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    Merck to Present New Data Highlighting Research Advancements Across its HIV Prevention and Treatment Pipeline at IAS 2025

    7/8/25 6:45:00 AM ET
    $MRK
    Biotechnology: Pharmaceutical Preparations
    Health Care
    Get the next $MRK alert in real time by email

    Merck (NYSE:MRK), known as MSD outside of the United States and Canada, announced today that new data from its research pipeline for HIV prevention and treatment will be presented at the 13th International AIDS Society Conference on HIV Science (IAS 2025) taking place July 13-17, 2025, in Kigali, Rwanda.

    Merck will share new scientific findings from its HIV clinical development programs, including Phase 2 data on the safety and pharmacokinetics of MK-8527, an investigational, novel nucleoside reverse transcriptase translocation inhibitor (NRTTI), dosed orally once monthly, in development for the prevention of HIV as pre-exposure prophylaxis (PrEP).

    HIV clinical data presented at IAS 2025 from three Phase 3 trials (P051: NCT05631093; P052: NCT05630755; P054: NCT05766501) will examine the impact of preexisting resistance-associated mutations (RAMs) in proviral DNA on the virologic response to doravirine/islatravir (DOR/ISL), with a primary focus on M184I/V in proviral DNA.

    Data will also be presented on the clinical development program for a once-weekly oral combination of islatravir and ulonivirine (ISL/ULO) for the treatment of adults with HIV-1 infection. Data from two Phase 1 trials evaluating the safety and tolerability of weekly ulonivirine and drug interactions between islatravir and ulonivirine dosed weekly in adults without HIV and a Phase 2b dose-ranging study utilizing a higher (20mg) dose of islatravir and 3 doses of ulonivirine in treatment naive adults living with HIV-1 will be presented. Based on results from these trials and pharmacokinetic modeling that will also be presented, a once-weekly oral combination of islatravir (2mg) and ulonivirine (200mg) (MK-8591B) is moving forward in clinical development.

    "As we continue to advance our HIV research, we are excited to present data from across our HIV pipeline at IAS 2025, including new data from our nucleoside reverse transcriptase translocation inhibitors development programs," said Dr. Elizabeth Rhee, vice president, global clinical development, Merck Research Laboratories. "With daily, weekly and monthly oral regimens in development, we aim to offer choices that can help address the evolving needs of individuals living with or impacted by HIV."

    Select abstracts in the IAS 2025 program include:

    Abstract Title and Author

    Date

    HIV PREVENTION

    Safety and Pharmacokinetics of Once-Monthly MK-8527: a Phase 2 Study in Adults at Low Risk of HIV-1 Exposure, Mayer, K, et al.

    Late-Breaker

    Oral Presentation

    Wednesday, July 16, 2025

    (15:00 – 16:00 CAT)

    HIV TREATMENT

    Switching to Doravirine/Islatravir (100mg/0.25mg) Once Daily Maintained Viral Suppression in the Presence of Archived M184I/V Resistance-Associated Mutations in Proviral DNA, Diamond, T, et al.

    Poster Session

    Wednesday, July 16, 2025

    (12:15 – 13:15 CAT)

     

    A Double-Blind, Active-Controlled, Phase 2b Study to Evaluate the Efficacy and Safety of Ulonivirine in Combination with Islatravir in Virologically Suppressed Adults Living With HIV-1, Molina, J.M., et al. (*)

    Oral Presentation

    ART Strategies

    Tuesday, July 15, 2025 (10:45 – 11:45 CAT)

    A Double-Blind Placebo-Controlled, Phase 1 Study to Evaluate Extended Multiple Dosing of Ulonivirine (MK-8507) in Adults Without HIV, Nussbaum, J, et al.

    Virtual Poster

     

    An Open-Label Phase 1 Study to Evaluate Drug Interactions Between Multiple Weekly Doses of Ulonivirine (MK-8507) and Single Doses of Islatravir in Adults Without HIV, Nussbaum, J, et al.

    Virtual Poster

     

    Phase 2 Once-Weekly Dose Optimization for Ulonivirine (MK-8507) in Combination with Islatravir (2mg), Pham, M, et al.

    Virtual Poster

    (*) Previous ulonivirine development program utilizing a higher (20mg) dose of islatravir.

