ImportantThis page is general information, not a prescription. Don't start, stop, or change a medicine without talking to your provider or pharmacist.
Overview
It blocks CGRP, a protein involved in migraine attacks.
What it's used for
- Preventing migraines
- Episodic cluster headaches
How to take it
- Inject under the skin once a month after a loading dose.
Your dose depends on your health and other medicines. Always follow your prescription label, and ask your pharmacist if anything is unclear.
Side effects
Common side effects
- Injection site reactions
Call 911Swelling of the face, lips, or throat, hives, or trouble breathing
Call your provider todayNew or worse high blood pressure
Warnings
- Allergic reactions can happen days after a dose.
Other medicines, foods, and alcohol
- Few interactions.
Tell your provider and pharmacist about every medicine, vitamin, and supplement you take.
Pregnancy and breastfeeding
Talk with your provider.
Missed doses, overdose, and storage
If you miss a dose
Inject as soon as you remember, then monthly from that date.
If someone takes too much
Call Poison Control at 1-800-222-1222 or get help online at poison.org. Call 911 if the person collapses, has a seizure, has trouble breathing, or can't be woken.
Storing it
Keep in the refrigerator; can stay at room temperature for up to 7 days.
Conditions it's used for
Sources
- DailyMed: FDA drug label for Galcanezumab (U.S. National Library of Medicine)
- MedlinePlus: Drugs, herbs, and supplements
- FDA: Drugs@FDA
Last updated 2026-11-13.