Puthiya Niyamam, the social thriller, which stars Mammootty and Nayantara in the lead roles, is running successfully at the theatres. The AK Sajan directed movie has already emerged as a blockbuster. When it completed 5 days at the box office, the movie would have managed to collect 5.98 crores at the box office. Puthiya Niyamam had made a decent opening, by collecting Rs 1.20 Crores on the first day.