LAVAL - BELLUS Health Inc. (Nasdaq: BLU; TSX: BLU) ('BELLUS Health' or the 'Company'), a clinical-stage biopharmaceutical company working to better the lives of patients suffering from persistent cough, starting with the development of camlipixant (BLU-5937) for the treatment of refractory chronic cough ('RCC'), today reported its financial and operating results for the quarter ended March 31, 2023.

'Our merger agreement with GSK underscores our corporate and clinical achievements to date and marks the start of a new chapter for our potentially best-in-class P2X3 receptor antagonist, camlipixant,' commented Roberto Bellini, President and Chief Executive Officer of BELLUS Health. 'We are confident that GSK's resources and focused expertise in the development and commercialization of respiratory therapies will help us to achieve our mission of bettering the lives of patients suffering from persistent cough. As we work to close this transaction with GSK, we remain committed to advancing our CALM Phase 3 program and are on track to report topline data from CALM-1 in the second half of 2024 and CALM-2 in 2025.'

About BELLUS Health (www.bellushealth.com)

BELLUS Health is a clinical-stage biopharmaceutical company working to better the lives of patients suffering from persistent cough, starting with the development of camlipixant (BLU-5937) for the treatment of refractory chronic cough (RCC). Camlipixant, the Company's lead asset, is an investigational P2X3 receptor antagonist for the treatment of refractory chronic cough (RCC), which is currently being evaluated in the CALM Phase 3 clinical program. With no approved treatments in the U.S., camlipixant has the potential to be a breakthrough in the RCC treatment landscape.

Chronic cough is defined as a cough lasting longer than eight weeks. When the cause of chronic cough cannot be identified or the cough persists despite treatment of any associated condition, the condition is referred to as RCC. RCC is a frequent, yet often under-recognized, medical condition that has significant physical, social, and psychological consequences on one's quality of life. There are currently no approved treatments for this condition in the United States, European Union or the United Kingdom.

Forward-Looking Statements

Certain statements contained in this news release, other than statements of fact that are independently verifiable at the date hereof, may constitute 'forward-looking statements' within the meaning of Canadian securities legislation and regulations, the U.S. Private Securities Litigation Reform Act of 1995, as amended, and other applicable securities laws. Forward-looking statements are frequently, but not always, identified by words such as 'expects,' 'anticipates,' 'believes,' 'intends,' 'estimates,' 'potential,' 'possible,' 'projects,' 'plans,' and similar expressions. Such statements, based as they are on the current expectations of management, inherently involve numerous important risks, uncertainties and assumptions, known and unknown, many of which are beyond BELLUS Health's control. Such statements include, but are not limited to, the closing of the acquisition of BELLUS Health by GSK, the timeline thereof and the realization of the anticipated benefits from the transaction, the potential of camlipixant (BLU-5937) to successfully treat RCC and other hypersensitization-related disorders and benefit such patients, BELLUS Health's expectations related to its preclinical studies and clinical trials, including the completion of its Phase 3 clinical trials of camlipixant in RCC and the expected timing of topline results from CALM-1 and CALM-2 Phase 3 clinical trials, the timing and outcome of interactions with regulatory agencies, the ability of BELLUS Health to validate its use of the VitaloJAK cough monitoring system to the satisfaction of relevant regulatory agencies, the potential activity and tolerability profile, selectivity, potency and other characteristics of camlipixant, including as compared to other competitor candidates, especially where head-to-head studies have not been conducted and cross-trial comparisons may not be directly comparable due to differences in study protocols, conditions and patient populations, the commercial potential of camlipixant, including with respect to patient population, pricing and labeling and potential treatment alternatives, BELLUS Health's financial position and sufficiency of cash resources to bring through topline results of CALM-1 and CALM-2 clinical trials, timely or at all, and the potential applicability of camlipixant, BELLUS Health's P2X3 receptor platform to treat other disorders. Risk factors that may affect BELLUS Health's future results include but are not limited to: risks associated with the closing of the acquisition of BELLUS Health by GSK on the expected timeline, including as regards regulatory and shareholder approvals, the intended benefits, acceptability to regulatory agencies and impact of its enrichment strategy, continuing feedback and discussions with the FDA and other regulatory authorities regarding the design of the CALM Phase 3 program, estimates and projections regarding the size and opportunity of the addressable RCC market for camlipixant, the ability to expand and develop its project pipeline, the ability to obtain adequate financing, the ability of BELLUS Health to maintain its rights to intellectual property and obtain adequate protection of future products through such intellectual property, the impact of general economic conditions, general conditions in the pharmaceutical industry, the impact of the ongoing COVID-19 pandemic on BELLUS Health's operations, plans and prospects, including to the initiation and completion of clinical trials in a timely manner or at all, changes in the regulatory environment in the jurisdictions in which BELLUS Health does business, supply chain impacts, stock market volatility, fluctuations in costs, changes to the competitive environment due to consolidation, achievement of forecasted burn rate, achievement of forecasted preclinical study and clinical trial milestones, reliance on third parties to conduct preclinical studies and clinical trials for camlipixant, that final data from studies and clinical trials may differ from reported data from preliminary studies or clinical trials and that actual results may differ from topline results once the final and quality-controlled verification of data and analyses has been completed. In addition, the length of BELLUS Health's product candidate's development process and its market size and commercial value are dependent upon a number of factors. Moreover, BELLUS Health's growth and future prospects are mainly dependent on the successful development, patient tolerability, regulatory approval, commercialization and market acceptance of its product candidate camlipixant and other products. Consequently, actual future results and events may differ materially from the anticipated results and events expressed in the forward-looking statements. BELLUS Health believes that expectations represented by forward-looking statements are reasonable, yet there can be no assurance that such expectations will prove to be correct. The reader should not place undue reliance, if any, on any forward-looking statements included in this news release. These forward-looking statements speak only as of the date made, and BELLUS Health is under no obligation and disavows any intention to update publicly or revise such statements as a result of any new information, future event, circumstances or otherwise, unless required by applicable legislation or regulation.

Contact:

Ramzi Benamar

Email: rbenamar@bellushealth.com

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