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Methanolic extract of Euphorbia prostrata when administered orally at the dose level of 400 mg/kg body weight per day for 60 days to male rats did not cause any significant loss in their body weights, but the weights of their reproductive organs, i.e., testes, epididymides, seminal vesicle, and ventral prostate, decreased in a significant manner when compared to the controls. The production of round spermatids was reduced by 73.04% in E. prostrata-treated rats. The population of preleptotene spermatocytes and spermatogonia were reduced by 65.07% and 47.48% and secondary spermatocytes by 73.41%, respectively. The cross-sectional surface area of Sertoli cells, as well as the cell counts, was found to have been depleted significantly. Leydig cell nuclear area and the number of mature Leydig cells decreased by 57.47% and 54.42%, respectively. Sperm motility, as well as sperm density, reduced significantly. E. prostrata reduced the fertility of male rats by 100%. The protein, glycogen, and cholesterol contents of the testes, fructose in the seminal vesicle, and protein in the epididymides significantly decreased. Histoarchitecture of the testes showed vacuolization at the primary spermatocyte stage. Highly reduced seminiferous tubular diameter and increased intertubular space were also observed when compared to the controls. [ABSTRACT FROM AUTHOR]