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Adalimumab is the biologic I have prescribed longest, and close to two decades of safety data is part of why. It is often my first choice when psoriasis comes with sore, swollen joints or with hidradenitis suppurativa, because one drug covers both. Patients ask about the needle and the infection risk — the pen is easier than people expect, and we screen for tuberculosis before anyone starts. The big change is biosimilars, and your plan usually picks which one you get, so a switch is not a downgrade even if the pen feels different.
— Dr. Schwarz, Board Certified Dermatologist
Key Facts
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| Also called | Humira, and biosimilar versions sold as Amjevita, Cyltezo, Hyrimoz, Hadlima, Yuflyma, Idacio, Abrilada, Yusimry and Simlandi |
| Drug class | TNF inhibitor. A biologic, meaning a protein grown in living cells rather than made by chemistry |
| Taken as | Injection under the skin, from a pen or a prefilled syringe you use at home |
| Typical course | Long term, for as long as it keeps working and is tolerated |
| Time to work | Some change by 4 weeks, judged at about 16 weeks |
| Prescription only | Yes |
What It Is
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Adalimumab is a biologic — a large protein grown in living cells rather than a chemical made in a factory. Stomach acid would destroy it, so it has to be injected. It is a lab-made antibody, built to lock onto a single inflammation signal called TNF and pull it out of circulation. In use since the early 2000s, it was approved for moderate to severe plaque psoriasis in 2008. It also treats psoriatic arthritis, hidradenitis suppurativa, rheumatoid arthritis, Crohn's disease, ulcerative colitis and some eye inflammation. Several biosimilars have been sold in the United States since 2023.
How It Works
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TNF, short for tumor necrosis factor, is a messenger protein immune cells release to start and sustain inflammation. In psoriasis there is too much of it in the skin, which produces redness, swelling, and skin cells that multiply far faster than they should — a thick scaly plaque. Adalimumab binds TNF so the message never lands.
Because TNF is a general inflammation signal, one injection calms psoriasis in the skin and inflammation in the joints at the same time.
The trade-off comes from the same fact. TNF also helps your body wall off infections, particularly tuberculosis, and blocking it can wake a dormant TB infection. That is why everyone is tested for TB before the first dose.
Here is where Adalimumab (Humira) acts in the skin, and what the others do instead.
About Adalimumab (Humira)
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Skin basics
Adalimumab (Humira) works on the immune signal throughout the body, not just where the rash is. That is what makes it powerful in widespread disease, and why it needs monitoring. Blocks TNF-alpha, an older and broader target than the newer psoriasis biologics. It treats the joints as well as the skin.
Adalimumab (Humira) arrives from the inside, carried to the skin by the blood, rather than crossing the barrier from outside. That is why it works everywhere at once, and why it needs monitoring.
In a plaque, skin cells travel from the bottom of the epidermis to the surface in four to six days instead of a month, and pile up as scale. This slows them back down, so the plaque thins.
The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.
The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.
The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.
What It Treats
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Not the Best For
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Forms
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It comes as a single-use pen, an autoinjector you press against the skin, and as a prefilled syringe you push yourself. Same drug inside. Most people find the pen easier; some prefer the syringe for the slower push.
Newer citrate-free formulations sting noticeably less, and most products sold now are citrate-free. Biosimilars come in the same pen and syringe forms, but device design, needle gauge and cap differ between brands, so ask for a fresh demonstration if your pharmacy switches you.
Store it in the fridge; most versions can also sit at room temperature for a limited period printed on the carton. Never freeze it or leave it in a hot car.
It is stored in the fridge:
Strengths
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The strength is fixed by the pen or syringe, so a dose is built from whole injections rather than fine-tuned. Not every brand makes every strength.
