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

March 21, 2025

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)

Dear Sir/Madam,

Sub: Intimation regarding Board meeting and Trading window closure

Pursuant to Regulation 29 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, we hereby inform you that a meeting of the Board of Directors of the Company will be held on Friday, May 9, 2025, inter alia, to consider and approve the Audited Standalone and Consolidated Financial Results of the Company for the quarter and financial year ending on March 31, 2025, and to recommend final dividend, if any, for the financial year 2024-25.

Further, kindly note that, under the provisions of the SEBI (Prohibition of Insider Trading) Regulations, 2015, the trading window for dealing in securities of the Company will be closed from March 25, 2025 to May 11, 2025 (both days inclusive).

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