Abstract : Medication Errors pose a threat to patient safety, however, identifying the occurrence of incidents of medication errors are important aspect of medication handling process. Purpose of the study is to identify the types of medication errors the respondents have experienced in the last 10 years and improve patient safety. 42 Pharmacists participated in the survey while 270 Registered Nurses were selected using consecutive sampling method (n=312). Reliability coefficient was 0.84; level of significance was α = 0.05. A self-structured questionnaire (see Supplementary files) was used for data collection. The research questions were analyzed with descriptive statistics such as frequency tables, charts, percentages and means while the research hypothesis were analyzed with Kruskal-Wallis non-parametric test for investigating variability within a variable while t-test and Levene’s test statistic were applied to investigate difference between two variables. The responses were scored (1-5) and the best response was assigned the highest score in descending order. Data was analyzed using Statistical Package for the Social Science version 21.0 and data presented on relevant tables and charts. The most common types of Medication Errors among the respondents were patient misidentification, giving the wrong medications, wrong dosage and wrong dosage form. The total mean action of pharmacists and nurses were 3.76 and 3.5 respectively. The Kruskal-Wallis test results showed that there was significant difference (p<0.05) between the types of medication error and the action to medication errors among the respondents. To improve patient safety, it is important to take into account several complex mechanisms such as periodic training of pharmacists and nurses, improving medication handling process. This article reports the results of a health care intervention on human participants. It was ethically approved at the Research Ethics Committee of the University of Port Harcourt Teaching Hospital Nigeria with the registration number UPTH/ADM/90/S. II/VOL.XI/44 on 13th July 2016.