Exhibit 99.1

Dr. Reddy's Laboratories Ltd. 8-2-337, Road No. 3, Banjara Hills Hyderabad – 500 034, Telangana, India CIN: L85195TG1984PLC004507   Tel: + 91 40 4900 2900 Fax: + 91 40 4900 2999 Email: mail@drreddys.com Web: www.drreddys.com

May 12, 2026

National Stock Exchange of India Ltd. (Scrip Code: DRREDDY)

BSE Limited. (Scrip Code: 500124)

New York Stock Exchange Inc. (Stock Code: RDY)

NSE IFSC Ltd. (Stock Code: DRREDDY)

Sub: Outcome of Board Meeting held on May 12, 2026

Dear Sir/Madam,

In continuation to our letters dated March 23, 2026, and April 16, 2026, we would like to inform that the Board of Directors of the Company, at its meeting held today, i.e., May 12, 2026, inter alia considered and approved the following:

Approved the Audited Financial Results of the Company for the quarter and financial year ended March 31, 2026. Accordingly, the following are enclosed:

Pursuant to Regulation 33 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, (“SEBI Listing Regulations”), the Audit Reports of the Statutory Auditors on the aforesaid financial results are enclosed.

A declaration under Regulation 33(3)(d) of the SEBI Listing Regulations, signed by Chief Financial Officer in respect of Audit Reports issued by Statutory Auditors with un-modified opinion is attached herewith.

Recommended a final dividend of INR 8/- per equity share of face value of Rs. 1/- each for the financial year 2025-26, subject to approval of shareholders at the ensuing Annual General Meeting. Pursuant to Regulation 42 of SEBI Listing Regulations, the record date for determining the members eligible to receive the said dividend has been fixed as July 10, 2026.

Approved convening of the 42^nd Annual General Meeting (“AGM”) of the Company on Thursday, July 23, 2026.

Approved re-appointment of Dr. K P Krishnan (DIN: 01099097) as an Independent Director for a second term of five consecutive years from January 7, 2027 to January 6, 2032, not liable to retire by rotation, subject to approval of the shareholders at the ensuing AGM.

Dr. Krishnan is not related to any of the Directors or Key Managerial Personnel of the Company and is not debarred from holding the office of Director by virtue of any SEBI order or any other such authority. He meets the criteria for being re-appointed as an Independent Director under the applicable laws.

Approved appointment of Mr. Srikanth Velamakanni (DIN: 01722758) as an Additional Director, categorized as an Independent Director, for a term of five consecutive years, from July 1, 2026 to June 30, 2031, not liable to retire by rotation, subject to approval of shareholders at the ensuing AGM.

Mr. Srikanth is not related to any of the Directors or Key Managerial Personnel of the Company and is not debarred from holding the office of Director by virtue of any SEBI order or any other such authority. He meets the criteria for being appointed as an Independent Director under the applicable laws.

Approved appointment of M/s Deloitte Haskins & Sells, LLP, Chartered Accountants (Firm Registration No. 117366W/W-100018), as the Statutory Auditors of the Company, for a term of five consecutive years, commencing from the conclusion of the 42^nd AGM till the conclusion of the 47^th AGM, subject to the approval of the shareholders at the ensuing AGM.

Approved re-appointment of M/s Sagar & Associates, Cost Accountants (Firm Registration No. 000118), as the Cost Auditors of the Company for the Financial Year 2026-27.

Approved elevation of Mr. Sandeep Khandelwal, Global Generics India Head, as a Senior Management Personnel of the Company and induction as a member of the Management Council, effective May 12, 2026. The revised list of Senior Management Personnel is attached.

The disclosures required under Regulation 30 of the SEBI Listing Regulations read with SEBI Master Circular No. HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026, are attached as Annexures.

The Board Meeting commenced at 2:00 PM IST and concluded at 3:47 PM IST.

This is for your information and records.

Thanking you.

Yours faithfully,

For Dr. Reddy’s Laboratories Limited

K Randhir Singh

Company Secretary, Compliance Officer & Head-CSR

Encl: as above

Details of Dr. K P Krishnan (DIN: 01099097)

Brief Profile of Dr. Krishnan:

Dr. K.P. Krishnan is a former IAS officer with 37 years of distinguished service in public policy, economic governance, and regulatory reform across the Government of India, Government of Karnataka, and the World Bank. He has held key national leadership roles, including Secretary, Ministry of Skill Development and Entrepreneurship; Additional/Special Secretary in the Ministries of Finance and Rural Development; and Secretary to the Prime Minister’s Economic Advisory Council.

