RedHill Biopharma Presents New Data from Talicia®’s Phase 3 Studies at ACG 2020 Focused on Achieving Successful First-Line Treatment in H. pylori Eradication

H. pylori eradication rates with clarithromycin-based triple therapy werefound to bepredictably lowin the Phase 3trial,withantibiotic resistanceacontributing factor.Despitedecliningefficacy, physicians are stillprescribing these regimenscounter toACG guidelines,whichadvocatefor usingfirst-lineregimensthatprovidethe highest likelihood of eradication success--Talicia’sefficacyin the Phase 3 studywasunaffected by patientbody mass index (BMI),whilepublished datasuggest that BMI may be associated with the failure of clarithromycin-basedH. pyloritreatments,furthersupporting the use of Talicia as a first-linetherapyinall populations--Talicia isthe first and only FDA-approved rifabutin-based therapy forthetreatment ofH. pyloriinfection,designed as a first-line option to address the highand growingresistance of H. pylorito commonly used antibiotics

TEL AVIV, Israel and RALEIGH, N.C., Oct. 26, 2020 (GLOBE NEWSWIRE) --RedHill Biopharma Ltd.(Nasdaq:RDHL) (“RedHill” or the “Company”), a specialty biopharmaceutical company, today announced that new data supporting the use of Talicia®1as a first-line therapy for eradication ofH. pyloriin adults was presented at the American College of Gastroenterology (ACG) 2020 Virtual Annual Scientific Meeting. The Company also presented data highlighting the emerging patterns ofH.pyloriresistance to antibiotics used in current standard-of-care therapies.

A key objective of the new U.S. Government "National Action Plan for Combating Antibiotic-Resistant Bacteria, 2020-2025"2is lowering the annual rate of inappropriate outpatient antibiotic prescribing. Efficacy of treatments forH. pylori, one of the most prevalent infections in the U.S. and the leading cause of gastric cancer, has been steadily declining due to increasing levels of antibiotic resistance3. In tackling this problem, it is important to ensure successful first-line eradication ofH. pyloriinfection. The analyses presented by RedHill at the ACG annual meeting aim to provide insights that may help avoid the risk of antibiotic resistance in the eradication ofH. pylori.

Poster 1:PersistentH. pyloriinfection following participation in two randomized controlledtrials: Outcomes of patients receiving physician-directed standard-of-care therapy4.This analysis of data from the Talicia Phase 3 studies looked at the cure rates of physician-directed standard-of-care therapy for persistentH. pyloriinfection. The analysis found that eradication rates with empiric clarithromycin-based triple therapy were predictably low, and that despite declining efficacy of clarithromycin-containing therapies, physicians are still prescribing these regimens.

“Despite the ACG treatment guideline recommendations for avoiding clarithromycin-containing triple therapy in patients with prior macrolide use and as salvage treatment, as well as other recommended restrictions based on resistance, clarithromycin-based therapies unfortunately remain an all too often prescribed treatment forH. pylori,”said Dr. Colin W.Howden, MD, AGAF, FACG, Hyman Professor of Medicine & Chief of the Division of Gastroenterology, University of Tennessee Health Science Center.“BecauseH. pyloritreatment is largely empiric, it is important that physicians prescribe a first-line regimen with the highest probability of successful eradication. A treatment regimen that does not contain clarithromycin, such as low dose rifabutin-based therapy, is a good first-line option to consider forH. pylorieradication.”

Poster2:Efficacy ofH.pylorieradication by low-dose rifabutin triple therapy (RHB-105)is unaffected by BMI: Post-hoc analysis from twoPhase 3 trials5.Winner of the ACG “Outstanding Poster Presenter” Award.With rising rates of obesity in the U.S., and published data suggesting that Body Mass Index (BMI) may be associated with the failure of clarithromycin-basedH. pyloritreatments6, it is imperative to study the influence of patient BMI on treatment success. This post-hoc analysis assessed the impact of BMI on eradication rates ofH.pyloriin patients with a BMI of both above and below 40,with results demonstrating that eradication rates with Talicia remained within the same high range, irrespective of patient BMI status. This maintenance of Talicia efficacy compares to an almost 50% reduction of eradication rates in amoxicillin/omeprazole-comparator-treated patients with BMI ≥40.

