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FDA Approves New High Dose Regimen of SPINRAZA® (nusinersen) for Spinal Muscular Atrophy
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# FDA Approves New High Dose Regimen of SPINRAZA® (nusinersen) for Spinal Muscular Atrophy **Date:** 2026-03-30 07:30:00 **Company:** Biogen Inc. **Ticker:** BIIB **Source URL:** https://www.globenewswire.com/news-release/2026/03/30/3264519/0/en/FDA-Approves-New-High-Dose-Regimen-of-SPINRAZA-nusinersen-for-Spinal-Muscular-Atrophy.html --- [Accessibility: Skip TopNav](https://www.globenewswire.com/news-release/2026/03/30/3264519/0/en/FDA-Approves-New-High-Dose-Regimen-of-SPINRAZA-nusinersen-for-Spinal-Muscular-Atrophy.html#maincontainer) [](https://www.globenewswire.com/) - [Newsroom](https://www.globenewswire.com/newsroom) - [Services](https://www.globenewswire.com/services) - [Contact Us](https://insight.notified.com/globenewswire-contact-us?utm_medium=Website&utm_source=Contact%20Us&utm_campaign=Contact%20Us%20ENG) - [About Us](https://www.globenewswire.com/about) - English [Sign In](https:...
# FDA Approves New High Dose Regimen of SPINRAZA® (nusinersen) for Spinal Muscular Atrophy **Date:** 2026-03-30 07:30:00 **Company:** Biogen Inc. **Ticker:** BIIB **Source URL:** https://www.globenewswire.com/news-release/2026/03/30/3264519/0/en/FDA-Approves-New-High-Dose-Regimen-of-SPINRAZA-nusinersen-for-Spinal-Muscular-Atrophy.html --- [Accessibility: Skip TopNav](https://www.globenewswire.com/news-release/2026/03/30/3264519/0/en/FDA-Approves-New-High-Dose-Regimen-of-SPINRAZA-nusinersen-for-Spinal-Muscular-Atrophy.html#maincontainer) [](https://www.globenewswire.com/) - [Newsroom](https://www.globenewswire.com/newsroom) - [Services](https://www.globenewswire.com/services) - [Contact Us](https://insight.notified.com/globenewswire-contact-us?utm_medium=Website&utm_source=Contact%20Us&utm_campaign=Contact%20Us%20ENG) - [About Us](https://www.globenewswire.com/about) - English [Sign In](https://www.globenewswire.com/home/signin) [Register](https://portal.notified.com/en/registration) # [](https://www.biogen.com/) # FDA Approves New High Dose Regimen of SPINRAZA® (nusinersen) for Spinal Muscular Atrophy March 30, 2026 07:30 ET\| Source: [Biogen Inc.](https://www.globenewswire.com/en/search/organization/Biogen%2520Inc%C2%A7)FollowBiogen Inc. * * * Share - * * * - The approval was anchored on data from the pivotal DEVOTE study that investigated the efficacy and safety of the High Dose Regimen of SPINRAZA in treatment-naïve and previously treated SPINRAZA patients - High Dose SPINRAZA will be available in the United States in the coming weeks and is also approved in the European Union, Switzerland and Japan CAMBRIDGE, Mass., March 30, 2026 (GLOBE NEWSWIRE) -- [Biogen Inc.](https://www.globenewswire.com/Tracker?data=R1xVhqDIRChhCirwHpbtpxve8Czf0TLzXvaY0vKpKDW2UKaYcRb_EmspX82hIWvDEaJJ2CR8ntxzvkDDFK2SAQ== "Biogen Inc.") (Nasdaq: BIIB) today announced that the High Dose Regimen of SPINRAZA® (nusinersen), which is comprised of 50 mg/5 mL and 28 mg/5 mL doses, was approved by the U.S. Food and Drug Administration (FDA) for the treatment of spinal muscular atrophy (SMA). Backed by more than 10 years of clinical data supporting the Low Dose Regimen of SPINRAZA (12 mg), High Dose SPINRAZA was designed to deliver a higher concentration of drug through both the loading and maintenance dosing phases, to provide a new option in response to the ongoing needs of the community. The High Dose Regimen of SPINRAZA, which will be available in the coming weeks, enables an accelerated loading phase for those new to SPINRAZA treatment – with two 50 mg doses administered 14 days apart – followed by 28 mg maintenance dose injections every four months thereafter. Patients transitioning from the Low Dose Regimen would follow their existing dosing schedule at four-month intervals after a single High Dose loading phase. “Optimizing the dose of nusinersen builds on a therapy that we already know can change lives. The high dose regimen demonstrated meaningful clinical benefit while maintaining a well characterized safety profile,” said Richard Finkel, M.D., director, Center for Experimental Neurotherapeutics (CENT) at St. Jude Children’s Research Hospital. “I believe High Dose Spinraza will play an important role in the future of SMA care.” The FDA approval is based on data from the three-part, Phase 2/3 DEVOTE study. Results from the pivotal cohort of the study showed treatment-naïve, symptomatic infants who received High Dose SPINRAZA experienced statistically significant improvements in motor function as measured by the Children’s Hospital of Philadelphia Infant Test of Neuromuscular Disorders (CHOP-INTEND), when compared to a prespecified matched sham (untreated) group from the ENDEAR study\* (mean difference: 26.19 points; +15.1 vs. -11.1, p<0.0001). “Over the past decade, Biogen has continued to listen, learn, and innovate