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

June 20, 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: Newspaper advertisement

Pursuant to Regulation 47 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, please find enclosed copies of the newspaper advertisement with respect to the deduction of tax at source on dividend pay-out to shareholders, as published in Business Standard and Nava Telangana. This communication has also been sent via email to all the shareholders.

This is for your information.

Thanking you.

Yours faithfully,

For Dr. Reddy’s Laboratories Limited

K Randhir Singh

Company Secretary, Compliance Officer & Head-CSR

Encl: as above