    This year at IAS, Merck will host a policy symposium "Harnessing the Private Sector to Deliver HIV Prevention" on Tuesday, July 15, from 18:00 – 19:30 CAT. Merck will also host a medical symposium "Let's Talk About It – Practical Case Discussions" on Wednesday, July 16, from 12:15 – 13:15 CAT, which will cover critical considerations when treating HIV today, as well as a deep dive into the DOR/ISL resistance profile based on Phase 3 data. Both events will be open to all registered attendees, virtually and in-person.

    Separately, Merck will be hosting a virtual investor event where scientific and commercial leaders will give an overview of the company's advancing research pipeline in HIV treatment and prevention on Thursday, July 17, at 9:00AM ET. Investors, analysts, members of the media, and the general public are invited to listen to a webcast of the presentation at this weblink.

    For more details about Merck's clinical development program in HIV treatment and prevention, click here.

    Merck's Commitment to HIV

    For more than 35 years, Merck has been committed to scientific research and discovery in HIV leading to scientific breakthroughs that have helped change HIV treatment. Our work has helped pioneer the development of new options across multiple drug classes to help those impacted by HIV. Today, we are developing a series of antiviral options designed to help people manage their HIV and to help prevent HIV, with the goal of reducing the growing burden of infection worldwide. We want to ensure people are not defined by HIV, and our work focuses on transformational innovations, collaborations with others in the global HIV community, and access initiatives aimed at helping to end the HIV epidemic for everyone.

    Indications and usage for PIFELTRO® (doravirine) and DELSTRIGO® (doravirine, lamivudine, and tenofovir disoproxil fumarate) in the U.S.

    PIFELTRO is indicated in combination with other antiretroviral (ARV) agents for the treatment of HIV-1 infection in adult patients with no prior ARV treatment history or to replace the current ARV regimen in those who are virologically suppressed (HIV-1 RNA less than 50 copies per mL) on a stable ARV regimen with no history of treatment failure and no known substitutions associated with resistance to doravirine.

    DELSTRIGO is indicated as a complete regimen for the treatment of HIV-1 infection in adult patients with no prior ARV treatment history or to replace the current ARV regimen in those who are virologically suppressed (HIV-1 RNA less than 50 copies per mL) on a stable ARV regimen with no history of treatment failure and no known substitutions associated with resistance to the individual components of DELSTRIGO.

    Selected Safety Information

    Warning: Posttreatment Acute Exacerbation of Hepatitis B Virus (HBV) for DELSTRIGO

    All patients with HIV-1 should be tested for the presence of HBV before initiating ARV therapy. Severe acute exacerbations of HBV have been reported in people with concomitant HIV-1 and HBV who have discontinued products containing lamivudine or tenofovir disoproxil fumarate (TDF), which are components of DELSTRIGO. Patients coinfected with HIV-1 and HBV who discontinue DELSTRIGO should be monitored with both clinical and laboratory follow-up for at least several months after stopping DELSTRIGO. If appropriate, initiation of anti-HBV therapy may be warranted.

    Contraindications

    PIFELTRO and DELSTRIGO are contraindicated when coadministered with drugs that are strong cytochrome P450 (CYP)3A enzyme inducers (including the anticonvulsants carbamazepine, oxcarbazepine, phenobarbital, and phenytoin; the androgen receptor inhibitor enzalutamide; the antimycobacterials rifampin and rifapentine; the cytotoxic agent mitotane; and the herbal product St. John's wort (Hypericum perforatum)), as significant decreases in doravirine plasma concentrations may occur, which may decrease the effectiveness of DELSTRIGO and PIFELTRO.

    DELSTRIGO is contraindicated in patients with a previous hypersensitivity reaction to lamivudine.

    Warnings and Precautions

    Severe Skin Reactions

    Severe skin reactions, including Stevens-Johnson syndrome (SJS)/toxic epidermal necrolysis (TEN), have been reported during the postmarketing experience with doravirine-containing regimens. Discontinue PIFELTRO or DELSTRIGO, and other medications known to be associated with severe skin reactions, immediately if a painful rash with mucosal involvement or a progressive severe rash develops. Clinical status should be closely monitored, and appropriate therapy should be initiated.

    New or Worsening Renal Impairment

    Renal impairment, including cases of acute renal failure and Fanconi syndrome, have been reported with the use of TDF. DELSTRIGO should be avoided with concurrent or recent use of a nephrotoxic agent (eg, high-dose or multiple NSAIDs). Cases of acute renal failure after initiation of high-dose or multiple NSAIDs have been reported in people living with HIV with risk factors for renal dysfunction who appeared stable on TDF.

