consider non-oral medications (rizatriptan wafers, sumatriptan nasal spray or injection, rectal diclofenac, rectal indomethacin, rectal prochlorperazine)

Frequent nocturnal onset: consider prophylaxis, even if frequency is not high; identify the presence of any warning the night before and consider pre-emptive treatment (ie, treatment given in the evening, such as an NSAID)

Frequent recurrence after initial relief of headache: consider an ergot preparation, naratriptan (as the incidence of recurrence is lower than for other triptans) or a triptan with a long-acting NSAID16

Severe perimenstrual attacks: consider perimenstrual pre-emptive treatment (eg, ergot preparation or NSAID therapy) (need diary) or prophylaxis, as menstrually related attacks are often severe and refractory to acute treatment16, 17

Elevated body mass index: avoid agents likely to cause increased appetite and weight gain (amitripyline, pizotifen, sodium valproate); consider topiramate (warn patient of, and monitor for, potentially serious adverse effects)

Concomitant SSRI or SNRI use: warn patient about, and monitor for, potential serotonergic adverse effects (eg, confusion, autonomic effects, tremor) if serotonergic antimigraine medication (ergot preparations, methysergide, triptans) is prescribed

Triptan failure: if ineffective, try another; if adverse effects, try naratriptan (which has the best side-effect profile of the triptans available in Australia)

Intolerance to, failure of, or reticence to use, pharmacological treatments: consider non-pharmacological approaches (eg, behavioural treatment and acupuncture)16,18,19

Medication overuse headache: identify and manage (see main text)

Comorbidities (eg, depression): identify and manage


NSAID = non-steroidal anti-inflammatory drug. SNRI = serotonin and noradrenaline reuptake inhibitor. SSRI = selective serotonin reuptake inhibitor.

6 Recommended drugs for the acute treatment of migraine

Drug

Dose

Specific considerations

PBS status*

Grade of evidence17,21

Common or serious adverse effects, interactions and warnings

Simple analgesics and NSAIDs


Aspirin

600–900 mg

No

A

Caution needed in patients with asthma and those with renal impairment

All can cause peptic ulceration and excessive bleeding

NSAIDs are not suitable for patients with a high cardiovascular risk profile or those who are pregnant

Diclofenac potassium

50–100 mg

Yes

A

Ibuprofen

200–400 mg

Yes

A

Naproxen sodium

550–825 mg

Yes

A

Indomethacin

100 mg

Suppository; useful if severe nausea or vomiting is present

No

B

Diclofenac sodium

50–100 mg

Suppository; useful if severe nausea or vomiting is present

No

B

Triptans

Eletriptan

40–80 mg

Lower incidence of recurrence; potent CYP3A4 inhibitor

Yes, AS

A

A class adverse effect of all triptans is the presence of atypical sensations over the chest, neck or throat, including heaviness, paraesthesias, pressure or tightness

Other adverse effects include dizziness, palpitations, somnolence and tingling

Contraindicated in patients with peripheral vascular, cerebrovascular and ischaemic heart disease, and in those with uncontrolled hypertension

Not to be used concurrently with ergot derivatives (including methysergide) or MAOIs (± 2 weeks)

Potential interactions with SSRIs, SNRIs and St John’s Wort

Naratriptan

2.5 mg

Best tolerated triptan of those available in Australia but slower to be effective; lower incidence of recurrence

Yes, AR, AX

A

Rizatriptan

10 mg

Wafer form; consider if nausea or vomiting are prominent or if patient is unable to take tablets; possible interaction with propranolol

Yes, AS

A

Sumatriptan

50 mg

Tablets

Yes, AS

A

10–20 mg

Nasal spray

Yes, AS

A

6 mg

Subcutaneous injection

Yes

A

Zolmitriptan

2.5–5 mg

CYP450 interaction

Yes, AR, AX

A


AR = authority required. AS = authority required (Streamlined Authority Code 3233). AX = authority required, indication(s) to waive special patient contribution. CYP3A4 = cytochrome P450 subtype. CYP450 = cytochrome P450. MAOI = monoamine oxidase inhibitor. NSAID = non-steroidal anti-inflammatory drug. PBS = Pharmaceutical Benefits Scheme. SNRI = serotonin and noradrenaline reuptake inhibitor. SSRI = selective serotonin reuptake inhibitor. * “Yes” means a PBS indication for migraine, “No” means no PBS indication for migraine. These apply to group as a whole, unless otherwise specified.

7 Drugs recommended for the prophylactic treatment of migraine*

Drug

Dose

Class of drug

TGA status

PBS status

Grade of evidence21,23

Common or serious adverse effects

First choice


Propranolol

40–120 mg twice daily

β-blocker

Yes

Yes

A

Hypotension, fatigue, insomnia

Amitriptyline

10–75 mg nightly

Tricyclic antidepressant

Yes

No

A

Sedation, dry mouth, weight gain

Pizotifen

0.5–3 mg nightly

Serotonin antagonist

Yes

Yes

B

Sedation, weight gain

Metoprolol

25–50 mg twice daily

β-blocker

Yes

Yes

B

Hypotension, bradycardia

Second choice

Sodium valproate

250–600 mg twice daily

Anticonvulsant

No

No

A

Weight gain, tremor, hair loss

Topiramate

25–100 mg twice daily

Anticonvulsant

Yes

Yes, AS

A

Paraesthesias, cognitive impairment, mood and personality changes, weight loss

Verapamil

160–320 mg daily

Calcium-channel blocker

No

No

B

Constipation, swollen ankles, flushing

Gabapentin

900–2400 mg daily

Anticonvulsant

No

No

C

Dizziness, sedation


AS = Authority required (Streamlined Authority Code 2799). PBS = Pharmaceutical Benefits Scheme. TGA = Therapeutic Goods Administration. * Third choice drugs are flunarizine, methysergide, lisinopril, cyproheptadine, candesartan, magnesium and riboflavin. “Yes” means TGA approved for migraine, “No” means not TGA approved for migraine. “Yes” means a PBS indication for migraine, “No” means no PBS indication for migraine.

Provenance: 

Commissioned; externally peer reviewed.

Received 
30 Nov 2011
accepted 
30 Jan 2012
Alessandro S Zagami, MB BS, MD, FRACP, Neurologist,1 and Conjoint Associate Professor2
Sian L Goddard, BSc, MB BS, Basic Physician Trainee1
1 Institute of Neurological Sciences, Prince of Wales Hospital, Sydney, NSW.
2 Prince of Wales Clinical School, University of New South Wales, Sydney, NSW.
Correspondence: 
Competing Interests: 
Alessandro Zagami receives financial support from the National Health and Medical Research Council and the Australian Brain Foundation.
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