Flublok (generic: influenza vaccine) is a prescription medication used to protect people from the influenza virus, also known as "the flu."

Flublok belongs to a group of drugs called vaccines, that work by strengthening the immune system to better protect itself.

This medication comes in injectable form, that is administered by a doctor, nurse or pharmacist. 

Some common side effects are: fatigue, muscle ache, and pain at the injection site.