Known primarily for his functions within the Tamil film industry, Prashanth also made an appearance in a small number of Hindi, Malayalam, and Telugu features. His several screen performing credits include functions in Thiruda Thiruda; Denim jeans; Chembaruthi; and Kaadhal Kavithai. He produced his cinematic debut within the 1990 feature Vaigasi Poranthachu. A businessman in addition to an acting professional, he founded a jewelry shop in Chennai, India. His dad, Thiagarajan, and grandfather, Peketi Sivaram, both experienced successful acting professions. In 2000, he and Riya Sen co-starred within the Tamil film Good Luck.