Abrocitinib: what it treats, how to take it, side effects
Last updated September 6, 2026.
Abrocitinib, sold as Cibinqo, is a prescription tablet in the Janus kinase (JAK) inhibitor class, taken once a day for eczema that other treatments have not controlled. It blocks JAK1 signaling inside immune cells, which turns down the inflammatory messages that drive itching, redness, and repeated skin flares. Because it quiets part of your immune system, it carries a boxed warning for serious infections, blood clots, heart attack and stroke, and certain cancers. That is why you get tuberculosis screening and blood tests before you start and again while you take it.
What does it treat?
Abrocitinib is approved for moderate to severe atopic dermatitis (eczema) in adults and children 12 years and older whose disease is not well controlled by prescription creams and other systemic medicines, including injectable biologics, or when those medicines are not advisable. In practice that means widespread itchy, inflamed patches that keep coming back, skin that is thickened, cracked, oozing, or repeatedly infected, and itching bad enough to wake you at night or interfere with work and school. It is a single ingredient tablet, so there are no combination products, and it is often used after topical steroids, topical calcineurin inhibitors, or dupilumab have fallen short. It is not approved for psoriasis, rheumatoid arthritis, or ulcerative colitis, which are treated with other drugs in the same class.
How do you take it?
Abrocitinib comes as 50 mg, 100 mg, and 200 mg film coated tablets. The usual starting dose for adults and teens is 100 mg once daily; if your skin has not improved enough, your doctor can raise it to 200 mg once daily, and 200 mg a day is the ceiling for anyone. If you have moderate kidney impairment your maximum is 100 mg a day, and with severe kidney impairment it is 50 mg a day; the dose is also cut in half if you are a CYP2C19 poor metabolizer or take a strong CYP2C19 inhibitor such as fluconazole or fluvoxamine. Swallow the tablet whole with or without food, at about the same time each day, and do not crush, split, or chew it. If you miss a dose, take it when you remember unless your next dose is less than 12 hours away, in which case skip the missed dose and never take two tablets at once. Expect a blood count before you start, again around 4 weeks, and periodically after that, and stop the tablet and call your doctor if you develop fever, chills, a cough that will not quit, a painful blistering rash, unusual bruising, or leg swelling.
Side effects to know
- Common: The most common effects are cold symptoms and sore throat, nausea, headache, acne, dizziness, cold sores, and a temporary rise in the muscle enzyme CPK on blood tests, and nausea usually settles over the first few weeks.
- Serious: Stop the tablet and get medical help for signs of serious infection such as fever, chills, night sweats, or a spreading painful rash, for shingles or widespread herpes blisters on eczema skin, and for a swollen painful leg, sudden shortness of breath, chest pain, or one sided weakness, which can signal a clot, heart attack, or stroke. Severe stomach pain with fever and a change in bowel habits, unusual bruising or bleeding, or a new or changing skin lesion also need prompt evaluation.
Who should not take it?
Do not start abrocitinib while you have an active serious infection or untreated tuberculosis, and tell your doctor if you have had TB, hepatitis B or C, shingles, recurrent infections, cancer, a blood clot, heart attack, stroke, severe liver disease, or end stage kidney disease on dialysis, since the label advises against use in several of these situations. Risk of heart events and cancer runs higher if you are over 50 with a cardiovascular risk factor or you smoke now or used to. It should not be combined with other JAK inhibitors, biologic immunomodulators, or strong immunosuppressants such as azathioprine or cyclosporine, and you should avoid antiplatelet drugs other than aspirin 81 mg a day during the first 3 months. Strong CYP2C19 inhibitors such as fluvoxamine, fluoxetine, fluconazole, and ticlopidine call for a half dose, while strong inducers such as rifampin can make abrocitinib stop working, and live vaccines should be given before you start rather than during treatment. There is no adequate safety data in pregnancy, so tell your doctor if you are pregnant or planning to be and ask about the pregnancy exposure registry at 1-877-311-8972; the label advises not to breastfeed during treatment and for one day after the last dose. Alcohol has no listed interaction, but heavy drinking adds to infection risk and makes blood test changes harder to interpret, so keep intake light.
