Exhibit 99.1

June 22, 2026

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: Intimation regarding Board meeting and Trading window closure

Pursuant to Regulation 29 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, we hereby inform you that a meeting of the Board of Directors of the Company will be held on Wednesday, July 22, 2026, inter alia, to consider the Un-audited Standalone and Consolidated Financial Results of the Company for the quarter ending on June 30, 2026.

Further, kindly note that, under the provisions of the SEBI (Prohibition of Insider Trading) Regulations, 2015, the trading window for dealing in the securities of the Company will be closed from June 24, 2026, to July 24, 2026 (both days inclusive).

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