Cladribine and Natalizumab can adversely interact

Stuart SchlossmanOral MS Medications, Tysabri

August 21, 2010
written by: Cherie C. Binns RN BS MSCN

As I am researching interaction potential between Cladribine (may be approved within the next 3-6 months for treatment of multiple sclerosis) and medications that may adversely interact, natalizamab or Tysabri comes up. 

According to this link: http://www.drugs.com/drug-interactions/cladribine-with-natalizumab-684-0-1693-0.html  administration of Cladribine to someone who has taken Tysabri has the potential to increase the risk of PML.  It does not say if there is a washout period of Tysabri prior to initiation of Cladribine.

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