“Antibiotic treatment failure in obese populations withH. pyloriis a significant concern and may be linked to elevations in BMI,”said Dr. June Almenoff, MD, Ph.D., RedHill’s Chief Scientific Officer. “Given the trends of increasing BMI and growing antibiotic resistance in the U.S., it is critical to work towards first-lineH. pylorieradication success in all patients irrespective of BMI. These data demonstrate that Talicia’s efficacy rates were similarly high across patient sub-groups by BMI.”

About Talicia(omeprazole magnesium, amoxicillin and rifabutin)Talicia is the only rifabutin-based therapy approved for the treatment ofH. pyloriinfection and is designed to address the high resistance ofH. pyloribacteria to commonly used clarithromycin-based therapies. The high rates ofH. pyloriresistance to clarithromycin have led to significant rates of treatment failure with clarithromycin-based therapy and are a strong public health concern, as highlighted by the FDA and the World Health Organization (WHO) in recent years.Talicia is a novel, fixed-dose, all-in-one oral capsule combination of two antibiotics (amoxicillin and rifabutin) and a proton pump inhibitor (PPI) (omeprazole). In November 2019, Talicia was approved by the U.S. FDA for the treatment ofH. pyloriinfection in adults. In the pivotal Phase 3 study, Talicia demonstrated 84% eradication ofH. pyloriinfection in the intent-to-treat (ITT) group vs. 58% in the active comparator arm (p<0.0001). Minimal to zero resistance to rifabutin, a key component of Talicia, was detected in RedHill’s pivotal Phase 3 study. Further, in an analysis of data from this study, it was observed that subjects who were confirmed adherent7to their therapy had eradication rates of 90.3% in the Talicia arm vs. 64.7% in the active comparator arm8.Talicia is eligible for a total of eight years of U.S. market exclusivity under its Qualified Infectious Disease Product (QIDP) designation and is also covered by U.S. patents which extend patent protection until 2034 with additional patents and applications pending and granted in various territories worldwide.AboutH. pyloriH. pylori is a bacterial infection that affects approximately 35%9of the U.S. population, with an estimated two million patients treated annually10. Worldwide, more than 50% of the population hasH. pyloriinfection, which is classified by the WHO as a Group 1 carcinogen. It remains the strongest known risk factor for gastric cancer11and a major risk factor for peptic ulcer disease12and gastric mucosa-associated lymphoid tissue (MALT) lymphoma13. More than 27,000 Americans are diagnosed with gastric cancer annually14. Eradication of H. pylori is becoming increasingly difficult, with current therapies failing in approximately 25-40% of patients who remain H. pylori-positive due to high resistance of H. pylori to antibiotics commonly used in standard combination therapies15.

About RedHill BiopharmaRedHill Biopharma Ltd. (Nasdaq:RDHL) is a specialty biopharmaceutical company primarily focused on gastrointestinal and infectious diseases. RedHill promotes the gastrointestinal drugs,Movantik®for opioid-induced constipation in adults with non-cancer pain16,Talicia®for the treatment ofHelicobacter pylori (H. pylori)infection in adults17, andAemcolo®for the treatment of travelers’ diarrhea in adults18. RedHill’s key clinical late-stage investigational development programs include: (i)RHB-204, with a planned Phase 3 study for pulmonary nontuberculous mycobacteria (NTM) infections; (ii)opaganib (Yeliva®), a first-in-class SK2 selective inhibitor targeting multiple indications with a Phase 2/3 program for COVID-19 and Phase 2 studies for prostate cancer and cholangiocarcinoma ongoing; (iii)RHB-104, with positive results from a first Phase 3 study for Crohn's disease; (iv)RHB-102(Bekinda®), with positive results from a Phase 3 study for acute gastroenteritis and gastritis and positive results from a Phase 2 study for IBS-D; (v)RHB-107, a Phase 2-stage first-in-class, serine protease inhibitor, targeting cancer and inflammatory gastrointestinal diseases and is also being evaluated for COVID-19 and (vi)RHB-106, an encapsulated bowel preparation. More information about the Company is available atwww.redhillbio.com.TALICIA:INDICATION AND USAGETalicia is a three-drug combination of omeprazole, a proton pump inhibitor, amoxicillin, a penicillin-class antibacterial, and rifabutin, a rifamycin antibacterial, indicated for the treatment ofHelicobacter pyloriinfection in adults.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Talicia and other antibacterial drugs, Talicia should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.

