Anifrolumab (Saphnelo): What You Need to Know

What is anifrolumab?

Anifrolumab (brand name Saphnelo) is a biologic medication used to treat moderate to severe systemic lupus erythematosus (SLE) in adults who are already on standard lupus therapy. It is added to your existing treatment, not a replacement for it.

Anifrolumab works differently from other lupus drugs — it is a type I interferon receptor blocker. Type I interferons are immune signaling proteins that run high in most people with lupus and help drive the disease. Anifrolumab plugs the receptor these interferons act through (called IFNAR1), turning down an overactive pathway at a key control point.

How to take it

Anifrolumab comes in two forms, and both deliver the same medication.

Intravenous infusion (in-office):

• 300 mg given as a 30-minute IV infusion at our on-site infusion center.
• Repeated every 4 weeks.
• Given by our nursing staff — you can read, work, or relax during the session.

Subcutaneous injection (at home) — new option:

• 120 mg once weekly using a prefilled autoinjector pen (the Saphnelo Pen) or a prefilled syringe.
• Self-administered at home after training in our office.
• Store in the refrigerator — remove and let it reach room temperature for about 60 minutes before injecting. Do not warm it any other way and do not shake it.
• Rotate injection sites between the thigh and abdomen (at least 2 inches from the navel).

The at-home injection was FDA-approved in April 2026 and gives patients a way to stay on anifrolumab without a monthly infusion visit. Your rheumatologist will help you choose the route that fits your life, insurance, and preference.

What to expect when starting

Anifrolumab works gradually. Many patients begin to see improvement — in skin rashes, joint pain, and overall disease activity — over the first couple of months, with fuller benefit building over the following months. It is not a quick fix for a sudden flare.

Keep taking your other lupus medications as prescribed while anifrolumab takes effect. Over time, controlling your lupus may let us lower your steroid dose.

Lab monitoring

• Baseline blood work before starting — CBC, metabolic panel, and infection screening.
• Periodic blood work while on therapy to monitor your blood counts and overall health.
• Anifrolumab does not require the frequent specialized lab checks that some other biologics do, but we still monitor you regularly.

Side effects to watch for

Common:

• Cold symptoms and respiratory infections — nasopharyngitis, sinus congestion, bronchitis, and cough are the most common.
• Infusion reactions (IV form) or injection site reactions (SC form) — usually mild.

Important — contact us if you experience:

• A painful, blistering rash on one side of the body — this can be shingles (herpes zoster), which is more common on anifrolumab. Early antiviral treatment works best, so call us promptly.
• Fever, chills, or any signs of infection — persistent cough, burning with urination, or a wound that isn’t healing.
• Signs of an allergic reaction — hives, swelling of the face or throat, wheezing, or trouble breathing during or after a dose.

Important: Anifrolumab raises your risk of shingles. Watch for a painful, tingling, or blistering rash — usually in a band on one side of the body — and contact us right away if it appears. Getting the Shingrix vaccine before starting greatly reduces this risk.

Required screening before starting

As with any medication that affects the immune system, before your first dose we will:

• Screen for tuberculosis and hepatitis — standard safety checks before starting a biologic.
• Check baseline blood work — CBC and metabolic panel.
• Review your vaccination history — we strongly recommend completing the Shingrix (shingles) vaccine series before starting, because anifrolumab increases shingles risk. Shingrix is not a live vaccine, so it’s safe to give.

Things to avoid

• Live vaccines — avoid live vaccines while on anifrolumab. Inactivated vaccines (flu shot, COVID, Shingrix) are safe and recommended.
• Other biologics — anifrolumab should not be combined with another biologic. Doing so raises infection risk without added benefit.
• Don’t ignore infections — if you develop signs of infection, especially a possible shingles rash, contact us early rather than waiting.

IV infusion vs. at-home injection

Both forms are equally effective — the choice is about what fits your life:

• IV infusion — every 4 weeks at our on-site infusion center, no self-injection needed. A good option if you prefer supervised care.
• At-home injection — weekly, on your own schedule, no office visit needed for each dose. The newer option, and most patients find the pen easy after initial training.

You can switch between forms over time if your needs change.

Frequently asked questions

How is anifrolumab different from belimumab (Benlysta)? Both treat lupus, but they target different pathways. Belimumab lowers the survival of B cells (the immune cells that make lupus autoantibodies). Anifrolumab blocks the type I interferon signal that drives lupus in most patients. Your rheumatologist chooses based on your specific disease pattern — for example, anifrolumab often works well for lupus skin disease.

Is anifrolumab used for lupus kidney disease (lupus nephritis)? No. Anifrolumab is approved for moderate-to-severe SLE, but it has not been established for severe active lupus nephritis or lupus affecting the brain and nervous system. For kidney lupus, we use other therapies — belimumab is one option approved for that.

Should I get the shingles vaccine first? Yes, we strongly recommend it. Because anifrolumab raises your shingles risk, completing the Shingrix series before starting is one of the most important things you can do to stay safe. Shingrix is not a live vaccine, so there’s no conflict with the medication.

What if I miss a dose? For at-home injections: take it as soon as you remember, then resume your weekly schedule. For IV infusions: call us to reschedule as soon as possible, ideally within a week of your scheduled date.

Can I take anifrolumab during pregnancy? There is not yet enough data to know it’s safe in pregnancy, so this is an individual decision. Tell us early if you’re pregnant or planning to be. A pregnancy registry exists, and we can help you enroll.

This handout is provided for educational purposes and does not replace individualized medical advice. Always follow the specific instructions given by your rheumatologist.