A Randomized Study of Andexanet Alfa Compared to Usual Care in Patients Receiving a Factor Xa Inhibitor Who Require Urgent Surgery or Procedure (ANNEXA-RS)

The study will aim to find out if the drug andexanet alfa is safe and effective in preventing major bleeding during urgent surgery or invasive procedures. The study will compare the use of andexanet alfa to the usual care given at the study center.

Start Date02 Aug 2024

Sponsor / Collaborator

AstraZeneca PLC

NCT05898412

/ RecruitingNot Applicable

Retrospective Real World Evidence Study to Describe Characteristics and Outcomes in Dutch Patients Admitted to the Hospital With a Factor Xa Inhibitor-associated Bleeding Treated With Andexanet Alfa

This is an observational retrospective database study of hospitalized patients treated with andexanet alfa in approximately 10 Dutch hospitals. Currently there is limited information on the patient characteristics and outcomes of patients who are treated with andexanet alfa in The Netherlands and how it is used. This is of interest for treating clinicians because there is a need for a patient profile, also due to the on par position of andexanet alfa with PCC in the Dutch national guideline.
Analysis of the data showed that 14 patients of the 218 patients included in the study (6.4%) experienced a thrombotic event (TE) within 30 days after treatment with andexanet alfa. The protocol was amended to allow for an in depth analysis of the 14 TE cases.

Start Date06 Oct 2023

Sponsor / Collaborator

AstraZeneca PLC

NCT05548777

/ CompletedNot Applicable

Andexanet Alfa and 4F-PCC Use in Patients Hospitalised With an Anticoagulant-related Major Bleed

This is an observational study based on data collected via an audit of electronic medical charts. The study population will include adult US patients treated with andexanet alfa or 4F-PCC during a hospitalization for an anticoagulation-related major bleed, and their characteristics, treatments and outcomes will be described.

Start Date15 Sep 2022

Sponsor / Collaborator

AstraZeneca PLC

100 Clinical Results associated with Andexanet alfa

100 Translational Medicine associated with Andexanet alfa

100 Patents (Medical) associated with Andexanet alfa

433

Literatures (Medical) associated with Andexanet alfa

01 Jun 2025·ANNALS OF PHARMACOTHERAPY

Incidence of Venous Thromboembolism Post-Oral Anticoagulation Reversal in Intracranial Hemorrhage Patients

Article

Author: Abdulla, Aliya ; Hall, Courtney ; Morton, Celia ; Culver, Lauren G. ; Donahue, Kevin R.

Background::

Rates of in-hospital venous thromboembolism (VTE) in the intracranial hemorrhage (ICH) population post oral anticoagulation (AC) reversal are as high as 10%. Guidelines recommend the initiation of prophylactic AC 24 to 48 hours post ICH; however, there is no guidance regarding optimal VTE prophylaxis post-reversal.

Objective::

This study aimed to identify the incidence of thromboembolism post oral AC reversal in patients presenting with ICH and describe VTE prophylaxis timing and agent selection.

Methods::

This was a retrospective, descriptive study conducted within a single health system. Patients on AC who received reversal agents 4-factor prothrombin complex concentrate (4F-PCC) with or without vitamin K, andexanet alfa, and/or idarucizumab for AC-associated ICH were included. The primary endpoint was incidence of in-hospital VTE post-reversal. Secondary endpoints included AC utilization specifications, length of stay, and in-hospital mortality.

Results::

There were 118 patients (57%) who received 4F-PCC and 89 patients (43%) who received andexanet alfa for reversal post-ICH. Overall, 195 patients (94.2%) achieved hemostasis. Eight patients had incidence of VTE (3.9%), and of those, 6 patients (75%) were reinitiated on AC, all of which utilized prophylactic heparin. The median time from reversal to VTE was 55.9 days (interquartile range [IQR] = 21.2-72.4). For all patients on AC, the median time to initiation from reversal was 3.98 days (IQR = 2.5-6.01), and for those with incidence of thrombosis, the median time to AC initiation was 6.4 days (IQR = 2.6-13.1). Mortality occurred in 13 patients (6.3%).

Conclusion and Relevance::

This patient population is complex in that the need to achieve hemostasis with AC reversal must be balanced with the risk of VTE. Further studies are needed to determine the ideal timing and agent selection for VTE prophylaxis initiation post ICH reversal.

