Cgrp Inhibitors

Overview

CGRP inhibitors are a newer group of prescription medicines used to help with migraine. CGRP stands for 'calcitonin gene-related peptide' — say it 'kal-si-TOE-nin': it is a small protein your body makes that plays a big part in migraine attacks. Levels of CGRP rise during a migraine, and it widens blood vessels in the head and helps carry pain signals. CGRP inhibitors are medicines that block CGRP or block the place where it attaches in the body. By doing that, they can make migraine attacks happen less often and feel less severe. There are two broad ways they are used: some are taken regularly to prevent attacks, and some are taken to stop an attack that has started. Which type you might be offered depends on your situation, and a doctor or headache specialist decides this with you.

Migraine itself is very common — it affects around 1 in 7 adults worldwide. CGRP inhibitors are much newer, so fewer people use them than older migraine medicines. They have become more widely used in recent years, mainly for people whose migraines are frequent or disabling and who have not got on well with other treatments.

CGRP inhibitors are usually considered for adults who have migraine with frequent or disabling attacks — for example, several migraine days a month — and who have already tried other preventive treatments without enough benefit, or could not tolerate them. They are not generally used in children or teenagers, as there is much less evidence for that age group. In older adults, extra care is taken because other health conditions and other medicines are more common.

Symptoms

Common symptoms

• The symptoms CGRP inhibitors are used to reduce are migraine symptoms, which commonly include a throbbing headache, often on one side of the head.
• Feeling sick (nausea) or being sick, and finding light, sound or smells uncomfortable.
• Attacks that last from a few hours up to a few days and get in the way of work, study or family life.
• For some people, warning signs before the headache (called aura), such as flashing lights, zigzag lines, or tingling in the face or hand.
• Feeling washed out or 'hungover' for a day or so after an attack.

Symptoms in children

• Children with migraine often have shorter attacks and may complain of tummy pain or sickness more than headache.
• They may become quiet, pale, or want to lie in a dark room.
• CGRP inhibitors are not usually prescribed for children; treatment for children is discussed with a children's doctor or headache specialist.

Symptoms in older adults

• Migraine can change with age, and new headaches in later life always need checking, because they can have other causes.
• Older adults are more likely to take other medicines, so possible interactions need reviewing.
• Other health conditions, such as high blood pressure or heart problems, are checked before any new migraine medicine is started.

Causes

Main causes

• Migraine is a brain-based condition, largely run in families, in which the brain is more sensitive to certain triggers.
• During an attack, the body releases CGRP and other chemicals that carry pain signals and cause changes in blood vessels in the head. CGRP inhibitors work by blocking this step.
• Hormonal changes, such as around periods or the menopause, can affect migraine patterns.
• Lack of sleep, skipped meals, dehydration, stress and some foods or drinks can set off attacks in some people.
• Taking painkillers very often can actually make headaches more frequent — this is called medication overuse headache.

Risk factors

• A family history of migraine.
• Being female, especially during the reproductive years.
• A history of very frequent headaches or long-standing migraine.
• High stress, poor sleep, or irregular meals and hydration.
• Using over-the-counter painkillers on many days of the month.

When to see a doctor

See a doctor urgently if:

• Any of the emergency symptoms listed above — call your local emergency number straight away.
• A new headache pattern, or headaches that are getting steadily worse over days or weeks.
• Severe constipation, very high blood pressure, or a reaction to a medicine.
• If you are pregnant, planning a pregnancy, or breastfeeding and are considering or using this treatment.

Book a routine appointment if:

• Your migraines are frequent or disabling enough to affect work, study, sleep or mood.
• You have tried a few preventive treatments without enough benefit.
• You want to review whether a CGRP inhibitor is suitable for you, or whether an existing one is working.
• You are keeping a headache diary and want help making sense of it.

Diagnosis

Migraine is usually diagnosed from your history rather than from a scan. A doctor will ask about the pattern, length and severity of your headaches, whether you get warning signs, whether you feel sick or are sensitive to light, and how attacks affect your life. They will also ask about other medicines and your general health. There is no blood test that tells you whether a CGRP inhibitor will work for you. Instead, your doctor or a headache specialist decides whether this group of medicines is suitable based on your diagnosis, how often you have attacks, what you have already tried, and your other health conditions.

Tests that may be done

• A headache diary you keep for a few weeks — this is often the most useful 'test' of all.
• A physical and neurological examination, including checking your eyes and blood pressure.
• A review of medicines you already take, including painkillers bought over the counter.
• Blood tests or a scan may be arranged if your history suggests another cause, but most people with migraine do not need a brain scan.
• Occasional blood pressure checks, which may be repeated after starting treatment.

What to expect at your appointment

You may be seen in general practice first and then referred to a headache clinic or neurologist. The appointment is a conversation: expect questions rather than tests. If a CGRP inhibitor is started, you will usually be asked to keep tracking your headache days so you and your clinician can see after a few months whether it is helping. If it is not helping enough, the plan can be reviewed and changed.