When is it an emergency?
Call 911 in the US for chest pain or pressure, sudden shortness of breath, coughing up blood, face droop, slurred speech or one sided weakness, fainting or collapse, or swelling of the face, lips, or tongue with trouble breathing. A hot, swollen, painful calf or thigh needs emergency evaluation the same day, as does severe stomach pain with fever and a change in bowel habits, a high fever with shaking chills, or a rapidly spreading blistering rash. If you or a child takes extra tablets, call Poison Control at 1-800-222-1222 right away, even if you feel fine, since there is no specific antidote and they will tell you what to watch for.
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Common questions
What is the maximum dose of abrocitinib I can take in a day?
The ceiling is 200 mg once daily, and most people start at 100 mg once daily. Your doctor moves you to 200 mg only if 100 mg has not cleared your skin enough. Lower ceilings apply in some situations: 100 mg a day with moderate kidney impairment, 50 mg a day with severe kidney impairment, and half the usual dose if you are a CYP2C19 poor metabolizer or take a strong CYP2C19 inhibitor. Never take two tablets in one day to catch up on a missed dose.
Can I drink alcohol while taking abrocitinib?
There is no listed interaction between abrocitinib and alcohol, so an occasional drink is not off limits for most people. Heavy or daily drinking is a different matter, because it weakens your defenses against the infections this drug already makes more likely, and it can push liver enzymes and blood counts around in ways that muddy your monitoring labs. If you drink regularly, tell your doctor before your next blood draw. Anyone with liver disease should talk it through first, since severe liver impairment is a reason not to take abrocitinib at all.
Is abrocitinib safe during pregnancy or breastfeeding?
There is not enough human data to know whether abrocitinib is safe in pregnancy, and animal studies showed harm at high doses, so it is generally avoided if you are pregnant or trying to conceive. Tell your doctor if you become pregnant on it, and ask about enrolling in the pregnancy exposure registry at 1-877-311-8972, which tracks outcomes to improve this guidance. The label advises not to breastfeed during treatment and for one day after your last dose, because it is unknown whether the drug passes into human milk. If you are planning a pregnancy, most clinicians switch you to a treatment with better pregnancy data before you conceive.
Do I need to take abrocitinib with food?
No. You can take it with food or on an empty stomach, whichever you will remember. Swallow the tablet whole with water and do not crush, split, or chew it. Taking it at roughly the same time each day keeps blood levels steady and makes missed doses less likely. If nausea bothers you in the first few weeks, taking the tablet with a meal often helps.
What happens if I take too much abrocitinib?
Call Poison Control at 1-800-222-1222 as soon as you realize it, even if you feel normal, because there is no specific antidote and they will advise on monitoring. An extra tablet raises the odds of nausea, headache, and dizziness in the short term, and the bigger concern with repeated overdosing is a drop in your white cells and platelets that shows up on blood tests rather than something you can feel. Call 911 instead if there is chest pain, trouble breathing, fainting, or collapse. Bring the bottle so the dose and strength are clear.
Which medicines interact with abrocitinib?
Strong CYP2C19 inhibitors such as fluvoxamine, fluoxetine, fluconazole, and ticlopidine raise abrocitinib levels and call for half the usual dose. Strong CYP2C19 and CYP2C9 inducers such as rifampin can drop levels enough that the drug stops working, so that combination is avoided. Do not combine abrocitinib with other JAK inhibitors, biologic immunomodulators, or potent immunosuppressants like azathioprine or cyclosporine, and avoid antiplatelet drugs other than aspirin 81 mg a day during the first 3 months. Live vaccines should be given before you start, and abrocitinib can also raise levels of some drugs cleared by P-glycoprotein, such as dabigatran and digoxin, so bring your full medicine list to every visit.