01 Jun 2025·Medizinische Klinik-Intensivmedizin und Notfallmedizin

Review

Author: Naendrup, Jan-Hendrik ; Sieg, Noëlle ; Eichenauer, Dennis A ; Caspers, Michael ; Kochanek, Matthias ; Neumann, Marie Anne-Catherine ; Böll, Boris ; Garcia Borrega, Jorge ; Shimabukuro-Vornhagen, Alexander ; Hüser, Christoph

BACKGROUND:

Direct oral anticoagulants (DOAC) are increasingly used for prophylaxis and treatment of thromboembolic events. Incorrectly dosed DOAC treatment is associated with excess mortality.

PURPOSE:

This article aims at raising awareness of DOAC overdosing and its causes as well as presenting a diagnostic and therapeutic work-up.

MATERIAL AND METHODS:

Based on a case presentation, a structured review of the current literature on DOAC overdosing was performed and treatment recommendations were extracted.

RESULTS:

In addition to wittingly or unwittingly increased DOAC intake, common causes of overdose are inadequate dose adjustment for concomitant medication or comorbidities. Global coagulation testing should be supplemented with DOAC-specific testing. Severe bleeding and the need for invasive diagnostics or urgent surgery represent indications for treating DOAC overdoses. Based on the cause of an DOAC overdose, active charcoal, endoscopic pill rescue, antagonization with idarucizumab or andexanet alfa and the targeted substitution of coagulation factors represent treatment options.

CONCLUSION:

The sensitization of clinicians is important to ensure a timely diagnosis and adequate treatment of DOAC overdosing. This report provides an overview of current knowledge on diagnostics and treatment; however, further studies are necessary to improve the existing algorithms.

31 May 2025·INTERNAL MEDICINE JOURNAL

2025 Guidelines for direct oral anticoagulants: a practical guidance on the prescription, laboratory testing, peri-operative and bleeding management.

Article

Author: Tran, Huyen A ; Merriman, Eileen ; Young, Laura ; Baker, Ross ; Chunilal, Sanjeev D ; McRae, Simon ; Tan, Chee Wee ; Curnow, Jennifer

Direct oral anticoagulants (DOACs) are widely prescribed to prevent and treat venous and arterial thromboembolism, supported by published evidence, and are preferred over warfarin in many guidelines. Although the risk of major bleeding, in particular intracranial haemorrhage (ICH), is decreased with DOACs, gastrointestinal bleeding is increased with some DOACs, and the case fatality rate of bleeding remains high. Therefore, it is important to (i) prescribe DOACs appropriately, (ii) have strategies to manage major bleeding including the use of specific reversal agents and (iii) interrupt and resume DOACs for procedures. The main recommendations are as follows: (i) Select the appropriate dose of DOAC according to indications and consider patient factors to minimise bleeding risks; (ii) DOACs do not require routine laboratory testing; (iii) for life-threatening uncontrollable bleeding, specific agents can be used to reverse the anticoagulant effects of DOACs; and (iv) DOACs can be interrupted for planned procedures without the need for 'bridging' with low-molecular-weight heparin (LMWH). The anticoagulant effects of DOACs can be reversed with specific agents, such as andexanet for apixaban and rivaroxaban and idarucizumab for dabigatran. If not available, pro-haemostatic agents such as prothrombin complex concentrates or activated prothrombin complex concentrates can be considered. DOACs can be interrupted and resumed for procedures without the need for 'bridging' with LMWH.