    Prior to or when initiating DELSTRIGO, and during treatment, assess serum creatinine, estimated creatinine clearance, urine glucose, and urine protein in all patients. In patients with chronic kidney disease, also assess serum phosphorus. Discontinue DELSTRIGO in patients who develop clinically significant decreases in renal function or evidence of Fanconi syndrome. Discontinue DELSTRIGO if estimated creatinine clearance declines below 50 mL/min.

    Bone Loss and Mineralization Defects

    In clinical trials in adults living with HIV, TDF was associated with slightly greater decreases in bone mineral density (BMD) and increases in biochemical markers of bone metabolism. Serum parathyroid hormone levels and 1,25 Vitamin D levels were also higher. Cases of osteomalacia associated with proximal renal tubulopathy have been reported with the use of TDF. The effects of TDF-associated changes in BMD and biochemical markers on long-term bone health and future fracture risk in adults are unknown.

    Immune Reconstitution Syndrome

    Immune reconstitution syndrome can occur, including the occurrence of autoimmune disorders with variable time to onset, which may necessitate further evaluation and treatment.

    Drug Interactions

    Because DELSTRIGO is a complete regimen, coadministration with other antiretroviral medications for the treatment of HIV-1 infection is not recommended.

    Coadministration of PIFELTRO with efavirenz, etravirine, or nevirapine is not recommended.

    If DELSTRIGO is coadministered with rifabutin, take one tablet of DELSTRIGO once daily, followed by one tablet of doravirine (PIFELTRO) approximately 12 hours after the dose of DELSTRIGO.

    If PIFELTRO is coadministered with rifabutin, increase PIFELTRO dosage to one tablet twice daily (approximately 12 hours apart).

    Consult the full Prescribing Information prior to and during treatment for more information on potential drug-drug interactions.

    Dosage and Administration/Specific Populations

    Renal Impairment

    Because DELSTRIGO is a fixed-dose combination tablet and the dosage of lamivudine and TDF cannot be adjusted, DELSTRIGO is not recommended in patients with estimated creatinine clearance less than 50 mL/min.

    Adverse Reactions

    The most common adverse reactions with DELSTRIGO (incidence ≥5%, all intensities) were dizziness (7%), nausea (5%), and abnormal dreams (5%). The most common adverse reactions with PIFELTRO (incidence ≥5%, all intensities) were nausea (7%), dizziness (7%), headache (6%), fatigue (6%), diarrhea (6%), abdominal pain (5%), and abnormal dreams (5%).

    By week 96 in DRIVE-FORWARD, 2% of adult participants in the PIFELTRO group and 3% in the darunavir+ritonavir (DRV+r) group had adverse events leading to discontinuation of study medication.

    By week 96 in DRIVE-AHEAD, 3% of adult participants in the DELSTRIGO group and 7% in the efavirenz (EFV)/emtricitabine (FTC)/TDF group had adverse events leading to discontinuation of study medication.

    In DRIVE-FORWARD, mean changes from baseline at week 48 in LDL-cholesterol (LDL-C) and non-HDL-cholesterol (non-HDL-C) were pre-specified. LDL-C: -4.6 mg/dL in the PIFELTRO group vs 9.5 mg/dL in the DRV+r group. Non-HDL-C: -5.4 mg/dL in the PIFELTRO group vs 13.7 mg/dL in the DRV+r group. The clinical benefits of these findings have not been demonstrated.

    In DRIVE-AHEAD, mean changes from baseline at week 48 in LDL-C and non-HDL-C were pre-specified. LDL-C: -2.1 mg/dL in the DELSTRIGO group vs 8.3 mg/dL in the EFV/FTC/TDF group. Non-HDL-C: -4.1 mg/dL in the DELSTRIGO group vs 12.7 mg/dL in the EFV/FTC/TDF group. The clinical benefits of these findings have not been demonstrated.

    In DRIVE-SHIFT, mean changes from baseline at week 24 in LDL-C and non-HDL-C were pre-specified. LDL-C: -16.3 mg/dL in the DELSTRIGO group vs -2.6 mg/dL in the PI + ritonavir group. Non-HDL-C: -24.8 mg/dL in the DELSTRIGO group vs -2.1 mg/dL in the PI + ritonavir group. The clinical benefits of these findings have not been demonstrated.

