An on farm trial was to assess the impacts of the administration of a locally available dewormer on weight gain and their economics of Marwari goat in Pokaran region of Jaisalmer district of Rajasthan (India) during 2018-19. The sampled animals were divided into two groups. Each group had 50 animals comprising 25 male and 25 female goats, a treated and farmer practice group. Administration of dewormer albendazole was supplied in treatment group. Other control group was kept devoid from deworming which is farmer practice in that particular area. Results shows that male and female goats treated with dewormer showed overall live body weight higher by 5.56 and 4.60 percent respectively as compared to farmer practice group. Significantly (P<0.05) higher weight gain in male and female were recorded in treatment group followed by farmers practice group on day 15 and onward up to day 180. Treated male and female goat shows overall average daily gain higher by 7.08 g and 4.94 g/day respectively in treated male and female goat as compared to farmers practice group. Further it shows that gross return, net return and B: C ratio in treated goat found 5475, 4420 and 5.18 respectively higher and most effective as compared to farmer practice group. It can be concluded that Cost-benefit analysis of the treatment indicated that deworming was the most cost-effective way of improving the growth rate of the goats due to balancing of internal parasites which leads to increase benefits of the farmers in terms of productivity form goat rearing business.