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I heard that there is an injection for migraines called Aimovig. What exactly is it?

Aimovig, also known as erenumab, is an injection used for the prevention of migraines that occur at least 4 days a month. It is typically considered as an option for patients who have tried multiple oral treatments without adequate relief. This medication is administered as a once-a-month dose. It was approved by Health Canada in August 2018 and there is limited data on its effectiveness and safety in specific populations such as children, pregnant women, and individuals over the age of 65. Reported side effects include pain and redness at the injection site, constipation, itching, and muscle spasms.