IMPORTANT SAFETY INFORMATIONTalicia contains omeprazole, a proton pump inhibitor (PPI), amoxicillin, a penicillin-class antibacterial and rifabutin, a rifamycin antibacterial. It is contraindicated in patients with known hypersensitivity to any of these medications, any other components of the formulation, any other beta-lactams or any other rifamycin.

Talicia is contraindicated in patients receiving rilpivirine-containing products.

Talicia is contraindicated in patients receiving delavirdine or voriconazole.

Serious and occasionally fatal hypersensitivity reactions have been reported with omeprazole, amoxicillin and rifabutin.

Clostridioidesdifficile-associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents and may range from mild diarrhea to fatal colitis. Talicia may cause fetal harm. Talicia is not recommended for use in pregnancy.

Talicia may reduce the efficacy of hormonal contraceptives. An additional non-hormonal method of contraception is recommended when taking Talicia.

Talicia should not be used in patients with hepatic impairment or severe renal impairment.

Acute Interstitial Nephritis has been observed in patients taking PPIs and penicillins.

Cutaneous lupus erythematosus (CLE) and systemic lupus erythematosus (SLE) have been reported in patients taking PPIs. These events have occurred as both new onset and exacerbation of existing autoimmune disease.

The most common adverse reactions (≥1%) were diarrhea, headache, nausea, abdominal pain, chromaturia, rash, dyspepsia, oropharyngeal pain, vomiting, and vulvovaginal candidiasis.

To report SUSPECTED ADVERSE REACTIONS, contact RedHill Biopharma INC. at 1-833-ADRHILL (1-833-237-4455) or FDA at 1-800-FDA-1088 orwww.fda.gov/medwatch.

Full prescribing information for Talicia is available atwww.Talicia.com

This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements may be preceded by the words “intends,” “may,” “will,” “plans,” “expects,” “anticipates,” “projects,” “predicts,” “estimates,” “aims,” “believes,” “hopes,” “potential” or similar words. Forward-looking statements are based on certain assumptions and are subject to various known and unknown risks and uncertainties, many of which are beyond the Company’s control and cannot be predicted or quantified,and consequently, actual results may differ materially from those expressed or implied by such forward-looking statements. Such risks and uncertainties associated with (i) the initiation, timing, progress and results of the Company’s research, manufacturing, pre-clinical studies, clinical trials, and other therapeutic candidate development efforts, and the timing of the commercial launch of its commercial products and ones it may acquire or develop in the future; (ii) the Company’s ability to advance its therapeutic candidates into clinical trials or to successfully complete its pre-clinical studies or clinical trialsor the development of a commercial companion diagnostic for the detection of MAP; (iii) the extent and numberand typeof additional studies that the Company may be required to conduct and the Company’s receipt of regulatory approvals for its therapeutic candidates, and the timing of other regulatory filings, approvals and feedback; (iv) the manufacturing, clinical development, commercialization, and market acceptance of the Company’s therapeutic candidatesandcommercial products; (v) the Company’s ability to successfullycommercialize and promoteTalicia®,and Aemcolo®and Movantik®; (vi) the Company’s ability to establish and maintain corporate collaborations; (vii) the Company's ability to acquire products approved for marketing in the U.S. that achieve commercial success and build its own marketing and commercialization capabilities; (viii) the interpretation of the properties and characteristics of the Company’s therapeutic candidates and the results obtained with its therapeutic candidates in research, pre-clinical studies or clinical trials; (ix) the implementation of the Company’s business model, strategic plans for its business and therapeutic candidates; (x) the scope of protection the Company is able to establish and maintain for intellectual property rights covering its therapeutic candidatesand commercial productsand its ability to operate its business without infringing the intellectual property rights of others; (xi) parties from whom the Company licenses its intellectual property defaulting in their obligations to the Company; (xii) estimates of the Company’s expenses, future revenues,capital requirements and needs for additional financing; (xiii)theeffect of patients suffering adverse experiences using investigative drugs under theCompany's Expanded AccessProgram; (xiv)competition from othercompanies and technologies within the Company’s industry; and (xv) the hiringand maintaining employment of executive managers. More detailed information about the Company and the risk factors that may affect the realization of forward-looking statements is set forth in the Company's filings with the Securities and Exchange Commission (SEC), including the Company's Annual Report on Form 20-F filed with the SEConMarch4,2020. All forward-looking statements included in thispressrelease are made only as of the date of thispressrelease.TheCompanyassumesno obligation to update any written or oral forward-looking statement, whetheras a result ofnew information, future events orotherwiseunless required by law.

