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

October 29, 2026

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: Transcript of the Earnings call conducted on October 23, 2026

Pursuant to Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, please find enclosed the transcript of the Earnings call for the quarter and half year ended September 30, 2026, conducted on October 23, 2026. Also please note that this transcript of the call has been uploaded on our website and are available at the following link.

Weblink: EarningsCallTranscriptQ2FY27.pdf

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