For most adults and teens 12 and older with asthma, Dupixent is taken as one injection every two weeks. The first dose is a loading dose (two injections given on the same day), and then you continue with a single injection every 14 days on an ongoing basis. Children aged 6 to 11 follow a different schedule based on their weight.
Adult and Adolescent Dosing Schedule
If you’re 12 or older, Dupixent for asthma follows one of two dosing tracks depending on your situation. Both use the same every-two-weeks frequency, but the milligram strength differs.
The standard track starts with a loading dose of 400 mg (two 200 mg injections on day one), then 200 mg every two weeks after that. The higher-dose track starts with 600 mg (two 300 mg injections on day one), then 300 mg every two weeks. Your doctor will prescribe the higher dose if you take daily oral corticosteroids for your asthma, or if you also have moderate-to-severe eczema or chronic sinusitis with nasal polyps.
Dosing for Children Ages 6 to 11
Children in this age range are dosed by weight, and there is no loading dose. Kids weighing 30 kg (about 66 pounds) or more get 200 mg every two weeks. Smaller children, between 15 and 30 kg, get 300 mg every four weeks instead. That once-monthly schedule is unique to this weight group. If a child in this age range also has moderate-to-severe eczema, the dosing may shift to a different schedule that includes a loading dose, so the prescribing details can vary.
Who Qualifies for Dupixent
Dupixent is FDA-approved as an add-on maintenance treatment for moderate-to-severe asthma in patients 6 months and older. It’s not for every type of asthma. You need to have either an eosinophilic phenotype, meaning your asthma is driven by a specific type of white blood cell called eosinophils, or oral corticosteroid-dependent asthma, where you rely on steroid pills or liquid to keep symptoms controlled. Blood tests and your symptom history help determine which category you fall into.
How Dupixent Works in the Airways
Dupixent blocks two inflammatory signals, IL-4 and IL-13, that are major drivers of the allergic-type inflammation behind eosinophilic asthma. It does this by attaching to a shared receptor that both signals use, shutting down the pathway at its source. This dual blockade is important because blocking only one of the two isn’t enough to fully reduce the kind of inflammation that narrows your airways and triggers flare-ups. One notable effect: Dupixent prevents eosinophils from infiltrating lung tissue specifically, which is where they cause the most damage, without necessarily changing eosinophil levels in your blood.
How Quickly It Works
Many people notice improvement in lung function within the first two weeks of treatment. Data from clinical trials showed measurable gains that early, and real-world studies confirm that the largest treatment benefits often appear within the first three months. That said, Dupixent is a long-term maintenance therapy, not a rescue treatment. You’ll keep taking your other asthma controllers as prescribed, and your doctor may gradually adjust them over time as your symptoms improve.
How to Give the Injection
Dupixent is a subcutaneous injection, meaning it goes into the fatty tissue just under the skin. You can inject into your thigh, the outer area of your upper arm (a caregiver should do this site for you), or your stomach at least two inches away from your belly button. Rotate the site each time. Don’t inject into skin that’s tender, bruised, damaged, or scarred. The medication comes in prefilled syringes or pens, and most people learn to do it at home after their first session with a healthcare provider.
What to Do if You Miss a Dose
If you miss your scheduled injection, you have a seven-day window to take it late. Give yourself the injection as soon as you can within those seven days, then pick back up on your original schedule. If more than seven days have passed since the missed dose, skip it entirely and wait for your next regularly scheduled injection. Don’t double up to make up for a missed dose.