News (Medical) associated with Andexanet alfa

31 Dec 2024

·www.echemi.com

7 New Drugs Expected to Be Approved in 2025

In 2024, China approved several new drugs, and more blockbuster drugs are expected to be launched in 2025, covering oncology, autoimmune diseases, rare diseases, and other therapeutic areas. Drug Name Mechanism of Action Indications Development Institutions Evantuzumab c-Met/EGFR bispecific antibody Non-small cell lung cancer Johnson & Johnson; Genmab Taqetuzumab CD3/GPRC5D bispecific antibody Multiple myeloma Johnson & Johnson; Genmab Zenidatuzumab Anti-HER2 bispecific antibody Biliary tract cancer Zymeworks; Jazz Pharmaceuticals; BeiGene Inalises PI3Kα inhibitor HR-positive breast cancer Roche; Chugai Pharmaceutical Asunitinib STAMP allosteric inhibitor Speculated use for chronic myeloid leukemia treatment Novartis Tazemetostat EZH2 inhibitor Follicular lymphoma Epizyme; Huadong Medicine; Eisai Relatuzumab-alpha PDL1/TGF-β bispecific antibody Stomach cancer; gastroesophageal junction cancer Hengrui Medicine; Dong-A Pharma Vabysmo EGFR antibody-drug conjugate Nasopharyngeal cancer Lepu Biopharma Tenapanor NHE3 inhibitor Chronic kidney disease hyperphosphatemia Ardelyx; Kyowa Kirin; Fosun Pharma; AstraZeneca Mersutide OXM analog; GLP-1R/GCGR agonist Obesity Eli Lilly; Innovent Biologics Vusirumab IL-1β monoclonal antibody Gouty arthritis Junshi Biosciences Romosozumab SOST monoclonal antibody Osteoporosis Astellas; Amgen; UCB Teplizumab CD3 monoclonal antibody Type 1 diabetes Ligand Pharmaceuticals; Johnson & Johnson; Sanofi Solrepinib Syk inhibitor Immune thrombocytopenic purpura Huadong Medicine BBM-H901 Factor IX gene therapy Hemophilia B Gene Therapy Fitusiran RNAi therapy Hemophilia A; Hemophilia B Sanofi; Alnylam Andexanet alfa Recombinant factor Xa Factor Xa inhibitor antidote Portola Pharmaceuticals Lisocabtagene maraleucel IL-23p19 monoclonal antibody Crohn's disease Boehringer Ingelheim; AbbVie Lemborexant & Daridorexant OX1R antagonist; OX2R antagonist Insomnia Eisai & Idorsia; Sihuan Pharmaceutical; Nxera Pharma Highlights of new drug approvals in 2024 include: 1. Oncology: The world’s first antibody-drug conjugate (ADC) targeting folate receptor alpha (FRα) for ovarian cancer: Mirvetuximab soravtansine. PD-1/VEGF bispecific antibody envafolimab and Nectin-4 ADC enfortumab vedotin. 2. Autoimmune diseases: IL-17A/F monoclonal antibody bimekizumab for ankylosing spondylitis. 3. Rare diseases: Novartis’ complement factor B inhibitor for paroxysmal nocturnal hemoglobinuria (PNH). Blockbuster drugs expected to be approved in 2025 include: Oncology: Amivantamab (Q1) The world’s first c-Met/EGFR bispecific antibody. Highlight: Phase III study showed significant extension of median progression-free survival (mPFS). Talquetamab (Q2) A CD3/GPRC5D bispecific antibody and the world’s first drug targeting GPRC5D. Clinical results: Objective response rate (ORR) in Chinese patients was 69.0%-73.6%. Zanidatamab (Q2) A HER2-targeting bispecific antibody based on Azymetric™ technology. Indication: HER2-positive biliary tract cancer (BTC) with an ORR of up to 52%. Inavolisib (Q3) Roche’s highly selective PI3Kα inhibitor for PIK3CA-mutated breast cancer. Asciminib (Q3) Novartis’ Bcr-Abl allosteric inhibitor for Philadelphia chromosome-positive chronic myeloid leukemia (CML). SHR-1701 (Q4) A PD-L1/TGF-βRII bifunctional fusion protein for first-line treatment of gastric cancer. Phase III study demonstrated significant extension in median overall survival. MRG003 (Q4) China’s first EGFR-targeting ADC with remarkable efficacy in nasopharyngeal carcinoma. Endocrinology and Metabolism: Tenapanor (Q1) The world’s only approved NHE3 inhibitor for controlling hyperphosphatemia in chronic kidney disease patients. Trend Analysis: Continued Innovation in Oncology: The emergence of multiple bispecific antibodies and ADC drugs is making targets and treatment options more precise and diverse. Breakthroughs in Autoimmune and Rare Diseases: New biologics are gradually addressing drug resistance and limited treatment options in previous therapies. Emergence of Domestic Innovative Drugs: Examples include SHR-1701 and MRG003, highlighting the growing research and development capabilities of Chinese pharmaceutical companies. The sequential launch of these drugs will provide new therapeutic options for Chinese patients and enhance China’s position in the global pharmaceutical market.

