arXiv:1108.5868v1 [quant-ph] 30 Aug 2011 On Dirac equation for a Coulomb scalar, vector, and tensor interaction Omar Mustafa E-mail: omar.mustafa@emu.edu.tr, Tel: +90 392 630 1314, Fax: +90 392 3651604 October 24, 2018 Abstract In their recent paper (Inter. J. Mod. Phys. A 26 (2011) 1011), Zarrinkamar and coauthors have considered the radial Dirac equation for a Coulomb scalar, vector and tensor interaction. The exact solutions for the energy eigenvalues they have reported for spin-symmetry and pseudo- spin symmetry were mishandled and are incorrect eigenvalues, therefore. Keywords: Dirac equation, Coulomb interaction, spin-symmetry, pseudo- spin symmetry, energy eigenvalues PACS codes: 03.65.Ge, 03.65.Ca .In their recent paper, Zarrinkamar, Hassanabadi and Rajabi (Inter. J. Mod. Phys. A 26 (2011) 1011), have considered the radial Dirac equation for 1 Department of Physics, Eastern Mediterranean University, G Magusa, North Cyprus, Mersin 10,Turkey