Marinus Pharmaceuticals, Inc. (Nasdaq: MRNS), a pharmaceutical company dedicated to developing and commercializing innovative therapeutics to treat seizure disorders, today affirmed its commitment to defending its patent portfolio amidst an Inter Partes Review (IPR) challenge of U.S. Patent 11,110,100 from Ovid Therapeutics, Inc. filed on March 26, 2024. This challenge relates to a Marinus patent for the use of ganaxolone in treating status epilepticus (SE) and refractory status epilepticus (RSE). Marinus has multiple patents relating to ganaxolone for the treatment of SE and RSE.

“Over the past two decades, Marinus has invested more than $100 million into our ganaxolone development programs in SE,” stated Dr. Scott Braunstein, Chairman and CEO of Marinus. “That investment has yielded a strong patent portfolio, fortified by robust clinical data on the pharmacology and effective dosing of ganaxolone, and underscores our commitment to improving the lives of patients and families affected by seizure disorders. We believe this Ovid challenge is without merit and is an unfortunate distraction to the important work we do at Marinus. As a company grounded in scientific research, we will vigorously defend our patents which support our mission of delivering innovative new treatment options to patients with significant unmet needs.”

Between 2021 and 2023, Marinus was granted two method of use patents (U.S. 11,110,100 B2 and U.S. 11,679,117 B2) by the USPTO for intravenous (IV) ganaxolone in the treatment of SE. These patents cover the clinical dosing regimen for SE patients, including those with RSE and super refractory status epilepticus. In Marinus’ Phase 2 trial in RSE, treatment with ganaxolone demonstrated rapid cessation of SE and led to the insight that a minimum plasma concentration of ganaxolone that was maintained over a duration of at least eight hours produced sustained resolution of SE even as the rate of infusion was decreased. This effect was not demonstrated with shorter durations at the target concentration or with lower plasma levels. These findings are described in the Marinus ‘100 Patent and are the basis of the dosing regimen being used in Marinus’ Phase 3 trial in RSE, the first randomized, controlled registration trial that has been conducted in this indication.

Marinus’ first provisional patent application for ganaxolone in SE was filed in February 2015. In August 2016, Ovid filed a provisional patent application on the use of ganaxolone in epileptic disorders, despite having no ganaxolone development programs.

In March 2023, Marinus initiated a Patent Trial and Appeal Board (PTAB) post-grant review (PGR) challenging Ovid’s SE patent for ganaxolone (U.S. 11,395,817 B2) to invalidate the patent prior to Marinus’ potential commercial launch of ganaxolone in SE. Marinus’ petition for PGR argues that the claims of the Ovid ‘817 Patent are invalid and should not have been issued by the USPTO on multiple grounds, including that the claims were anticipated by Marinus’ existing patent application filed in February 2015, and that the claims were obvious over the prior art.

In response to Marinus’ request for PGR, Ovid abandoned 23 of the 31 claims in its patent. The Patent Office subsequently instituted the PGR on the remaining claims. Marinus believes Ovid’s swift action in relinquishing the majority of their claims underscores the merits of the PGR challenge. In instituting the PGR, the PTAB stated that it was more likely than not that Marinus would be able to invalidate the remaining eight claims of the Ovid ‘817 Patent. The PGR process is ongoing, and a final decision is expected by the middle of 2024. Marinus most recent filing in the PGR can be found here.

Marinus emphasizes its long-standing commitment to developing innovative therapies for patients with rare genetic epilepsies and refractory seizure disorders and remains focused on its mission to bring ganaxolone to patients in need.

About Marinus Pharmaceuticals Marinus is a commercial-stage pharmaceutical company dedicated to the development of innovative therapeutics for seizure disorders. The Company first introduced FDA-approved prescription medication ZTALMY® (ganaxolone) oral suspension CV in the U.S. in 2022 and continues to invest in the potential of ganaxolone in IV and oral formulations to maximize therapeutic reach for adult and pediatric patients in acute and chronic care settings. For more information about Marinus visit

Forward-Looking Statements To the extent that statements contained in this press release are not descriptions of historical facts regarding Marinus, they are forward-looking statements reflecting the current beliefs and expectations of management made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Words such as "may", "will", "expect", "anticipate", "estimate", "intend", "believe", and similar expressions (as well as other words or expressions referencing future events, conditions or circumstances) are intended to identify forward-looking statements. Examples of forward-looking statements contained in this press release include, among others, statements regarding the Marinus’ patent portfolio and the related IPR filed by Ovid and the PGR filed by Marinus; and other statements regarding the company's future operations, financial performance, financial position, prospects, objectives and other future events.

Forward-looking statements in this press release involve substantial risks and uncertainties that could cause our clinical development programs, future results, performance or achievements to differ significantly from those expressed or implied by the forward-looking statements. Such risks and uncertainties include, among others, our ability to prevail in the IPR and PGR, the company’s ability to continue as a going concern; unexpected market acceptance, payor coverage or future prescriptions and revenue generated by ZTALMY; unexpected actions by the FDA or other regulatory agencies with respect to our products; competitive conditions and unexpected adverse events or patient outcomes from being treated with ZTALMY, uncertainties and delays relating to the design, enrollment, completion, and results of clinical trials; unanticipated costs and expenses; the company’s cash and cash equivalents may not be sufficient to support our operating plan for as long as anticipated; our ability to comply with the FDA’s requirement for additional post-marketing studies in the required time frames; the timing of regulatory filings for our other product candidates; clinical trial results may not support regulatory approval or further development in a specified indication or at all; actions or advice of the FDA or EMA may affect the design, initiation, timing, continuation and/or progress of clinical trials or result in the need for additional clinical trials; the size and growth potential of the markets for the company’s product candidates, and the company’s ability to service those markets; our ability to develop new formulations of ganaxolone or prodrugs; our ability to obtain, maintain, protect and defend intellectual property for our product candidates; the potential negative impact of third party patents on our or our collaborators’ ability to commercialize ganaxolone; delays, interruptions or failures in the manufacture and supply of our product candidate; the company’s expectations, projections and estimates regarding expenses, future revenue, capital requirements, and the availability of and the need for additional financing; the company’s ability to obtain additional funding to support its clinical development and commercial programs; the potential for our ex-US partners to breach their obligations under their respective agreements with us or terminate such agreements in accordance with their respective terms; the risk that drug product quality requirements may not support continued clinical investigation of our product candidates and result in delays or termination of such clinical studies and product approvals; and the availability or potential availability of alternative products or treatments for conditions targeted by us that could affect the availability or commercial potential of our product candidate. This list is not exhaustive and these and other risks are described in our periodic reports, including the annual report on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, filed with or furnished to the Securities and Exchange Commission and available at Any forward-looking statements that we make in this press release speak only as of the date of this press release. We assume no obligation to update forward-looking statements whether as a result of new information, future events or otherwise, after the date of this press release.

Investors Jim DeNike Senior Director, Investor Relations Marinus Pharmaceuticals, Inc.

Media Molly Cameron Director, Corporate Communications & Investor Relations Marinus Pharmaceuticals, Inc.

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