PGx SIPONIMOD

Scientifically reviewed | Last updated July 07. 2025
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CYP2C9

The active substance siponimod (Mayzent®) is intended for the treatment of secondary progressive multiple sclerosis (SPMS). This condition is characterized by a progression of neurological impairments independent of relapses for at least six months.

 

The drug is metabolized by the polymorphic enzyme CYP2C9. According to the manufacturer's prescribing information, siponimod is contraindicated in patients with the CYP2C9*3/*3 genotype. Moreover, genotyping is important to determine the individual dosing for each patient. Therefore, according to the prescribing information, genotyping is mandatory for all patients prior to initiating long-term therapy with siponimod (Mayzent®).

 

The CYP2C9*2 and *3 alleles are each associated with reduced enzyme activity, leading to a slower metabolism of substrates. In the Caucasian population, the proportion of “poor metabolizers” is approximately 4%, while “intermediate metabolizers” account for about 30%.

 

References

Summary of product characteristics Mayzent

GENES
CYP2C9
HOW CAN YOU GET TESTED?
Step 1: Visit healthcare professional
Step 2: Sample collection (blood or buccal swab)
Step 3: Sequencing performed at our accredited laboratory
Step 4: Medical report
Step 5: Genetic counselling
FAQ

How long does it take to receive PGx Siponimod test results?

How do pharmacogenetic insights support personalized treatment decisions?

In which clinical scenarios should PGx Siponimod diagnostic testing be considered?

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