Dose
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How to Take It
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When to take it: Any time of day, but pick a set day of the week and keep to it. Every other week is easy to lose track of, so set a phone reminder on day one. Take the pen or syringe out of the fridge 15 to 30 minutes before injecting. Cold liquid stings more. Do not warm it in the microwave or hot water. Inject into the front of the thigh or the belly, at least two inches from the navel. Rotate the spot each time, and avoid skin that is bruised, red, hard, tender or scarred. Never inject through a plaque. A nurse or pharmacist should train you in person for the first dose. Used pens go in a sharps container, never the household bin.
If you miss a dose: Inject as soon as you remember, then return to your original schedule rather than shifting future doses. Never inject two doses to catch up. If you have missed more than one dose, call the prescriber before restarting — long gaps can blunt how well it works.
What to Expect
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Side Effects
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Most of what people actually notice is at the injection site. The list below is longer than the average person's experience of it, and the infection risk is the part that shapes the monitoring.
Common — expected, and they settle
- Injection site reaction Redness, itching or stinging for a day or two.
- Colds and sinus infections
- Headache
- Rash
Tell your doctor — worth a call, not an emergency
- An infection that is not clearing A cough, a fever, or urinary symptoms.
- A painful rash in a band, or blisters Shingles.
- New or worsening psoriasis This class of drug can set it off.
- A new lump or a changing mole Keep up your skin checks.
- Numbness, tingling or vision changes Uncommon, but needs assessing.
- Any live vaccine you are offered Ask your doctor first.
Stop and get care
- Fever with shaking chills or feeling very ill: Infection needs treating fast on this drug.
- A cough with fever, night sweats and weight loss: Tuberculosis is screened for before you start and watched for after.
- Breathlessness with swelling and a fast pulse
What to Avoid
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- Live vaccines A weakened live germ, so they are avoided on adalimumab — measles-mumps-rubella, chickenpox, yellow fever and the nasal spray flu vaccine. Get any you need before starting. Non-live vaccines, including the standard flu shot, COVID vaccines, pneumonia vaccines and Shingrix, are usually encouraged.
- Injecting during a fever or infection Hold the dose and call the prescriber. A chest infection, an infected wound, or anything on antibiotics counts.
- Injecting into a plaque or bruise Hard, red or tender skin counts too. Absorption is less reliable and it hurts more.
- Letting the pen freeze or overheat Sitting in sunlight counts. A dose that has frozen or sat in a hot car should not be used.
- Close contact with chickenpox or measles This matters if you are not immune. Call your doctor if you are exposed.
- Reusing or sharing pens and needles Every pen is single use, even if liquid is left in the window.
Monitoring
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Everyone is screened for tuberculosis before the first dose — a skin test or TB blood test, often with a chest X-ray. TNF blockers can wake a dormant TB infection, so a positive screen is treated first and adalimumab waits until that treatment is under way. Testing is often repeated yearly, or sooner if you live somewhere TB is common.
Hepatitis B and C are checked too, because hepatitis B can reactivate when the immune signal is blocked.
After that there is no fixed blood test schedule like methotrexate's. Many doctors check a blood count and liver tests occasionally. Most monitoring is clinical — how the skin looks, and whether you are getting more infections than usual.
Skin should be checked periodically, because TNF blockers are linked to a small increase in skin cancer. The label also carries a boxed warning about serious infections and about lymphoma and other cancers, based mostly on rare cases in children and young adults. The absolute risk is low, but it is why this prescription gets regular review.
If You Stop
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No taper and no withdrawal. Stopping does not cause the sudden severe flare that stopping oral steroids can. Psoriasis does return. For most people plaques start coming back one to four months after the last dose, sometimes gradually enough that it is not obvious at first. Restarting after a long break does not always work as well. During a gap your body can make antibodies against the drug, which clear it faster and blunt the effect. That is the practical reason not to let doses drift or stop without telling the prescriber. A planned pause for surgery or infection is different.
