The present investigation looked at how heat and mass transfer affects MHD flow of micropolar fluid over a horizontal cylinder in a porous medium in presence of thermal radiation and viscous dissipation. The novelty of the present study is that it took considerations about the impact of radiation, MHD, and viscous dissipation on micropolar fluid flow over a horizontal porous cylinder. The governing equations of the flow was converted with relevant boundary conditions using similarity transformations, and the bvp4c MATLAB solver was used to numerically solve fluid velocity, microrotation, temperature, and concentration and present them as graphs. A comparison was conducted with a previously published papers in the literature, and an excellent agreement was established. It is found in the present study that with raising magnetic field, velocity and angular velocity declines, but temperature and concentration profiles upsurges. For growing values in Eckert number and radiation parameter, temperature profile enhances. The current work may have applications in designing and optimizing cooling systems and energy generation.