to help advance care for people living with SMA,” said Priya Singhal, M.D., M.P.H., Executive Vice President and Head of Development at Biogen. “With more than 10 years of clinical data on SPINRAZA, the development of the High Dose Regimen reflects both the strength of that foundation and our unwavering commitment to the SMA community to optimize treatment options. We are grateful to the community for their support and contributions toward this milestone.” In the DEVOTE study, the safety profile of the High Dose Regimen of SPINRAZA was generally consistent with the known safety of the Low Dose Regimen. The most common adverse reactions occurring in at least 10% of SPINRAZA-treated patients who received the High Dose Regimen and occurred at least 5% more frequently than in historic matched sham-control were: pneumonia, COVID-19, pneumonia aspiration, and malnutrition in patients with infantile-onset SMA. COVID-19 was not discovered at the time of ENDEAR, the study from which the matched sham-control was taken. “Nearly ten years ago, the approval of SPINRAZA marked a turning point in SMA care and changed what the community believed was possible, with Biogen becoming a trusted partner for thousands of people living with SMA. Today’s approval of High Dose SPINRAZA makes progress in addressing unmet needs of the SMA community,” said Kenneth Hobby, President of Cure SMA. “Biogen understands the needs of the SMA community and has remained a committed and engaged partner to advance research that can improve the daily lives of people living with SMA.” High Dose SPINRAZA is also approved in the European Union, Switzerland, and Japan, and Biogen is working with regulatory authorities and national health authorities around the world to progress this additional dosing option for people living with SMA. \*ENDEAR is one of the two pivotal studies that formed the basis of regulatory approvals for SPINRAZA 12 mg. **WHAT IS SPINRAZA?** SPINRAZA® (nusinersen) is a prescription medicine used to treat spinal muscular atrophy (SMA) in pediatric and adult patients. **IMPORTANT SAFETY INFORMATION** **Increased risk of bleeding complications** has been observed after administration of similar medicines. Your healthcare provider should perform blood tests before you start treatment with SPINRAZA and before each dose to monitor for signs of these risks. Seek medical attention if unexpected bleeding occurs. **Increased risk of kidney damage, including potentially fatal acute inflammation of the kidney**, has been observed after administration of similar medicines. Your healthcare provider should perform urine testing before you start treatment with SPINRAZA and before each dose to monitor for signs of this risk. **The most common side effects of SPINRAZA in the Low Dose Regimen** in infantile- and later- onset SMA include lower respiratory infection, constipation, fever, headache, vomiting, back pain, and post-lumbar puncture syndrome. **The most common side effects of SPINRAZA in the High Dose Regimen** in infantile-onset SMA include pneumonia, COVID-19, pneumonia aspiration, and malnutrition. COVID-19 was not discovered at the time of the studies for the Low Dose Regimen. These are not all of the possible side effects of SPINRAZA. Call your healthcare provider for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. **Before taking SPINRAZA**, tell your healthcare provider if you are pregnant or plan to become pregnant. **Please see full** [**Prescribing Information**](https://www.globenewswire.com/Tracker?data=42Ppw1fUPY0rYriofRGZ0dy1kHvJvnHyy6XZdfRa_hcGe_F-jVujMkwa0FYHrmTNHVuR9LeE6IjGA9J3Q9XGA_L_1SVVe00u4-MAR3MKxXNsblaBJ6Z1qvfUaYx18mpl0iaGs77acNf3Oyhs95bFFOlLcqQW8YUNjQO1n-TuRXDVx99kwpO-FEbPyAyflCh4zY2o6ynoaq7ZO0epWrsj1gWHKIkbtV6ZKd5oIZ6Hq0U= "") **.** This information is not intended to replace discussions with your healthcare provider. **About the DEVOTE Study** DEVOTE was a Phase 2/3 randomized, controlled, dose-escalating study designed to evaluate the safety, tolerability, pharmacokinetics, and efficacy of SPINRAZA when administered at a higher dose (50/28 mg). The study enrolled 145 participants across ages and SMA types at approximately 42 sites around the world. DEVOTE included an open-label safety evaluation cohort (Part A), a double-blind, active control randomized treatment cohort (Part B), followed by an open-label treatment cohort (Part C) to assess the safety and tolerability of transitioning participants from the currently approved dose of SPINRAZA 12 mg to the higher dose regimen being tested in the study. Part B was comprised of a pivotal cohort in treatment-naïve patients with infantile-onset SMA (n=75), and a supportive cohort in treatment-naïve patients with later-onset SMA (n=24). The primary endpoint of Part B measured the change from baseline on CHOP-INTEND at six months, comparing the high dose regimen of nusinersen to a matched, untreated sham control group from the Phase 