    In DRIVE-AHEAD, neuropsychiatric adverse events were reported in the three pre-specified categories of sleep disorders and disturbances, dizziness, and altered sensorium. Twelve percent of adult participants in the DELSTRIGO group and 26% in the EFV/FTC/TDF group reported neuropsychiatric adverse events of sleep disorders and disturbances; 9% in the DELSTRIGO group and 37% in the EFV/FTC/TDF group reported dizziness; and 4% in the DELSTRIGO group and 8% in the EFV/FTC/TDF group reported altered sensorium.

    The safety of DELSTRIGO in virologically-suppressed adults was based on week 48 data from participants in the DRIVE-SHIFT trial. Overall, the safety profile in virologically-suppressed adult participants was similar to that in participants with no ARV treatment history.

    Serum ALT and AST Elevations: In the DRIVE-SHIFT trial, 22% and 16% of participants in the immediate switch group experienced ALT and AST elevations greater than 1.25 X ULN, respectively, through 48 weeks on DELSTRIGO. For these ALT and AST elevations, no apparent patterns with regard to time to onset relative to switch were observed. One percent of participants had ALT or AST elevations greater than 5 X ULN through 48 weeks on DELSTRIGO. The ALT and AST elevations were generally asymptomatic, and not associated with bilirubin elevations. In comparison, 4% and 4% of participants in the delayed switch group experienced ALT and AST elevations of greater than 1.25 X ULN through 24 weeks on their baseline regimen.

    Pregnancy/Breastfeeding

    There is a pregnancy exposure registry that monitors pregnancy outcomes in individuals exposed to PIFELTRO or DELSTRIGO during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1-800-258-4263.

    Inform individuals with HIV-1 infection of the potential risks of breastfeeding, including: (1) HIV-1 transmission (in HIV-1–negative infants), (2) developing viral resistance (in HIV-1–positive infants), and (3) serious adverse reactions in a breastfed infant similar to those seen in adults.

    About Merck

    At Merck, known as MSD outside of the United States and Canada, we are unified around our purpose: We use the power of leading-edge science to save and improve lives around the world. For more than 130 years, we have brought hope to humanity through the development of important medicines and vaccines. We aspire to be the premier research-intensive biopharmaceutical company in the world – and today, we are at the forefront of research to deliver innovative health solutions that advance the prevention and treatment of diseases in people and animals. We foster a diverse and inclusive global workforce and operate responsibly every day to enable a safe, sustainable and healthy future for all people and communities. For more information, visit www.merck.com and connect with us on X (formerly Twitter), Facebook, Instagram, YouTube and LinkedIn.

    Forward-Looking Statement of Merck & Co., Inc., Rahway, N.J., USA

    This news release of Merck & Co., Inc., Rahway, N.J., USA (the "company") includes "forward-looking statements" within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. These statements are based upon the current beliefs and expectations of the company's management and are subject to significant risks and uncertainties. There can be no guarantees with respect to pipeline candidates that the candidates will receive the necessary regulatory approvals or that they will prove to be commercially successful. If underlying assumptions prove inaccurate or risks or uncertainties materialize, actual results may differ materially from those set forth in the forward-looking statements.

    Risks and uncertainties include but are not limited to, general industry conditions and competition; general economic factors, including interest rate and currency exchange rate fluctuations; the impact of pharmaceutical industry regulation and health care legislation in the United States and internationally; global trends toward health care cost containment; technological advances, new products and patents attained by competitors; challenges inherent in new product development, including obtaining regulatory approval; the company's ability to accurately predict future market conditions; manufacturing difficulties or delays; financial instability of international economies and sovereign risk; dependence on the effectiveness of the company's patents and other protections for innovative products; and the exposure to litigation, including patent litigation, and/or regulatory actions.

    The company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. Additional factors that could cause results to differ materially from those described in the forward-looking statements can be found in the company's Annual Report on Form 10-K for the year ended December 31, 2024 and the company's other filings with the Securities and Exchange Commission (SEC) available at the SEC's Internet site (www.sec.gov).

