She is known for her role as Karthika/Karthu in the soap opera Karuthamuthu, which premiered on Asianet and also for portraying Deepa in the Telugu serial Karthika Deepam on Star Maa.
Premi Vishwanath began her career in Malayalam Tv industry through Karuthamuthu,in which she played the lead role of Karthika Balanchandran.
After being replaced by Renu Soundar in Karuthamuthu, she went on to play Mayilamma in the show Moonumani, which aired on Flowers (TV series) channel.
She continued her career with Malayali series, until she got a huge break in the Telugu television industry.
Deeming the show's popularity and her role as Deepa, a spiritual sequel and second season of Karthika Deepam started airing on 25 March 2024.