Radikaa is the daughter of actorM. R. Radha and Geetha.[4] Her father is a Telugu[5][6] from Chennai and her mother is a Tamil from Sri Lanka, native ofWennappuwa.[2][7] Radikaa did her education in India, Sri Lanka and a course in London, which she discontinued.[8] She has a younger sisterNirosha, who is also an actress and two younger brothers, Raju and Mohan. She also has two half-brothersRadha Ravi andM. R. R. Vasu.
Radikaa married actorSarathkumar on 4 February 2001. They had been friends before their marriage and had been paired in two films:Namma Annachi (1994) andSuryavamsam (1997). The couple has a son named Rahhul born in 2004. Radikaa has a daughter Rayane born in 1992.
Radikaa made her cinematic debut in the 1978 Tamil movieKizhakke Pogum Rail after accidentally meetingBharathiraja.[11] Thereafter, she acted in several Tamil, Telugu, Kannada, Hindi and Malayalam films.
After becoming successful in cinema, Radikaa wanted to do something different and decided to take on the small screen, a venture that everyone thought was a mistake and one she would regret. But determined to pursue something she believed in, namely producing television serials under her own banner, she started Radaan Mediaworks in 1994. After some initial hiccups, the company re-emerged successfully as a publicly listed company Radaan Mediaworks (I) Ltd in 1999.
In 2014, Radiance Media Private Ltd. filed a petition claiming that Magic Frames, a company where Radhika and her husband Sarathkumar are partners, borrowed ₹1.50 crore and later her husband Sarathkumar took an additional loan of ₹50 lakhs in an agreement that the amount would be returned by March 2015. In 2017, Radiance media alleged that Magic Frames issued seven cheques as repayment and all of thecheques bounced for which seven cases were filed.[21][22] In 2019, theMadras High Court had declined to quash the criminal proceedings in the pending cases after the couple moved the high court to quash them.[23] Radikaa and Sarathkumar were convicted in the case by the Special Court on 7 April 2021. The court sentenced them to one year in prison and a fine of ₹3.3 crore.[21] On the same day, her husband, Sarathkumar, received relief from the court for the sentence and the court issuedarrest warrant to Radikaa since she had not appeared in court.[24]
TheIncome Tax department conducted a raid on Radaan Mediaworks India Limited, a media company owned by Radikaa Sarathkumar, in Chennai on 11 April 2017, days after the department interrogated her husband Sarathkumar and searched his house.[25][26]