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 the CGRP receptor. Results may take 1 to 3 months.
What it's used for
- Preventing migraines in adults
How to take it
- Inject under the skin once a month.
- Let it warm to room temperature for 30 minutes first.
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
- Constipation
- Injection site reactions
- Muscle cramps
Call your provider todaySevere constipation
Call your provider todayNew or worse high blood pressure
Call 911Swelling of the face, lips, or throat, hives, or trouble breathing
Warnings
- The needle cap contains latex in some versions.
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
Take it as soon as you remember, then schedule 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. It can be kept at room temperature for up to 7 days.
Conditions it's used for
Sources
- DailyMed: FDA drug label for Erenumab (U.S. National Library of Medicine)
- MedlinePlus: Drugs, herbs, and supplements
- FDA: Drugs@FDA
Last updated 2026-11-13.