1 July 2026 (Wednesday) - Cladribine

I had a patient with an unexplained neutropenia today. The diagnosis was “multiple sclerosis on cladribine”.
Taken orally as Mavenclad, it is prescribed for adults with active relapsing-remitting multiple sclerosis to reduce the frequency and severity of relapses. However Cladribine is also used in lymphoid neoplasms. It mimics the nucleoside deoxyadenosine but resists breakdown by the enzyme adenosine deaminase, causing it to accumulate inside lymphocytes and interfere with DNA synthesis and repair.
Common side effects include a reduced white blood cell count and an increased risk of viral infections such as shingles or oral herpes.
And it can cause neutropenia too.

 

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