Nausea and vomiting are common symptoms of migraine. These symptoms can significantly affect quality of life, increase disability, and complicate treatment, as they often make it difficult for individuals to take or absorb oral medications.
These challenges can often be addressed with the right treatment strategies and medication choices. Knowing your options before speaking to a doctor or pharmacist can help you feel more prepared.
This article will help you better understand anti-nausea medications (also called antiemetics) as one of your acute treatment options.
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Understanding nausea and vomiting in migraine (1,2)
Neurological connection: Nausea and vomiting are so common in migraine that they help doctors diagnose the condition, as it can help differentiate migraine from a tension-type headache. Nausea may occur in migraine for several reasons including activation of nausea centres in the brain, altered autonomic function in the gut-brain axis and gastric stasis as well as migraine-related activation of vestibular areas in vestibular migraine.
Gastroparesis (delayed stomach emptying) often occurs during migraine episodes. When the stomach stops contracting, it can cause nausea and sometimes vomiting, and also impair drug absorption. This delayed gastric emptying not only causes discomfort but can also impair the absorption of oral medications, reducing their effectiveness.
Additional Gastrointestinal symptoms: In addition to nausea and vomiting, people with migraine may often report experiencing other gastrointestinal symptoms during episodes, such as diarrhea, loss of appetite, and early satiety (feeling full quickly). These symptoms highlight the broad impact of migraine on the body.
Abdominal migraine and cyclic vomiting syndrome: Abdominal migraine is a possible migraine variant seen mainly in children. It is associated with recurrent episodic attacks of abdominal pain or discomfort, nausea and/or vomiting, that can last 2-72 hours with complete normality between episodes. Headache does not occur during these episodes, and it is important to consider other conditions. Consideration needs to be made of other disorders.
Gut-brain axis: There is an intricate relationship between the brain and the gut in migraine. It is a complex system, which is, mediated in part by the vagus nerve and involving key neurochemicals like serotonin, glutamate, and CGRP, all of which are present in both the brain and gut. These chemicals play roles in both migraine and gut function, helping explain why gastrointestinal symptoms like nausea are so tightly linked to migraine.
Chronic migraine marker: Persistent, frequent, nausea can be a marker of more severe migraine and is also a predictor of chronification, although it is one of several risk factors and should be considered in the broader context of migraine symptom patterns and frequency. Managing these symptoms directly, including with antiemetics when appropriate, is key to improving both comfort and treatment outcomes. (3)
Drug absorption and treatment: For some people, oral analgesics or triptans are hard to use because the nausea is worsened by trying to swallow a tablet with fluids. Nausea and vomiting not only increase the burden of each episode but can also interfere with the use and absorption of oral medications, making effective treatment more challenging.
What are anti-nausea medications?
Anti-nausea medications are used to provide relief from nausea and vomiting in a series of conditions and diseases. There are different types of antiemetics: dopamine antagonists (block dopamine), serotonin antagonists (block serotonin) and antihistamines (block histamine) which all work differently in the body.
In migraine, antiemetics not only control nausea and vomiting but can also enhance the absorption and efficacy of other oral migraine medications. (4)
Combining antiemetics (such as metoclopramide, domperidone, or prochlorperazine) with acute migraine treatments is widely recommended as best practice in clinical guidelines for people whose episodes include nausea, vomiting, or poor response to oral medications. (5) This approach can improve comfort, reduce symptoms, and make migraine therapies more effective. Some antiemetics, like metoclopramide, have a mild anti-migraine effect themselves and can help speed up gastric emptying, aiding the absorption of oral medications. (4, 5)
In emergency departments, intravenous (IV) antiemetics that block dopamine—such as metoclopramide—are often used to treat migraine episodes that haven’t responded to other treatments. (6)
Always discuss with your healthcare provider to determine the best combination and dosing for your individual needs based on your symptoms and reaction to previous medications.
Who might benefit from anti-nausea medications?
Not every person with migraine will need an antiemetic. Anti-nausea medications may be beneficial in the following instances:
- for episodes with prominent gastrointestinal symptoms
- when previous attempts at oral medication have been ineffective, either due to vomiting, delayed gastric emptying, or sometimes to improve the effectiveness of the acute medication itself (e.g. in the emergency department).
- People with particular migraine types such as vestibular migraine or abdominal migraine. (2, 7, 8)
- To improve the effectiveness of acute medications where you have limited options; such as in pregnancy, or in older adults with vascular disease that prevents the use of triptans. (5, 6)
In all these cases, it is important to discuss your acute treatment plan with your doctor and considering whether alternate options are appropriate. Some options include analgesics or triptans in a dissolvable wafer, as a spray, subcutaneous injections, suppositories, or intravenously, or using neuromodulation devices that bypass the gut. Also natural alternatives like ginger or essential oils can be considered if appropriate. (6, 9)
Types of anti-nausea medications
The most common anti-nausea medications used in migraine are dopamine antagonists such as metoclopramide, prochlorperazine and domperidone. Prochlorperazine can also help with symptoms such as vertigo and dizziness which are features of vestibular migraine.
Other types of anti-nausea medications may also be prescribed to help alleviate symptoms such as antihistamines (promethazine) or serotonin antagonists (ondansentron).
How anti-nausea medications work
Antiemetics work by blocking the signals in the brain and gut that trigger the vomiting reflex. Different antiemetics act on different pathways depending on the cause of nausea. Here’s how some of the main types work:
- Dopamine antagonists (e.g. metoclopramide, prochlorperazine) block dopamine receptors in a part of the brain called the chemoreceptor trigger zone (CTZ), which detects nausea-inducing chemicals in the blood.
- Serotonin antagonists (e.g. ondansetron) block serotonin (5-HT3) receptors, especially in the gut and brainstem. Commonly used for nausea caused by chemotherapy, radiation, or surgery.
- Antihistamines (e.g. promethazine, diphenhydramine) block histamine (H1) receptors, which play a role in motion sickness and vertigo. Often used for vestibular causes of nausea (e.g. inner ear issues).
*The dose of medications and maximum daily dose vary with your health conditions and age. Dosages apply to adults over 18. Take these medications only as directed by your doctor or pharmacist, and follow their prescribed information.
None of the above medications were developed specifically for migraine.
