FDA OKs Janssen's psoriasis drug

The Food and Drug Administration on Thursday approved Janssen Biotech's psoriasis treatment Tremfya.

Here are three things to know.

1. Tremfya is the only approved biologic drug that targets a specific protein secreted by cells that plays a main role in plaque psoriasis.
   
   

2. Psoriasis patients receive Tremfya as an injection every eight weeks, with a dose administered at the first and fourth week to start.
   
   

3. In a recent clinical trial, more than 7 out of 10 patients taking Tremfya had 90 percent clearer skin at week 24, compared to 4 out of 10 patients taking AbbVie's rival drug Humira.
   
   

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