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 www.drreddys.com

March 29, 2021

The Secretary

BSE Limited

National Stock Exchange of India Ltd.

New York Stock Exchange Inc.

NSE IFSC Ltd.

Dear Sir/Madam,

Sub: Board Meeting

Pursuant to Regulation 29 of Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, we hereby intimate you that a meeting of the Board of Directors of the Company will be held on Friday, May 14, 2021, inter alia, to consider and approve the Audited Financial Results of the Company for the financial year ended March 31, 2021, and recommend dividend, if any, for the financial year 2020-21.

Further, kindly note that, under the provisions of SEBI (Prohibition of Insider Trading) Regulations, 2015, the trading window for dealing in securities of the Company will be closed from Thursday, April 1, 2021 to Sunday, May 16, 2021 (both days inclusive).

This is for your information.

With regards,

/s/ Sandeep Poddar

Sandeep Poddar

Company Secretary