WALTHAM - Innoviva Specialty Therapeutics, a subsidiary of Innoviva, Inc. (Nasdaq: INVA), today announced that XACDURO (sulbactam for injection; durlobactam for injection) is now available in the United States for patients 18 years of age and older for the treatment of hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia (HABP/VABP) caused by susceptible isolates of Acinetobacter baumannii-calcoaceticus complex (Acinetobacter).

XACDURO is not indicated for the treatment of HABP/VABP caused by pathogens other than susceptible isolates of Acinetobacter baumannii-calcoaceticus complex.

'XACDURO's pathogen-targeted approach is a significant advancement in the way healthcare professionals treat Acinetobacter, one of the most serious antibiotic-resistant pathogens known to cause life-threatening pneumonia that is associated with high morbidity and mortality rates,' said Pavel Raifeld, Chief Executive Officer, Innoviva Specialty Therapeutics. 'The addition of XACDURO to our portfolio of critical care medicines underscores our commitment to this space by providing healthcare professionals with differentiated therapeutic options to help improve patient outcomes.'

XACDURO received regulatory approval from the U.S. Food and Drug Administration (FDA) in May 2023 and is now available by prescription through specialty pharmacy distributors in a healthcare setting. The FDA approval was based on strong scientific evidence, including results from the landmark Phase 3 ATTACK trial, published in The Lancet: Infectious Disease, evaluating the safety and efficacy of XACDURO versus colistin in patients with infections caused by Acinetobacter.[3] In the trial, XACDURO demonstrated statistical non-inferiority versus colistin for the primary endpoint of 28-day all-cause mortality in patients with carbapenem-resistant Acinetobacter infections and a significant difference in clinical cure rates.3 XACDURO was well tolerated and exhibited a favorable safety profile across the clinical program. In clinical studies, XACDURO was shown to significantly lower the incidence of nephrotoxicity.3 Fewer serious adverse events were observed compared to treatment with colistin, and there was lower treatment discontinuation due to adverse reactions versus colistin with one patient experiencing anaphylactic shock, which lead to discontinuation of treatment for that patient.3

Acinetobacter infections are now the fifth most common cause of deaths attributable to drug resistance across the globe and pose greatest threat to patients on ventilators in hospitals and nursing homes. The Acinetobacter pathogen has become resistant to most antibiotics used to treat HABP and VABP including carbapenems and third generation cephalosporins. This has caused Acinetobacter to become increasingly difficult to treat with no clear standard-of care antibiotic regimen for these resistant infections.

'Every minute matters when managing critical care patients with life-threatening pneumonia, especially when caused by carbapenem-resistant Acinetobacter baumannii pathogen. Antibiotic-resistant pathogens can complicate treatment strategies and compromise treatment efficacy, often resulting in increased mortality rates for intensive care unit patients,' said Margaret Koziel, MD, Chief Medical Officer, Innoviva Specialty Therapeutics, Inc. 'Other treatment options may have high rates of resistance and adverse events, including nephrotoxicity.[4] The availability of XACDURO is a much-needed advancement that can now provide healthcare professionals with an innovative therapy option to safely and effectively manage Acinetobacter pneumonia.'

About Acinetobacter

Members of the Acinetobacter baumannii-calcoaceticus complex (Acinetobacter) are Gram-negative, opportunistic human pathogens that predominantly infect critically ill patients, often resulting in severe pneumonia and bloodstream infections.[5] They can infect other body sites, such as the urinary tract and the skin.5 Acinetobacter is considered a global threat in the healthcare setting due in part to its ability to acquire multidrug resistance.[6] Acinetobacter is resistant to penicillins and has also acquired resistance genes for almost all antibiotics used to treat Gram-negative bacteria, including fluoroquinolones, aminoglycosides, cephalosporins, and carbapenems.6

The Centers for Disease Control and Prevention (CDC) has identified carbapenem-resistant micro-organisms as an urgent threat.[7] Globally, Acinetobacter baumannii was among the top six leading pathogens for deaths associated with resistance in 2019.[8] Carbapenem-resistant Acinetobacter is considered a Priority 1 pathogen by the World Health Organization (WHO).[9] Globally, there are about a million cases each year of Acinetobacter, and about two-thirds of those are carbapenem-resistant Acinetobacter baumannii.1 More than 300,000 global deaths annually are associated with carbapenem-resistant Acinetobacter.8

About XACDURO

XACDURO (sulbactam for injection; durlobactam for injection), co-packaged for intravenous use, is a combination of sulbactam, a beta-lactam antibacterial, and durlobactam, a beta-lactamase inhibitor, approved in patients 18 years of age and older for the treatment of hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia (HABP/VABP) caused by susceptible isolates of Acinetobacter baumannii-calcoaceticus complex (Acinetobacter). XACDURO is not indicated for the treatment of HABP/VABP caused by pathogens other than susceptible isolates of Acinetobacter.

