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 24, 2025

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

BSE Limited (Stock Code: 500124)

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

NSE IFSC Ltd. (Stock Code: DRREDDY)

Dear Sir/Madam,

Sub:

Copies of newspaper advertisement regarding unaudited financial results for the quarter ended June 30, 2025

Pursuant to Regulation 47 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulation, 2015, as amended, please find enclosed copies of newspaper advertisement regarding the unaudited financial results of the Company for the quarter ended June 30, 2025, as published in Financial Express and Andhra Prabha on July 24, 2025.

This is for your information and record.

Thanking you.

Yours faithfully,

For Dr. Reddy’s Laboratories Limited

K Randhir Singh

Company Secretary, Compliance Officer & Head-CSR

Encl: As abovep