What should you know about filgotinib for psoriatic arthritis?

Psoriatic arthritis can cause joint pain, swelling, stiffness, and inflammation around tendons or the spine. Filgotinib works by affecting Janus kinase signalling, which helps regulate immune activity. The aim is to reduce active inflammation and protect movement over time, rather than simply masking discomfort. It is not suitable for everyone, so your clinician considers other illnesses, medicines, infection history, and pregnancy plans before recommending it.

Treatment response is assessed through symptoms, examination, and sometimes blood tests. Improvement may take time, and the plan can be adjusted if inflammation remains active or side effects appear.

Discuss why filgotinib is being considered, how it will be taken, and which checks are needed before and during treatment. Tell the prescribing team about fever, repeated infections, liver or kidney problems, blood disorders, clotting history, and every prescription or supplement you use. Do not start, stop, or share this medicine without medical advice.

Keep a simple record of swollen joints, morning stiffness, skin symptoms, and any new illness. Gentle, planned activity and [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) may support strength and function alongside medical treatment. [Anti-Inflammatory Medication](/treatments/non-surgical-orthopedics/anti-inflammatory-medication/) is a separate treatment discussion, not an automatic addition.

Contact your care team promptly for a persistent fever, worsening cough, painful urination, unusual bruising, marked fatigue, or a new rash. Seek urgent help for sudden chest pain, breathlessness, one-sided leg swelling, severe weakness, or symptoms suggesting a serious infection. A rapidly hot and swollen joint with fever also needs urgent assessment.

Ask: Why is filgotinib appropriate for my pattern of psoriatic arthritis? What tests should I complete before starting? Which symptoms should make me pause a dose or call? How will we judge whether the treatment is helping? Which vaccines, medicines, or activities need special planning?