Reverse events are common in health care organizations. Medication errors is the most prevalence of reverse events ; rates range widely from 0.2% to 90.6% reflecting differences in the type of medication error(in the UK) this (incidence and prevalence of this nursing problem. The Aim: evaluate risk and hazards during using medication cart by nursing students in the critical care unit and the plan to improve student competence. Setting: Study was conducted in the faculty of nursing, Njran University. Sample: All the available nursing students at levels 6 & 7 (85). Tool of Data Collection: nursing students' questionnaire sheet: for assessing nursing students’ knowledge regarding medication cart; it include two parts:- Part (1): demographic characteristics of nursing students as: age, educational level. Part (2): students’ knowledge regarding medication cart to assess knowledge and attitude toward causes of medication hazards and errors. The score of knowledge test expressed as percent from a maximum of 30 points as follow: ≥ 70 % considered satisfactory level of knowledge. < 70 % considered unsatisfactory level of knowledge. Designed plan to improve student competence. Results: there was highly statistically significant differences in students' knowledge related to medication cart between pre and post implementation of the plan with p <0.001 & P<0.05.The statistically significant relation between mean score of students' total knowledge regarding MC and age in with P<0.05.while there was no statistically significant relation between mean score of their total knowledge with level 7 in both pre & post implementation of the plan with P >0.05. Conclusions: we concluded that there was a highly statistically significant improvement in nursing students' competence regarding medication errors. Recommendations: study recommend regular nursing instructions and evaluation should apply in various clinics. The instructive booklet ought to increase their competences and additional research is needed to explore how to reduce medication errors.