Dornase Alfa

Dornase alfa is typically prescribed to help improve lung function in people with cystic fibrosis. It is a synthetic version of a naturally occurring human enzyme called deoxyribonuclease I. The drug works by breaking down the extra DNA that often causes sputum (mucus) to become thick. As a result, lung function is improved. Side effects of dornase alfa include sore throat, runny nose, and chest pain.

Dornase Alfa -- Cystic Fibrosis Medication

What Is Dornase Alfa?

Dornase alfa (Pulmozyme^®) is a prescription medication used to improve lung function in people with cystic fibrosis (CF).

(Click What Is Dornase Alfa Used For? for more information, including possible off-label uses.)

Who Makes Dornase Alfa?

Dornase alfa is made by Genentech, Inc.

How Does Dornase Alfa Work?

Dornase alfa is a manufactured version of a naturally occurring human enzyme called deoxyribonuclease I. This enzyme breaks down deoxyribonucleic acid (DNA), particularly DNA found outside of cells. Research has shown that the fluid in the airways of people with cystic fibrosis has too much DNA, usually caused by the breakdown of cells that are fighting lung infections. This DNA causes the lung secretions (known as sputum) to become more thick, causing breathing problems with the infections. This becomes a problematic cycle, with infections causing more DNA, and more DNA causing more infections.

Dornase alfa works by breaking down this extra DNA, helping to thin the sputum. This, in turn, helps to improve lung function and decrease the risk of lung infections.

Effects of Dornase Alfa

In studies, dornase alfa decreased the risk of lung infections that required treatment with IV antibiotics by up to 29 percent. It also improved lung function, as measured by breathing tests. Studies suggest that the drug is more effective in younger people and is less effective in people with poor lung function.

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