The operation was conducted at seven locations including Solan (Himachal Pradesh), Panchkula (Haryana), Mumbai and Chandigarh, the official said.
The survey operation at Theon Pharmaceuticals began at around 1 pm and around 70 income tax sleuths from Punjab, Haryana and Chandigarh were involved in the whole operation.
The department is looking into the alleged "misuse of the tax incentives" by the pharma company, the official said.
Theon Pharmaceuticals Ltd manufactures tablets, capsules, injectables and dry syrup formulations.