Is Dupixent an immunosuppressant?

Medically reviewed by Carmen Pope, BPharm. Last updated on June 25, 2025.

Official Answer by Drugs.com

No, Dupixent (dupilumab) is not an immunosuppressant or a steroid. Dupixent works by targeting a type of protein called an interleukin, that is involved in inflammation. Dupixent calms an overreactive immune system but does not suppress the immune system. This leads to fewer and less severe episodes of inflammation when used to treat conditions such as eczema, asthma, COPD, rhinosinusitis, esophagitis, chronic spontaneous urticaria, prurigo nodularis, or bullous pemphigoid.

Research has found no evidence that Dupixent reactivates latent infections, such as tuberculosis or hepatitis B, increases the risk of invasive fungal infections or unusual opportunistic infections, nor increases the progression of cancer. Most medicines that have immunosuppressive properties increase the risk of all of these happening.

How does Dupixent work?

Dupixent is a human monoclonal IgG4 antibody that works by blocking the signaling (transmitting of messages) of two inflammatory proteins, called interleukin-4 (IL-4) and interleukin-13 (IL-13). It does this by binding to the site that these two proteins bind to, which is called the IL-4Rα subunit. When Dupixent occupies this subunit, it prevents IL-4 signaling via the Type I receptor and both IL-4 and IL-13 signaling through the Type II receptor.

Usually, interleukins play an important role in the immune system by helping to fight off invading organisms, such as bacteria and viruses. In some chronic conditions, such as atopic dermatitis (also called eczema), the immune system becomes over-reactive, and interleukins mistakenly attack the body. By blocking the effects of interleukins, Dupixent curbs this overreaction of the immune system, allowing the skin to repair and heal.

Research has also shown that in eczema, Dupixent helps to decrease colonization of a naturally occurring skin bacteria, called Staphylococcus, helping to normalize the skin microbiome. This improves the way a person’s immune system can function against infections.

How Dupixent works in asthma and chronic rhinosinusitis is not completely understood; however, it is believed to be due to an inhibition of the IL-4 and IL-13 cytokine-induced inflammatory response which reduces the release of other inflammatory substances, such as proinflammatory cytokines, chemokines, nitric oxide, and IgE.

For eosinophilic esophagitis (EoE), Dupixent targets interleukins and relieves the underlying source of inflammation that contributes to EoE, reducing EoE symptoms. Until Dupixent, treatment options were limited to proton pump inhibitors (PPIs), swallowed topical corticosteroids, and food elimination diets.

By controlling inflammation associated with interleukins under the skin associated with urticaria, prurigo nodularis, or bullous pemphigoid. Dupixent helps resolves skin symptoms.

For COPD, Dupixent relieves underlying inflammation caused by interleukins that can cause breathing difficulties and an increase in COPD flare-ups.

Why does Dupixent cause eye problems?

Dupixent is associated with several different eye problems, including conjunctivitis, blepharitis, dry eyes, itchy eyes, and keratitis. The cause of the eye problems is thought to be due to Dupixent blocking interleukin-13 (IL-13), an inflammatory protein that also stimulates the production of goblet cells. Goblet cells are responsible for creating mucus in the eye and ensuring the stability of tears. So when Dupixent blocks IL-13 it also lowers the numbers of epithelial goblet cells leading to eye inflammation and eye problems. Continue reading

Does Dupixent cause weight gain?

Yes, it does appear that Dupixent can cause weight gain, although this is not listed as a side effect in the product information. A case series of 12 people prescribed Dupixent reported an average weight gain of 6.1kg over one year – the amount of weight gained ranged from 0.1kg to 18.0kg. Anecdotally, blog sites also report weight gain as a side effect. How Dupixent causes weight gain is not known; however, people should be informed that weight gain may be a possible side effect of Dupixent. Continue reading

How long can Dupixent stay out of the fridge?

Dupixent can stay out of the fridge for a maximum of 14 days at room temperature (up to 77°F [25°C]). If you do not use it within 14 days, then it must be thrown away. Do not expose Dupixent to temperatures above 77°F and do not put it back in the refrigerator if it has been inadvertently left out and allowed to warm up to room temperature. Continue reading

Is Dupixent an immunosuppressant?

How does Dupixent work?

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