Emgality (galcanezumab-gnlm) is used to prevent migraine headaches. Emgality is a CGRP receptor antagonist, which works by blocking a protein that is released during migraine attacks. The most common form of Emgality is a 125mg pen. It is also available as a syringe. There are currently no generic alternatives for Emgality. It is covered by most Medicare and insurance plans, but manufacturer and pharmacy coupons can help offset the cost. With the Patient Assistance Program from Lilly, you can receive your medication at no cost.