The U.S. Food and Drug Administration approved Siliq (brodalumab) to treat adults with moderate-to-severe plaque psoriasis. Siliq is administered as an injection.

Siliq is intended for patients who are candidates for systemic therapy (treatment using substances that travel through the bloodstream, after being taken by mouth or injected) or phototherapy (ultraviolet light treatment) and have failed to respond, or have stopped responding to other systemic therapies. 

Suicidal ideation and behavior, including completed suicides, have occurred in patients treated with Siliq during clinical trials. Siliq users with a history of suicidality or depression had an increased incidence of suicidal ideation and behavior compared to users without this history. A causal association between treatment with Siliq and increased risk of suicidal ideation and behavior has not been established.

Because of the observed risk of suicidal ideation and behavior, the labeling for Siliq includes a Boxed Warning and the drug is only available through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the Siliq REMS Program. Notable requirements of the Siliq REMS Program include the following:

• Prescribers must be certified with the program and counsel patients about this risk. Patients with new or worsening symptoms of depression or suicidality should be referred to a mental health professional, as appropriate.
• Patients must sign a Patient-Prescriber Agreement Form and be made aware of the need to seek medical attention should they experience new or worsening suicidal thoughts or behavior, feelings of depression, anxiety or other mood changes.
• Pharmacies must be certified with the program and must only dispense to patients who are authorized to receive Siliq.

Siliq is also approved with a Medication Guide to inform patients of the risk of suicidal ideation and behavior, and that because Siliq is a medication that affects the immune system, patients may have a greater risk of getting an infection, or an allergic or autoimmune condition. Patients with Crohn’s disease should not use Siliq.

Health care providers should also evaluate patients for tuberculosis (TB) infection prior to initiating treatment with Siliq. Health care providers should not administer Siliq to patients with active TB infection, and should avoid immunizations with live vaccines in patients being treated with Siliq.

The most common adverse reactions reported with the use of Siliq include joint pain (arthralgia), headache, fatigue, diarrhea, throat pain (oropharyngeal pain), nausea, muscle pain (myalgia), injection site reactions, influenza, low white blood cell count (neutropenia) and fungal (tinea) infections.

(Source: U.S. Food & Drug Administration)