Treatment

CGRP inhibitors are one part of migraine care, not the whole of it. Some are given on a regular schedule to reduce how often attacks happen; others are taken when an attack begins to try to stop it. How they are given varies — some are injections under the skin that you or a family member can be taught to give, one type is given into a vein by a healthcare professional, and some are tablets. Your clinician will explain the options available where you live, what the schedule involves, and what to expect. Treatment is usually reviewed after a few months to see whether it is worth continuing.

Self-care at home

• Keep a simple headache diary — date, severity, possible triggers, and what you took. It helps you and your clinician see patterns.
• Keep regular sleep and wake times, including at weekends.
• Eat regularly, drink enough water, and avoid long gaps without food.
• Notice and limit your own triggers where you can, without letting migraine rule your life.
• Be careful with over-the-counter painkillers — using them on many days a month can make headaches worse. Ask your pharmacist or doctor for advice.
• Tell any doctor, nurse, dentist or pharmacist that you use a CGRP inhibitor, for example before surgery or if a new medicine is suggested.
• Ask your pharmacist to check any new medicine, including herbal remedies, for interactions.

Medical treatments

Migraine care is usually built in layers. Acute treatments are taken at the start of an attack to relieve pain and sickness. Preventive treatments are taken regularly to reduce how often attacks happen; these include several different classes of medicine that were originally developed for other conditions, as well as treatments aimed specifically at the CGRP pathway. Some people also benefit from treatments such as nerve blocks, relaxation-based therapies, or a structured psychological approach such as cognitive behavioural therapy for pain. Which options are right for you depends on your health, other medicines, how often you have attacks, and your preferences — this is a shared decision with your clinician. Never start, stop or change a prescription medicine without talking to your doctor or pharmacist first.

When is surgery considered?

Surgery is not a standard treatment for migraine. Very rarely, specialist teams consider procedures for specific, unusual headache conditions. For almost everyone, treatment is with medicines, lifestyle adjustments and supportive therapies.

Living with this condition

Living with migraine means planning a little without letting migraine take over. Many people find it helps to keep a routine around sleep, meals and hydration, to have a treatment plan ready for when an attack starts, and to tell the people around them — at work or at home — what helps when an attack hits. If you use a CGRP inhibitor, build it into your routine, for example on the same day each week or month, whichever schedule your clinician has agreed with you. Keep a note of any side effects and share them at your reviews.

Lifestyle tips

• Keep a consistent sleep schedule and aim for enough sleep.
• Stay physically active in a way you enjoy — gentle regular activity suits many people with migraine.
• Notice stress and build in small breaks; paced breathing or relaxation exercises help some people.
• Limit alcohol and caffeine if you notice they trigger attacks for you.
• Keep a diary so you can spot patterns rather than guessing.
• Tell your employer or school about your condition if it affects you, so reasonable adjustments can be discussed.

Diet and exercise

There is no single migraine diet, and strict elimination diets are usually not helpful unless you have clearly identified triggers. The most useful approach is to eat at regular times, drink enough water, and note in your diary whether specific things — such as skipping meals, alcohol, or too much caffeine — seem to set off attacks. Regular, moderate exercise can reduce how often migraines happen for some people. Start gently if you are not used to exercise, and ask your doctor or a physiotherapist for advice if you are unsure what is safe for you.

Mental health and emotional wellbeing

Migraine and mental health are closely linked: living with frequent pain can cause worry, low mood and frustration, and stress and low mood can in turn make attacks more likely. This is very common and nothing to feel ashamed of. Tell your doctor how you are feeling — support such as talking therapies is available and can help with both mood and pain coping. If you ever feel hopeless, or have thoughts of harming yourself, please reach out for help straight away: contact your local emergency number, your doctor, or a crisis line in your country. You do not have to cope alone.

Prevention

Migraine cannot be 'cured' or fully prevented, but the frequency and severity of attacks can often be reduced. CGRP inhibitors are one of the preventive options — they aim to lower the number of migraine days rather than stop migraine altogether. Regular routines around sleep, meals, hydration and stress management, plus avoiding overuse of painkillers, are the everyday things that most reliably help.

Screening programmes

There is no screening test for migraine. The nearest thing is to track your headaches with a diary so that patterns and worsening are picked up early, and to have your blood pressure checked from time to time as your clinician advises.

Complications

If left untreated

• Frequent migraine can become more frequent over time, and painkiller overuse can make headaches worse.
• Ongoing attacks can affect work, study, relationships and sleep.
• Living with frequent pain raises the risk of anxiety and low mood.
• Some people develop chronic migraine, meaning headaches on many days of the month — this is easier to manage if it is addressed early.
• Rarely, a headache can be a sign of something more serious, which is why new or changing headache patterns should always be checked.

Long-term outlook

The outlook for people with migraine has improved a lot in recent years. There are more treatment options than ever, including this newer group of medicines, and many people find a combination that genuinely reduces their attacks. It can take a few tries to find what works for you, and that is normal rather than a failure. Keep talking to your healthcare team, keep your diary going, and give each treatment a fair review period before deciding together whether to continue.

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