Siponimod API CAS:1230487-00-9 | Professional Pharma Grade Raw Material for Pharmaceutical Use

Siponimod More Info

Siponimod is an orally administered, selective sphingosine-1-phosphate receptor modulator, with the CAS Registry Number 1230487-00-9. Its molecular structure is designed for high selectivity and affinity for S1P receptor subtypes 1 and 5. This selectivity profile differentiates it from earlier, non-selective S1P modulators and is central to its therapeutic action and safety. The compound functions as a functional antagonist by internalizing the S1P₁ receptor on lymphocytes, thereby preventing their egress from lymph nodes into the central nervous system.

The primary mechanism of action involves the selective and reversible modulation of S1P₁ receptors on lymphocytes. By binding to these receptors, siponimod triggers their internalization, rendering the lymphocytes unresponsive to the S1P gradient that normally guides them out of lymphoid tissues. This leads to a reduction in the circulation of autoreactive lymphocytes, decreasing their infiltration into the central nervous system and the subsequent inflammatory damage that characterizes multiple sclerosis. Its additional action on S1P₅ receptors on oligodendrocytes may contribute to direct neuroprotective effects within the CNS.

The main clinical application of siponimod is for the treatment of relapsing forms of multiple sclerosis, including clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease. It is specifically indicated for adults with secondary progressive MS who have active disease, evidenced by relapses or imaging features of inflammatory activity. This approval addressed a significant unmet need for a therapy that could modify the course of progressive forms of MS, representing a shift from purely anti-inflammatory to potentially neuroprotective strategies.

This medication is administered orally in tablet form, taken once daily. A key feature of its clinical use is the requirement for a dose titration over six days to mitigate the risk of bradycardia upon treatment initiation, which is an effect of initial S1P₁ receptor modulation on cardiac cells. It also requires genetic testing for the CYP2C9 enzyme before initiation, as dose adjustments are necessary for patients with certain genetic variants associated with poor metabolism of the drug, to avoid increased toxicity.

The safety profile of siponimod includes several important risks that necessitate careful monitoring. Common adverse effects include headache, hypertension, elevated liver transaminases, and infections. Serious risks include bradyarrhythmia and atrioventricular conduction delays during treatment initiation, macular edema, increased risk of infections (including cryptococcal meningitis and herpes viral infections), liver injury, and a slight increase in the risk of malignancies, particularly basal cell carcinoma. Its use requires baseline assessments, including a complete blood count, liver function tests, an ophthalmological evaluation, and cardiac monitoring during the first-dose titration period.

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