Why is Evrysdi So Expensive for SMA Patients?
Evrysdi, also known as risdiplam, is a disease-modifying treatment taken once daily that helps the SMN2 gene produce more functional survival motor neuron protein. One reason Evrysdi is so expensive is that it treats a relatively small rare-disease population while requiring extensive research, clinical trials, regulatory development, manufacturing, and long-term scientific investment. Its drug-pricing approach considers clinical benefit, differences from existing therapies, patient and caregiver perspectives, and the need to sustain future medical innovation.
The financial impact can be substantial because Evrysdi is an ongoing treatment rather than a one-time therapy. A 2025 analysis from the Institute for Clinical and Economic Review estimated Evrysdi's annual wholesale acquisition cost at approximately $409,445, with an estimated net price of about $358,265 after assumed discounts. The amount an individual actually pays can be very different because insurance coverage, negotiated prices, deductibles, copayments, assistance programs, age, and dosing needs all influence out-of-pocket costs. Evrysdi dosing is based partly on age and body weight, with patients age 2 and older who weigh at least 20 kilograms generally receiving 5 mg daily. For SMA families, the financial burden can also extend beyond medication to specialist visits, respiratory care, physical therapy, mobility equipment, caregiving, transportation, and other disability-related expenses.
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