Exhibit 99.1

Indivior to Announce Q2 and H1 2024 Results and Host Webcast on July 25th

Slough, UK, and Richmond, VA, July 15, 2024 - Indivior PLC (NASDAQ/LSE: INDV) today announced that it will release its Q2 and H1 2024 results on July 25th at 7:00 a.m. London time (2:00 a.m. U.S. Eastern). The results will be available via the London Stock Exchange's Regulatory News Service (RNS) and on the "Investors" section of the company's website atwww.indivior.com.

Mark Crossley, Chief Executive Officer, and other members of Indivior's leadership team will host a presentation via live webcast at 1:00 p.m. London time (8:00 a.m. U.S. Eastern) on July 25th.

Access to the Live Webcast Presentation:

The webcast event and materials can be accessed on the "Investors" section of the company's website atwww.indivior.combefore the event begins.

The webcast link:https://edge.media-server.com/mmc/p/jpgy4cd9

Participants may access the presentation telephonically by registering with the following link:

https://register.vevent.com/register/BIdf08b662a5f24248bf5f8677f59ef713

(Registrants will have an option to be called back directly immediately prior to the call or be provided a call-in # with a unique pin code following their registration)

A replay of the presentation will be available atwww.indivior.com.

About Indivior

Indivior is a global pharmaceutical company working to help change patients' lives by developing medicines to treat substance use disorders (SUD), overdose and serious mental illnesses. Our vision is that all patients around the world will have access to evidence-based treatment for the chronic conditions and co-occurring disorders of SUD. Indivior is dedicated to transforming SUD from a global human crisis to a recognized and treated chronic disease. Building on its global portfolio of OUD treatments, Indivior has a pipeline of product candidates designed to both expand on its heritage in this category and potentially address other chronic conditions and co-occurring disorders of SUD, including alcohol use disorder and cannabis use disorder. Headquartered in the United States in Richmond, VA, Indivior employs approximately 1,100 individuals globally and its portfolio of products is available in 37 countries worldwide. Visit www.indivior.com to learn more. Connect with Indivior on LinkedIn by visiting www.linkedin.com/company/indivior.

Contact:

Jason Thompson

Vice President, Investor Relations

Tel: 804-402-7123 orjason.thompson@indivior.com

Tim Owens

Director, Investor Relations

Tel: 804-263-3978 ortimothy.owens@indivior.com

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