3 ENDEAR study. ENDEAR is one of the two pivotal studies that formed the basis of regulatory approval for SPINRAZA 12 mg. Part C was an open-label evaluation of the higher dose regimen in children and adults who transitioned from SPINRAZA 12 mg to the 50 mg/5 mL and 28 mg/5 mL regimen (n=40). **About SPINRAZA** The High Dose Regimen of SPINRAZA® (nusinersen) comprising a 50 mg/5 mL loading dose and 28 mg/5 mL maintenance dose injections is currently approved in the U.S., European Union, Switzerland, and Japan to treat infants, children and adults with spinal muscular atrophy (SMA). SPINRAZA 12 mg/5 mL injection is approved for SMA in more than 71 countries.1 SPINRAZA is administered intrathecally by, or under the direction of, healthcare professionals experienced in performing lumbar punctures. The Low Dose Regimen of SPINRAZA has shown efficacy across ages and SMA types with a well-established safety profile based on data in patients treated up to 10 years,2,3 combined with unsurpassed real-world experience. The most common adverse events observed in clinical studies were respiratory infection, fever, constipation, headache, vomiting and back pain. Laboratory tests can monitor for renal toxicity and coagulation abnormalities, including acute severe low platelet counts, which have been observed after administration of some ASOs. Biogen licensed the global rights to develop, manufacture and commercialize SPINRAZA from Ionis Pharmaceuticals, Inc. (Nasdaq: IONS). **About Biogen** Founded in 1978, Biogen is a leading biotechnology company that pioneers innovative science to deliver new medicines to transform patients’ lives and to create value for shareholders and our communities. We apply deep understanding of human biology and leverage different modalities to advance first-in-class treatments or therapies that deliver superior outcomes. Our approach is to take bold risks, balanced with return on investment to deliver long-term growth. 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Accordingly, investors should monitor our investor relations website and this social media channel in addition to our press releases, SEC filings, public conference calls and webcasts, as the information posted on them could be material to investors. _References:_ 1. Based on commercial patients, early access patients, and clinical trial participants through December 31, 2024. 2. Core Data sheet, Version 13, October 2021. SPINRAZA. Biogen Inc, Cambridge, MA. 3. Finkel et al. Cure SMA 2024. “Final Safety and Efficacy Data From the SHINE Study in Participants With Infantile-Onset and Later-Onset SMA.” | | | | --- | --- | | MEDIA CONTACT:<br>**Biogen**<br>Madeleine Shin<br>+1-781-464-3260<br>[public.affairs@biogen.com](mailto:public.affairs@biogen.com "public.affairs@biogen.com") | INVESTOR CONTACT:<br>**Biogen**<br>Tim Power<br>+1 781 464 2442<br>[IR@biogen.com](mailto:IR@biogen.com "IR@biogen.com") | SPZ-US-6474 03/26  * * * ## Tags [SMA](https://www.globenewswire.com/en/search/tag/sma "SMA")[Spinal Muscular Atrophy](https://www.globenewswire.com/en/search/tag/spinal%2520muscular%2520atrophy "Spinal Muscular Atrophy")[rare disease](https://www.globenewswire.com/en/search/tag/rare%2520disease "rare disease")[ASO](https://www.globenewswire.com/en/search/tag/aso "ASO") GlobeNewswire Company ProfileBiogen Inc.Industry: BiotechnologyWebsite: [https://www.biogen.com/](https://www.biogen.com/) Press Release Actions - [Print](https://www.globenewswire.com/news-release/2026/03/30/3264519/0/en/FDA-Approves-New-High-Dose-Regimen-of-SPINRAZA-nusinersen-for-Spinal-Muscular-Atrophy.html?print=1) - [Download PDF](https://www.globenewswire.com/news-release/2026/03/30/3264519/0/en/FDA-Approves-New-High-Dose-Regimen-of-SPINRAZA-nusinersen-for-Spinal-Muscular-Atrophy.html?pdf=1) - [Subscribe via RSS](https://www.globenewswire.com/rssfeed/organization/hNQxyS-FvexsgfoXWT62ZA==) - [Subscribe via ATOM](https://www.globenewswire.com/atomfeed/organization/hNQxyS-FvexsgfoXWT62ZA==) - [Javascript](https://www.globenewswire.com/JSWidget/organization/pvIS9kdey0lJL6vQ6yvxUg%3d%3d) ## Recommended Reading - March 28, 2026 15:00 ET\|Source: [Biogen Inc.](https://www.globenewswire.com/en/search/organization/Biogen%2520Inc%C2%A7) [Biogen Announces Second Positive Phase 2 Litifilimab Trial in Cutaneous Lupus Erythematosus at 2026 American Academy of Dermatology Annual Meeting, Showing a Significant Reduction in Skin Disease Activity](https://www.globenewswire.com/news-release/2026/03/28/3264201/0/en/Biogen-Announces-Second-Positive-Phase-2-Litifilimab-Trial-in-Cutaneous-Lupus-Erythematosus-at-2026-American-Academy-of-Dermatology-Annual-Meeting-Showing-a-Significant-Reduction-i.html) In the Phase 2 part of the AMETHYST study, litifilimab met the primary endpoint of reduction of disease activity in people living with CLE at Week 16, with more litifilimab participants achieving... 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