    Please see Prescribing Information for PIFELTRO (doravirine) at: https://www.merck.com/product/usa/pi_circulars/p/pifeltro/pifeltro_pi.pdf and Patient Information for PIFELTRO at: https://www.merck.com/product/usa/pi_circulars/p/pifeltro/pifeltro_ppi.pdf

    Please see Prescribing Information for DELSTRIGO (doravirine, lamivudine, and tenofovir disoproxil fumarate) at: https://www.merck.com/product/usa/pi_circulars/d/delstrigo/delstrigo_pi.pdf and Patient Information for DELSTRIGO at: https://www.merck.com/product/usa/pi_circulars/d/delstrigo/delstrigo_ppi.pdf

    View source version on businesswire.com: https://www.businesswire.com/news/home/20250708840589/en/

    Media Contacts:

    Julie Cunningham, (617) 519-6264

    Deb Wambold, (215) 779-2234



    Investor Contacts:

    Peter Dannenbaum, (732) 594-1579

    Steven Graziano, (732) 594-1583

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      Merck (NYSE:MRK), known as MSD outside of the United States and Canada, will hold its second-quarter 2025 sales and earnings conference call with institutional investors and analysts at 9:00 a.m. ET on Tuesday, July 29. During the call, company executives will provide an overview of Merck's performance for the quarter. Investors, journalists and the general public may access a live audio webcast of the call via this weblink. A replay of the webcast, along with the sales and earnings news release, supplemental financial disclosures and slides highlighting the results, will be available at www.merck.com. All participants may join the call by dialing (800) 369-3351 (U.S. and Canada Toll-Fr

      7/1/25 6:45:00 AM ET
      $MRK
      Biotechnology: Pharmaceutical Preparations
      Health Care
    • Merck Announces Third-Quarter 2025 Dividend

      Merck (NYSE:MRK), known as MSD outside of the United States and Canada, announced today that the Board of Directors has declared a quarterly dividend of $0.81 per share of the company's common stock for the third quarter of 2025. Payment will be made on July 8, 2025, to shareholders of record at the close of business on June 16, 2025. About Merck At Merck, known as MSD outside of the United States and Canada, we are unified around our purpose: We use the power of leading-edge science to save and improve lives around the world. For more than 130 years, we have brought hope to humanity through the development of important medicines and vaccines. We aspire to be the premier research-intens

      5/27/25 1:24:00 PM ET
      $MRK
      Biotechnology: Pharmaceutical Preparations
      Health Care
    • Merck Announces First-Quarter 2025 Financial Results

      Total Worldwide Sales Were $15.5 Billion, a Decrease of 2% From First Quarter 2024; Excluding the Impact of Foreign Exchange, Sales Grew 1% KEYTRUDA Sales Grew 4% to $7.2 Billion; Excluding the Impact of Foreign Exchange, Sales Grew 6% WINREVAIR Sales Were $280 Million Animal Health Sales Grew 5% to $1.6 Billion; Excluding the Impact of Foreign Exchange, Sales Grew 10% GARDASIL/GARDASIL 9 Sales Declined 41% to $1.3 Billion; Excluding the Impact of Foreign Exchange, Sales Declined 40% GAAP EPS Was $2.01; Non-GAAP EPS Was $2.22 Presented Compelling Data From a Diverse Range of Programs, Including: Phase 3 Trial of Subcutaneous Pembrolizumab With Berahyaluronidase Alfa Phase

      4/24/25 6:30:00 AM ET
      $MRK
      Biotechnology: Pharmaceutical Preparations
      Health Care

    $MRK
    Large Ownership Changes

    This live feed shows all institutional transactions in real time.

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    • SEC Form SC 13G/A filed by Merck & Company Inc. (Amendment)

      SC 13G/A - Merck & Co., Inc. (0000310158) (Subject)

      2/13/24 4:55:49 PM ET
      $MRK
      Biotechnology: Pharmaceutical Preparations
      Health Care
    • SEC Form SC 13G/A filed by Merck & Company Inc. (Amendment)

      SC 13G/A - Merck & Co., Inc. (0000310158) (Subject)

      2/9/23 10:54:48 AM ET
      $MRK
      Biotechnology: Pharmaceutical Preparations
      Health Care
    • SEC Form SC 13G/A filed by Merck & Company Inc. (Amendment)

      SC 13G/A - Merck & Co., Inc. (0000310158) (Subject)

      2/9/22 3:15:54 PM ET
      $MRK
      Biotechnology: Pharmaceutical Preparations
      Health Care