Dupixent helps you du more with less asthma. and can help you breathe better in as little as 2 weeks. dupixent is an add-on treatment for specific types of moderate-to-severe asthma that's not or sudden breathing problems. dupixent can cause allergic reactions that can be severe. get help right away if you have rash, chest pain, worsening shortness of breath, tingling or numbness in your limbs. tell your doctor about new or worsening joint aches and pain, or a parasitic infection. don't change or stop asthma medicines, including steroids, without talking to your doctor. ask your specialist abo...