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

September 6, 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,

Ref: Disclosure under Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015

This is to inform you that the United States Food & Drug Administration (USFDA) completed a GMP inspection at our API Mirfield facility in West Yorkshire, UK. The inspection was conducted from  September 1 to September 5, 2025. We have been issued a Form 483 with 7 observations, which we will address within the stipulated timeline.

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