A respected academician, he has taught at IIM Bangalore, ISB, and Ashoka University, held the Bok Visiting Professorship at the University of Pennsylvania Law School, and served as IEPF Chair Professor at NCAER, New Delhi. He is currently a Distinguished Fellow at the Isaac Centre for Public Policy, Ashoka University.

Dr. Krishnan serves on the boards and advisory councils of several leading corporates and non-profits, including Dr. Reddy’s Laboratories, Tata Consumer Products, Shriram Capital, ASREC India, Helios Trustee, Razorpay, and the Sanmar Group. He holds degrees in Economics (St. Stephen’s College), Law (Campus Law Centre, University of Delhi), and a Ph.D. in Economics (IIM Bangalore).

Details of Mr. Srikanth Velamakanni (DIN: 01722758)

Brief Profile: Mr. Srikanth Velamakanni

Mr. Srikanth Velamakanni is one of India’s most influential technology leaders and a global champion of artificial intelligence. He is the Co-Founder and Group Chief Executive of Fractal, India’s first publicly listed pure-play AI company. He also serves as the Chairperson of Nasscom and as a Founder-Trustee of Plaksha University. Srikanth's work is guided by a long-term commitment to building technology that expands human potential.

Details of Statutory Auditors

Details of Cost Auditors

Details of Mr. Sandeep Khandelwal

Brief Profile of Mr. Sandeep Khandelwal

Sandeep Khandelwal brings 26 years of leadership experience across General Management, Sales, Marketing and functional roles, with deep sectoral expertise spanning Pharmaceuticals, OTC, FMCG and Consumer Durables and extensive exposure across South Asia.

Sandeep joined Dr. Reddy’s Laboratories in 2018 and currently heads the India sub-continent business, a USD 750 million operation spanning India, Nepal, Sri Lanka, Myanmar, Maldives and Mauritius. He leads a 10,000-strong organization across more than 45 divisions and six countries.

Over the last seven years, Sandeep has led a significant transformation of Dr. Reddy’s India business, evolving it from a branded generics-centric model into a multi-engine organization, with innovative assets and consumer businesses shaping the next phase of growth. During this period, the India topline has grown from Rs 2,300 crore to Rs 7,000 crore, EBITDA margins have expanded from 19 percent to 24 percent, and the company’s market rank in India has improved from 16th to 9th. The business has consistently delivered quarter-on-quarter market-beating growth over the last 1.5 years.

He has shaped and is executing a clear strategic agenda focused on strengthening core brands, sharpening portfolio choices and structurally improving profitability. The emphasis has been on elevating business quality through higher throughput efficiency, disciplined gross-to-net management and selective pruning of non-core elements, while progressively refreshing the portfolio through differentiated internal R&D-led launches and curated in-licensing partnerships with global and regional pharmaceutical players. In parallel, he instituted strong medical and marketing excellence capabilities to anchor a sustained, multi-year growth runway for the company’s flagship brands.

Sandeep has embedded a strong “Playing to Win” performance culture across the organization and accelerated the adoption of digital and multi-channel engagement models, resulting in a 14 percent improvement in field force productivity. He has also led complex change-management efforts across employees, channel partners, trade bodies and employee unions.

Key milestones under his leadership include the Wockhardt and Novartis acquisitions, the establishment of the Nestlé–Dr. Reddy’s Nutrition joint venture, and expansion across high-growth platforms such as Vaccines, Biologics, Nutrition, OTC, E-commerce, Trade Generics, alternate channels and rural markets.

Prior to Dr. Reddy’s, Sandeep held senior leadership roles at Abbott India, including Commercial Director for Women’s Health, Gastroenterology, Hepatic and OTC therapies, and Director, Commercial Excellence. Earlier in his career at Marico Limited, he held multiple frontline and enterprise leadership roles across sales, trade marketing, channel development and regional management, including heading sales for the Rs. 2,100 crore personal care portfolio.

Sandeep has also driven a step-change in leadership diversity, significantly enhancing gender diversity and diversity of thought within leadership and commercial teams. He actively represents the organization at leading industry forums such as FICCI and the Indian Pharmaceutical Alliance. Key recognitions include being named among the “40 Under 40: Hottest Business Leaders” by The Economic Times in association with Spencer Stuart.

List of revised Senior Management Personnel