Drug ApprovalPhase 3Clinical ResultADCImmunotherapy

20 Dec 2024

·www.echemi.com

AstraZeneca's Andexxa Denied Full FDA Approval

Recently, AstraZeneca announced that the FDA has rejected its application for full approval of the drug Andexxa. Andexxa was submitted for market approval in China in December 2022. Initially, it received accelerated approval from the FDA in 2018 and conditional approval from the European Union in 2019. It is primarily used to treat acute bleeding caused by apixaban and rivaroxaban and is the only drug that can specifically reverse the activity of FXa inhibitors, hence being referred to as a "life-saving drug." In 2021, AstraZeneca acquired Alexion for $39 billion, which made Andexxa part of its product line. Reports indicate that Andexxa generated sales of $182 million in 2022, marking a 23% year-on-year increase. The FDA's reason for rejection was that the data provided by AstraZeneca revealed a "significant safety issue": the thrombosis-related mortality rate among patients using Andexxa was twice that of standard treatment. AstraZeneca stated that Andexxa will remain on the U.S. market and plans to collect further data to address the FDA's concerns. If subsequent data is unfavorable, there is a risk of withdrawal from the market. This decision could affect Andexxa's fate in other markets. Currently, its application for market approval in China is still pending, and in March next year, Andexxa's conditional approval in the EU may face stricter scrutiny. "Savage" Drug Reversal Agent With the rapid growth of Xa factor inhibitors such as rivaroxaban and apixaban in thrombotic treatment, these drugs have quickly replaced warfarin as the mainstream anticoagulants. In 2019, the combined sales of rivaroxaban and apixaban reached $16.4 billion, but complaints about bleeding events have also increased. As an antidote to reverse the anticoagulant effects of "saban" drugs, Andexxa can quickly reverse their impact. In 2020, Alexion acquired Andexxa for $1.4 billion, and it subsequently fell under AstraZeneca's umbrella. AstraZeneca has high hopes for Andexxa, with sales continuing to grow, reaching $182 million globally in 2023, a 24% year-on-year increase in the first three quarters. The company is advancing post-marketing clinical trials to seek comprehensive approval. Continuing to Seek Full Approval Industry insiders were surprised by the FDA's rejection. The ANNEXA-I trial conducted in June 2023 showed that Andexxa performed well in hemostatic capability, leading AstraZeneca to terminate the clinical trial early. However, the FDA advisory committee pointed out that the incidence of thrombosis significantly increased among patients using Andexxa. Nevertheless, the FDA's stance was not entirely resolute; committee members suggested modifying the indications and dosage to better assess Andexxa's safety. Currently, AstraZeneca plans to present complete efficacy and safety data at the upcoming medical conference. If supplemental data supports its safety, Andexxa's future remains promising.

Drug ApprovalAcquisitionClinical StudyAccelerated Approval

17 Dec 2024

·www.fiercepharma.com

FDA rejects J&J's subcutaneous Rybrevant filing and AZ's full approval bid for Andexxa

The FDA has sent complete response letters to Johnson & Johnson, rejecting its subcutaneous version of Rybrevant, and to AstraZeneca, giving a thumbs down to its bid for full approval of Andexxa. Johnson & Johnson has received coal in its stocking from the FDA as manufacturing issues have tripped up the company’s attempt to gain approval of its subcutaneous version of lung cancer drug Rybrevant (amivantamab).The U.S. regulator sent J&J a complete response letter (CRL) rejecting its application to clear Rybrevant’s injected formulation for patients with non-small cell lung cancer (NSCLC) with epidermal growth factor receptor (EGFR) mutations.The FDA also has sent a CRL to AstraZeneca, swatting its request for full approval of Andexxa, which reverses the anticoagulant effect of blood thinners. The thumbs down was not a surprise as it came three weeks after an FDA advisory panel questioned Andexxa’s safety profile.The rejection for J&J was based on observations FDA officials made at a manufacturing facility during a standard pre-approval inspection. The CRL is not related to the formulation of the treatment or its efficacy or safety, the company explained in a release. The agency has not asked J&J to conduct an additional clinical study and its current approval for Rybrevant’s intravenous remains unaffected, the drugmaker added.“We’re working closely with the FDA to bring SC amivantamab to patients as quickly as possible, and are confident in our path to resolution,” Yusri Elsayed, M.D., Ph.D., J&J’s global therapeutic area head for oncology, said in a release. There has been much anticipation for Rybrevant’s injected version since the company reported seven months ago that it had performed better than intravenous Rybrevant in a clinical trial, reducing the risk of death by 38%.In August, the FDA approved Rybrevant and Lazcluse as a first-line treatment for NSCLC with EFGR mutations. A win for SC Rybrevant could help J&J in its challenge against AZ’s EGFR standout Tagrisso, which is an oral drug. While IV Rybrevant can take up to five hours to administer, the SC version only takes up to seven minutes or five minutes at median. As for the FDA's rejection of Andexxa, the company said in an email that it will keep the treatment on the market in the U.S. AZ confirmed the CRL, which was reported last week by Pink Sheet.In the first nine months of this year, Andexxa generated U.S. sales of $61 million and $159 million worldwide, which was up 24% year over year. It has been on the market since 2018 when Portola Pharmaceuticals scored its accelerated approval.In 2020, Alexion bought out Portola in a much-criticized $1.4 billion deal. A year later, AZ acquired Alexion.

Drug ApprovalAcquisitionAccelerated Approval

100 Deals associated with Andexanet alfa

External Link

KEGG	Wiki	ATC	Drug Bank
D11029	Andexanet alfa	V03AB38	DB14562

R&D Status

Approved

10 top approved records.

