Exhibit 99.1

January 8, 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: Intimation of Earnings call

Please find enclosed a notification titled “Dr. Reddy's to release Q3FY26 results on Wednesday, January 21^st, 2026; Earnings call slated @19:30 PM IST / 9:00 AM ET.”

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

Dr. Reddy's to release Q3FY26 results on Wednesday, January 21^st, 2026;

Earnings call slated @19:30 PM IST / 9:00 AM ET

Hyderabad, India, January 8^th, 2026

Dr. Reddy's Laboratories Ltd. (BSE: 500124, NSE: DRREDDY, NYSE: RDY, NSEIFSC: DRREDDY) will announce results for the quarter and nine months ended December 31^st, 2025 on Wednesday, January 21^st, 2026 after the Board Meeting.

Summary of Events

Earnings Call

Following the release, the management of the Company will host its earnings call to discuss the Company’s financial performance.

Pre-register with the link below:

https://drreddys.zoom.us/webinar/register/WN_wj_WaDfNT8m2RusUHh-ldQ