Cost
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The list price is very high, tens of thousands of dollars a year. Almost nobody pays that. What you pay depends on your insurance, and getting there takes paperwork. Prior authorization is close to universal. Most plans require you to have tried and failed something cheaper first — phototherapy, methotrexate or another systemic drug — and they want records to prove it. Biosimilars changed the picture. Several have been sold in the United States since 2023, some at much lower list prices. Which one you get is usually decided by your plan's formulary, not your dermatologist, and plans switch year to year. A switch is a paperwork event, not a medical downgrade, though you may need retraining on a different pen. Manufacturer copay cards can bring the cost down to very little with commercial insurance. By law they cannot be used with Medicare or Medicaid. For those plans, or with no insurance, manufacturer and foundation assistance programs are the usual route, and their rules change often.
Ask Your Doctor
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How It Compares
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Myths
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- "A biologic is a form of chemotherapy." It is not. Chemotherapy kills fast-dividing cells throughout the body. Adalimumab is an antibody that binds one inflammation signal and leaves the rest alone.
- "It shuts down your whole immune system." It blocks one messenger out of many, and most people on it do not get serious infections. The risk is genuinely higher than average, which is why TB screening and early treatment matter, but that is a long way from having no immune system.
- "You can never have vaccines again." Non-live vaccines are fine and usually recommended. Only live vaccines are avoided.
- "Biosimilars are cheap knock-offs." A biosimilar has to be shown to have no clinically meaningful difference from the original. The device may feel different; the drug does the same job.
- "Once you start, you can never stop." You can stop, and people do, for pregnancy planning, surgery or side effects. The honest caution is that psoriasis usually returns and restarting may work less well.
Questions Patients Ask
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What does biologic actually mean?
A large protein grown in living cells rather than a factory chemical. That is why it is injected, and why it lives in the fridge.
Does the injection hurt?
A sharp sting for a few seconds. Letting it warm to room temperature first makes a real difference, and citrate-free versions sting less than the original.
How long before I know if it is working?
Some change by 4 weeks, and about 16 weeks before you judge it fairly. If nothing has happened by then, talk about switching.
Can I still have vaccines?
Yes, apart from live ones. The flu shot, COVID, pneumonia vaccines and Shingrix are fine and usually recommended. Have live vaccines before you start.
What do I do if I catch a cold or need antibiotics?
A simple cold is usually not a reason to skip a dose. Anything with a fever, or needing antibiotics, should be checked with the prescriber first.
Is a biosimilar as good as Humira?
It must be shown to have no clinically meaningful difference from the original. The pen changes; what is inside does the same job.
References
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- Sbidian E, Chaimani A, Guelimi R, et al. Systemic pharmacological treatments for chronic plaque psoriasis: a network meta-analysis. The Cochrane database of systematic reviews. 2025. — The Cochrane database of systematic reviews, 2025
- Sbidian E, Chaimani A, Garcia-Doval I, et al. Systemic pharmacological treatments for chronic plaque psoriasis: a network meta-analysis. The Cochrane database of systematic reviews. 2022. — The Cochrane database of systematic reviews, 2022
- Garg A, Cohn E, Midgette B, et al. Efficacy and Safety of Medical Interventions for Moderate to Severe Hidradenitis Suppurativa: A Living Systematic Review and Network Meta-Analysis. JAMA dermatology. 2025. — JAMA dermatology, 2025
- Kimball AB, Okun MM, Williams DA, et al. Two Phase 3 Trials of Adalimumab for Hidradenitis Suppurativa. The New England journal of medicine. 2016. — The New England journal of medicine, 2016
- Scott FI, Ananthakrishnan AN, Click B, et al. AGA Living Clinical Practice Guideline on the Pharmacologic Management of Moderate-to-Severe Crohn's Disease. Gastroenterology. 2025. — Gastroenterology, 2025
- Singh S, Loftus EV, Limketkai BN, et al. AGA Living Clinical Practice Guideline on Pharmacological Management of Moderate-to-Severe Ulcerative Colitis. Gastroenterology. 2024. — Gastroenterology, 2024