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Indication	Country/Location	Organization	Date
Hemorrhage	United States	Portola Pharmaceuticals LLC	03 May 2018
Hemorrhage	United States	AstraZeneca AB	03 May 2018

Developing

10 top R&D records.

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Indication	Highest Phase	Country/Location	Organization	Date
Massive hemorrhage	Phase 3	-	AstraZeneca PLC	02 Aug 2024

Clinical Result

Indication

Phase

Evaluation

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Study	Phase	Population	Analyzed Enrollment	Group	Results	Evaluation	Publication Date


ATS2025	Not Applicable	Upper gastrointestinal hemorrhage	320	Andexanet Alpha	illydeiryp(ahbegvnuld): HR = 1.5 (95% CI, 0.93 - 2.33), P-Value = 0.09 View more	Negative	16 May 2025
				Protein Complex Concentrate (PCC)
NCT03661528 (ANNEXA-I Biomarker Substudy \| ANNEXA-I, CTgov)	Phase 4	Intracranial Hemorrhages	530	andexanet alfa (Andexanet Alfa)	zavfvuhmjl = dyprzabczx pwbzglmtjn (rcbmtjoqvp, njbezyjszi - ngcojjebkq) View more	-	03 Jul 2024
				Usual Care (Usual Care)	zavfvuhmjl = amryrcodnh pwbzglmtjn (rcbmtjoqvp, ghjsvwoido - jfiicofdjz) View more
NCT03661528 (Pubmed) Manual	Phase 4	Cerebral Hemorrhage	530	Andexanet alfa	cakhtidooh(upqifhyebh) = pgkxbxulrm jvyaomuxlk (iuxinawaso ) View more	Positive	16 May 2024
				Andexanet (Usual care)	cakhtidooh(upqifhyebh) = jnfqwqndgr jvyaomuxlk (iuxinawaso ) View more
ISC2024	Not Applicable	Cerebral Hemorrhage antiXa	103	Prothrombin complex concentrate (PCC)	xghruvcckk(hoxokryoqi) = qvhajcnuue tkjymywwio (uikttloxxt ) View more	Positive	01 Feb 2024
ISTH2023	Not Applicable	Hemorrhage factor Xa (FXa) inhibitors rivaroxaban \| apixaban	-	Andexanet alfa	yqbepcsnzr(hwsplrzcoa) = jtnzspjnys hsigefemsu (qxemcccygw ) View more	-	24 Jun 2023
				4-factor prothrombin complex concentrate	yqbepcsnzr(hwsplrzcoa) = ohwkppmaei hsigefemsu (qxemcccygw ) View more
ISTH2023	Not Applicable	Hemorrhage	-	Andexanet alfa	cevdcktqjx(ywvuaohpfs) = lrqyqbuook cfxxawrwcv (cmewzwxbgo )	-	24 Jun 2023
				4-Factor Prothrombin Complex Concentrate (4F-PCC)	cevdcktqjx(ywvuaohpfs) = dxsodepqxs cfxxawrwcv (cmewzwxbgo )
NCT02329327 (ANNEXA-4, Pubmed \| Circulation)	Phase 3	Hemorrhage	479	Andexanet alfa	mlvgguufme(qrimghsvjk) = qormorwsvr nlufmuappt (mxnqdsooey, 10.0)	-	20 Feb 2023
ISTH2022	Not Applicable	-	-	Andexanet alfa	fprrfmucez(lygcjnfwei) = hsyyavfiju kxrpbbsdvp (qvrfksvouh )	-	09 Jul 2022
				4F-PCC	fprrfmucez(lygcjnfwei) = lmggrehthe kxrpbbsdvp (qvrfksvouh )
ISTH2022	Not Applicable	-	-	Unfractionated Heparin (UFH)	ywlbeyhhxe(oyogcvssmv) = bajccsfgjg rrsamajsbv (nralpzkeun )	-	09 Jul 2022
				Enoxaparin	ywlbeyhhxe(oyogcvssmv) = onvwixgxsv rrsamajsbv (nralpzkeun )
NCT02329327 (Pubmed \| Crit Care)	Phase 3	Intracranial Hemorrhages	-	Andexanet alfa	cyktjrucla(dcfikjuyih) = qfozsnrour pjgbldjyxv (byzepdxrws ) View more	-	16 Jun 2022
				Four-factor prothrombin complex concentrate (4F-PCC)	cyktjrucla(dcfikjuyih) = twxcffnvaw pjgbldjyxv (byzepdxrws ) View more

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