Rajesh Khanna had done another film with the name Dushman in 1971.
Shakti Samanta's Bengali Version (Dushman 1990)
This film was shot simultaneously in Bengali as Andha Bichar. This is the sixth film of Shakti Samanta which are bilingual (Bengali and Hindi).
The story of this film resembles the story of Nasir Hussain's Zabardast. Sanjeev Kumar's role was similar to Alok Nat's role in Dushman.
After about 2 decades of Shakti Samanta and R.D.Burman working together. Dushman is their last film together.