Spevigo (spesolimab)

What it is

Spevigo (spesolimab) is the first treatment made specifically for generalized pustular psoriasis (GPP) — a rare and serious form of psoriasis in which widespread pus-filled blisters (pustules) appear on red, painful skin, often with fever and feeling very unwell. It blocks the IL-36 pathway, a signal that drives this particular type of skin inflammation. It is used in two ways: as an infusion to calm an active flare, and as a regular injection to help prevent future flares in people aged 12 and older.

Before starting

Before treatment, we screen for tuberculosis (TB) and other infections. Medicines that calm the immune system can allow a hidden infection to become active, and a GPP flare can look like — and occur alongside — skin infection, so your team will check your skin and overall condition carefully before each dose. Treatment is not given during an active serious infection. Tell us about all other psoriasis treatments you use, and about any drug allergies. Because GPP flares can escalate quickly, part of the plan is knowing exactly how to reach us fast when a flare starts — you will have our number and instructions before you ever need them.

How it’s given

During a flare, it is given as a single IV infusion — medicine dripped slowly into a vein — in our clinic over about 90 minutes; a second dose may be given a week later if the flare has not settled. For prevention, a form injected under the skin is used: a larger first dose given as two injections, then a regular dose once a month, which can be self-injected at home after training. Our team will show you the technique and check your first home dose with you if needed.

What to expect

Spevigo can work quickly on a flare: pustules often begin clearing within days of the infusion, and many patients see major improvement within a week. The most common side effects are tiredness, nausea, headache, itching, and redness or bruising at injection sites; urinary and skin infections can also occur. Allergic reactions during the infusion are uncommon — the team monitors you throughout. Call us the same day if blisters spread, fever develops, or you feel markedly unwell: with GPP, early treatment of a flare is far easier than late treatment.

Everyday guidance

If you are on the monthly preventive injections, keep them on schedule even when your skin has been clear for months — their job is to stop the next flare before it starts. Keep a simple flare diary: photos of your skin and notes on fever or triggers help us judge severity quickly when you call. Do not stop other medicines your provider has prescribed for GPP without discussing it first. If you miss a preventive dose, take it as soon as you remember, then continue monthly. For any sign of a flare, call (361) 400-7700 right away.