The company has received an order under the Competition Act, 2002, from the Competition Commission of India (CCI) approving the proposed transaction, Sun Pharmaceutical Industries said in a regulatory filing.
"With this approval, all necessary regulatory approvals have been obtained," it added.
Last year in September, Sun Pharma and Strides Shasun (then Strides Arcolab) had inked a pact related to Ranbaxy's 'Solus' and 'Solus Care' divisions operating in the central nervous system (CNS) segment in India.
Sun Pharma acquired Ranbaxy Laboratories in a USD 4 billion deal in 2014.
The Sun Pharma stock today ended at Rs 790.05 on BSE, up 2.17 per cent from its previous close.