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1Omeprazole magnesium, amoxicillin and rifabutin delayed release capsules. Also referred to as RHB-1052https://aspe.hhs.gov/pdf-report/carb-plan-2020-20253Prevalence of Antibiotic Resistance inHelicobacter pylori: A Systematic Review and Meta-analysis in World HealthOrganization Regions. Alessia Savoldi et al. Gastroenterology 2018;155:1372–1382.4PersistentH. pyloriinfection following participation in two randomized controlled trials: Outcomes of patients receiving physician-directed standard-of-care therapy. Colin W. Howden, Raymond M. Panas, June S. Almenoff, and Willian D. Chey.5Efficacy ofH. pylorieradication by low-dose rifabutin triple therapy (rhb-105) is unaffected by BMI: Post-hoc analysis from two Phase 3 trials. Kely L. Sheldon, Steven F. Moss, Mohd Amer Alsamman, Elliot Offman, Raymond M. Panas, and June S. Almenoff.6Cerqueira, R. M., Correia, M. R., Fernandes, C. D., et al. (2013). CumulativeHelicobacter pylorieradication therapy in obese patients undergoing gastric bypass surgery. Obes Surg, 23(2), 145-149. doi:10.1007/s11695-012-0747-4.7Defined as the PK population which included those subjects in the ITT population who had demonstrated presence of any component of investigational drug at visit 3 (approx. day 13) or had undetected levels drawn >250 hours after the last dose.8The pivotal Phase 3 study with Talicia®demonstrated 84% eradication ofH. pyloriinfection with Talicia®vs. 58% in the active comparator arm (ITT analysis, p<0.0001).9Hooi JKY et al. Global Prevalence ofHelicobacter pyloriInfection: Systematic Review and Meta-Analysis. Gastroenterology 2017; 153:420-429.10IQVIA Custom Study for RedHill Biopharma, 201911Lamb A et al. Role of theHelicobacter pylori‐Induced inflammatory response in the development of gastric cancer. J Cell Biochem 2013;114.3:491-497.12NIH –Helicobacter pyloriand Cancer, September 2013.13Hu Q et al. Gastric mucosa-associated lymphoid tissue lymphoma andHelicobacter pyloriinfection: a review of current diagnosis and management. Biomarker research 2016;4.1:15.14National Cancer Institute, Surveillance, Epidemiology, and End Results Program (SEER).15Malfertheiner P. et al. Management ofHelicobacter pyloriinfection - the Maastricht IV/ Florence Consensus Report, Gut 2012;61:646-664; O’Connor A. et al. Treatment ofHelicobacter pyloriInfection 2015, Helicobacter 20 (S1) 54-61; Venerito M. et al. Meta-analysis of bismuth quadruple therapy versus clarithromycin triple therapy for empiric primary treatment ofHelicobacter pyloriinfection. Digestion 2013;88(1):33-45.16Full prescribing information for Movantik®(naloxegol) is available at:www.Movantik.com.17Full prescribing information for Talicia®(omeprazole magnesium, amoxicillin and rifabutin) is available at:www.Talicia.com.18Full prescribing information for Aemcolo®(rifamycin) is available at:www.Aemcolo.com.