  The Nikiforov-Uvarov polynomial method employed by Aguda to solve the Dirac
equation with an improved Rosen-Morse potential plus a Coulomb-like tensor
potential is shown inappropriate because the conditions of its application are
not fulfilled. We clarify the problem and construct the correct solutions in
the spin and pseudospin symmetric regimes via the standard method of solving
differential equations. For the bound states, we obtain the spinor wave
functions in terms of the generalized hypergeometric functions and in each
regime we show that the energy levels are determined by the solutions of a
transcendental equation which can be solved numerically.
