 Dupixent helps people with asthma breathe better in as little as two weeks. And when you can breathe better, what isn't better? This is better. This is better. That's better. And that. Even this. Dupixent is an add-on treatment for specific types of moderate to severe asthma. It works with your asthma medicine to help improve lung function. That's pretty good. Dupixent is not for sudden breathing problems. It's proven to help prevent asthma attacks.