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Arthritis Health Center

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Deaths Heighten Arthritis Drugs Warning

Enbrel, Humira, Remicade, and Cimzia to Get Stronger Warning About Fungal Infections
WebMD Health News
Reviewed by Louise Chang, MD

Sept. 4, 2008 -- The FDA today ordered stronger warnings about the risk of potentially deadly fungal infections, especially one called histoplasmosis, in people taking the drugs Cimzia, Enbrel, Humira, and Remicade, which are called TNF blockers.

The FDA has received 240 reports of patients taking TNF blockers who developed histoplasmosis, a fungal infection that starts as a respiratory infection and can spread throughout the body.

Of those 240 patients, 45 patients died, including at least 12 who hadn't been diagnosed with histoplasmosis right away, according to Jeffrey Siegel, MD, clinical team leader in the division of anesthesia, analgesia, and rheumatology products at the FDA's Center for Drug Evaluation and Research. The histoplasmosis patients ranged in age from 8 to 86 years; none of the deaths involved children.

The FDA wants patients and doctors to watch for signs and symptoms of histoplasmosis, including persistent fever, cough, shortness of breath, and fatigue.

"Our advice to patients is don't hesitate to call your doctor if you see these signs and symptoms that are related to these types of infection," Siegel said at a news conference today.

Known Risk of Histoplasmosis

It's not news that TNF blockers can raise the risk of infection, including histoplasmosis and other fungal infections. The FDA and doctors already knew about that. Today's FDA action is about how that risk is noted on the drugs' labels.

TNF blockers suppress the immune system and are used to treat conditions including rheumatoid arthritis, juvenile idiopathic arthritis, psoriatic arthritis, plaque psoriasis, ankylosing spondylitis, and Crohn's disease.

All TNF blockers already have "black box" warnings, the FDA's sternest warning, about infection risk. And Cimzia, Remicade, and Humira -- but not Enbrel -- already mention the risk of invasive fungal infections in their black-box warnings.

But no TNF blockers single out histoplasmosis in their black box warning, and the FDA wants that to change.

Stronger Warning for Fungal Infections

"We're going to make sure that all the boxed warnings state clearly that fungal infections -- including in particular histoplasmosis, which is the main one that has come to our attention as having been missed in a number of cases -- will be highlighted," says Siegel.

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