About Innoviva Specialty Therapeutics

Innoviva Specialty Therapeutics, a subsidiary of Innoviva, Inc., is focused on delivering innovative therapies in critical care and infectious disease. Innoviva Specialty Therapeutics' products, through its affiliate, La Jolla Pharmaceutical Company, include GIAPREZA (angiotensin II), approved to increase blood pressure in adults with septic or other distributive shock, and XERAVA (eravacycline) for the treatment of complicated intra-abdominal infections in adults. Innoviva Specialty Therapeutics' products, through its affiliate, Entasis Therapeutics Inc., include XACDURO (sulbactam for injection; durlobactam for injection), co-packaged for intravenous use approved for the treatment of adults with hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia caused by susceptible strains of Acinetobacter baumannii-calcoaceticus complex (Acinetobacter).

About Innoviva

Innoviva, Inc., is a diversified holding company with a portfolio of royalties and other healthcare assets, including Innoviva Specialty Therapeutics, a subsidiary focused on delivering innovative therapies in critical care and infectious disease. Innoviva's royalty portfolio includes respiratory assets partnered with Glaxo Group Limited (GSK), including RELVAR/BREO ELLIPTA (fluticasone furoate/vilanterol,

FF/VI) and ANORO ELLIPTA (umeclidinium bromide/vilanterol, UMEC/VI). Under the Long-Acting Beta2 Agonist (LABA) Collaboration Agreement, Innoviva is entitled to receive royalties from GSK on sales of RELVAR/BREO ELLIPTA and ANORO ELLIPTA. ANORO, RELVAR and BREO are trademarks of the GSK group of companies.

Forward Looking Statements

This press release contains certain 'forward-looking' statements as that term is defined in the Private Securities Litigation Reform Act of 1995 regarding, among other things, statements relating to goals, plans, objectives, and future events. Innoviva intends such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995. The words 'anticipate', 'expect', 'goal', 'intend', 'objective', 'opportunity', 'plan', 'potential', 'target' and similar expressions are intended to identify such forward-looking statements. Such forward-looking statements involve substantial risks, uncertainties, and assumptions. These statements are based on the current estimates and assumptions of the management of Innoviva as of the date of this press release and are subject to known and unknown risks, uncertainties, changes in circumstances, assumptions and other factors that may cause the actual results of Innoviva to be materially different from those reflected in the forward-looking statements. Important factors that could cause actual results to differ materially from those indicated by such forward-looking statements include, among others, risks related to: expected cost savings; lower than expected future royalty revenue from respiratory products partnered with GSK; the commercialization of RELVAR/BREO ELLIPTA, ANORO ELLIPTA and, formerly, TRELEGY ELLIPTA in the jurisdictions in which these products have been approved; the strategies, plans and objectives of Innoviva (including Innoviva's growth strategy and corporate development initiatives beyond the existing respiratory portfolio); the timing, manner, and amount of potential capital returns to shareholders; the status and timing of clinical studies, data analysis and communication of results; the potential benefits and mechanisms of action of product candidates; expectations for product candidates through development and commercialization; the timing of regulatory approval of product candidates and projections of revenue, expenses and other financial items; the impact of the novel coronavirus (COVID-19). Other risks affecting Innoviva are described under the headings 'Risk Factors' and 'Management's Discussion and Analysis of Financial Condition and Results of Operations' contained in Innoviva's Annual Report on Form 10-K for the year ended December 31, 2022 and Quarterly Reports on Form 10-Q, which are on file with the Securities and Exchange Commission (SEC) and available on the SEC's website at www.sec.gov. Past performance is not necessarily indicative of future results. No forward-looking statements can be guaranteed, and actual results may differ materially from such statements. Given these uncertainties, you should not place undue reliance on these forward-looking statements. The information in this press release is provided only as of the date hereof, and Innoviva assumes no obligation to update its forward-looking statements on account of new information, future events or otherwise, except as required by law.

Contact:

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Email: Innoviva@argotpartners.com

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