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

July 23, 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,

Pursuant to Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, we are enclosing herewith the presentation on the Unaudited Financial Results of the Company for the quarter ended June 30, 2025.

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