Degarelix (Firmagon) is an LHRH antagonist. It works like the LHRH agonists, but it lowers testosterone levels more quickly and doesn’t cause tumor flare like the LHRH agonists do. Treatment with this drug can also be considered a form of medical castration.
This drug is used to treat advanced prostate cancer. It is given as a monthly injection under the skin. The most common side effects are problems at the injection site (pain, redness, and swelling) and increased levels of liver enzymes on lab tests. Other side effects are discussed in detail below.