DUBLIN, Ireland - Avadel Pharmaceuticals plc (Nasdaq: AVDL), a biopharmaceutical company focused on transforming medicines to transform lives, provided a corporate update, and announced its financial results for the first quarter ended March 31, 2022.

'As our NDA for FT218 continues in late-stage review, we stand at a pivotal moment for the company and our stakeholders, ready and excited to bring this important medicine to people living with narcolepsy. As we have communicated in the past, based on our interactions with the FDA to date, we continue to believe in the full approvability of FT218, and are devoted to continuing to work with the FDA to complete the review of our NDA,' said Greg Divis, Chief Executive Officer of Avadel Pharmaceuticals. 'I am pleased with the resilience of our team, and with our presentation of important interim results from the ongoing open-label RESTORE study of FT218, which continue to add to the totality of evidence demonstrating the great unmet need that exists for a once-at-bedtime oxybate therapy for people living with narcolepsy. The expertise of our team, strong body of clinical evidence supporting the overall value proposition of FT218, and our financial stability, well-position us as the review of our NDA continues and we move closer to potentially launching FT218.'

First Quarter and Recent Company Highlights

Avadel continues to have interactions with the U.S. Food and Drug Administration (FDA) as it relates to the review of the New Drug Application (NDA) for FT218, which Avadel believes is ready for final Agency action. The FDA has maintained they have no outstanding questions or information requests and do not currently need any additional data.

Launch readiness activities progress on-track to support the potential commercialization of FT218, which, if approved, would be the first and only once-at-bedtime option for managing excessive daytime sleepiness (EDS) and cataplexy in narcolepsy.

Presented interim data from the open-label RESTORE study at the 2022 American Academy of Neurology (AAN) Annual Meeting highlighting results from questionnaires on patient preference and experience with oxybates.

At an interim data cutoff date of September 7, 2021, 35 participants who switched from twice-nightly oxybates to once-at-bedtime FT218 completed patient preference questionnaires three months after switching, with responses indicating that 94.3% (33/35 participants) preferred the once-at-bedtime versus twice-nightly dosing regimen.

As of the data cutoff, 60 participants who switched from twice-nightly oxybates to once-at-bedtime FT218 also completed a nocturnal adverse event questionnaire prior to switching to assess their experiences with the second nightly sodium oxybate dose. Results included:

38 (63%) participants unintentionally missed their second twice-nightly oxybate dose within the preceding three months. Of these participants, 84% indicated that their narcolepsy symptoms were worse the next day.

24 (40%) participants reported that they had taken their second dose more than four hours after the first dose. Of these participants, 42% (10/24) reported feeling somewhat, quite a bit or extremely groggy or unsteady the next morning.

For 73% (44/60) of participants, taking a second nighttime dose was characterized as somewhat, quite a bit or extremely inconvenient, with 54 (90%) reporting that they arose from bed after the second dose, three reporting associated falls and two reporting injuries. In addition, anxiety or concern related to taking the second dose and the need for someone else to wake them were reported by 20% and 23% of participants, respectively.

Presented multiple posters at World Sleep 2022, including new data that contributes to the growing body of evidence to support the potential benefit of FT218 for people living with narcolepsy.

Published positive secondary endpoint data from the REST-ON trial of FT218 in CNS Drugs.

At all doses evaluated (6g, 7.5g and 9g), FT218 demonstrated a statistically significant decrease in the number of transitions from stages N1, N2, N3, and rapid eye movement (REM) sleep to wake. Sleep quality and refreshing nature of sleep were significantly improved with all evaluated doses compared to placebo.

Completed the exchange and an eight-month maturity extension on $117.4 million of the $143.8 million of senior unsecured convertible notes due 2023.

$117.4 million of convertible notes that were exchanged mature on October 2, 2023.

$26.4 million remaining from the 2023 convertible notes mature on February 1, 2023.

About FT218

FT218 is an investigational formulation of sodium oxybate leveraging our proprietary drug delivery technology and designed to be taken once-at-bedtime for the treatment of excessive daytime sleepiness (EDS) or cataplexy in adults with narcolepsy.

In March 2020, Avadel completed the REST-ON study, a randomized, double-blind, placebo-controlled, pivotal Phase 3 trial, to assess the efficacy and safety of FT218 in patients with narcolepsy. Among the three co-primary endpoints, FT218 demonstrated statistically significant and clinically meaningful results in EDS, the clinician's overall assessment of the patient's functioning, and reduction in cataplexy attacks, for all three evaluated does when compared to placebo.

In January 2018, the U.S. Food and Drug Administration (FDA) granted FT218 Orphan Drug Designation for the treatment of narcolepsy based on the plausible hypothesis that FT218 may be safer than the twice-nightly formulation of sodium oxybate already approved by the FDA due to the ramifications associated with dosing regimen of that product. FT218 is currently under review by the FDA.

About Avadel Pharmaceuticals plc

Avadel Pharmaceuticals plc (Nasdaq: AVDL) is a biopharmaceutical company focused on transforming medicines to transform lives. Our approach includes applying innovative solutions to the development of medications that address the challenges patients face with current treatment options. Our current lead drug candidate, FT218, is an investigational formulation of sodium oxybate leveraging our proprietary drug delivery technology and designed to be taken once at bedtime for the treatment of EDS and cataplexy in adults with narcolepsy. For more information, please visit www.avadel.com.

Cautionary Disclosure Regarding Forward-Looking Statements

This press release includes 'forward-looking statements' within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These forward-looking statements relate to our future expectations, beliefs, plans, strategies, objectives, results, conditions, financial performance, prospects, or other events. Such forward-looking statements include, but are not limited to, expectations regarding the FDA's review of the NDA for FT218, the commercial launch of FT218 (if approved), the market acceptance of FT218 (if approved), the potential therapeutic benefit of FT218, the continued advancement of the RESTORE study to generate long-term safety, tolerability, and efficacy data for FT218, and the expected maturity of the Company's notes. In some cases, forward-looking statements can be identified by the use of words such as 'will,' 'may,' 'could,' 'believe,' 'expect,' 'look forward,' 'on track,' 'guidance,' 'anticipate,' 'estimate,' 'project,' 'next steps' and similar expressions, and the negatives thereof (if applicable).

The Company's forward-looking statements are based on estimates and assumptions that are made within the bounds of our knowledge of our business and operations and that we consider reasonable. However, the Company's business and operations are subject to significant risks, and, as a result, there can be no assurance that actual results and the results of the company's business and operations will not differ materially from the results contemplated in such forward-looking statements. Factors that could cause actual results to differ from expectations in the Company's forward-looking statements include the risks and uncertainties described in the 'Risk Factors' section of Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2021, which was filed with the Securities and Exchange Commission (SEC) on March 16, 2022, and subsequent SEC filings.

Forward-looking statements speak only as of the date they are made and are not guarantees of future performance. Accordingly, you should not place undue reliance on forward-looking statements. The Company does not undertake any obligation to publicly update or revise our forward-looking statements, except as required by law.

Contact:

Investor

Courtney Turiano

Stern Investor Relations, Inc.

E: Courtney.Turiano@sternir.com

T: (212) 698-8687

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