*Purpose: Solid organ transplant (SOT) patients require a complex medication regimen which increases the risk of many drug-related problems. The purpose of this study was to describe drug-related problems (DRPs) detected by pharmacy residents as well as pharmaceutical interventions in a transplant clinic.

*Methods: An observational, prospective, cross sectional study was conducted at the transplant clinic of a multi-organ transplant program. A total of 77 patients with a SOT were seen at the clinic from March to June 2019. Pharmacy residents did the following activities : medication reconciliation, detected DRPs, proposed interventions, did necessary follow-ups, and counseled patients.

*Results: A total of 104 DRPs were identified in 57 patients. At least one DRP was detected in 74% of patients seen by pharmacy residents (95% CI 0.64-0.84). The most frequent type of DRPs were untreated indication (26%), non conformity to guidelines or contraindication (16%) and drug without indication (12%). A total of 97 interventions were made in 55 patients. 71.4% of patients needed at least one pharmaceutical intervention (95% CI 0.61-0.82). The prevalence of DRPs and pharmaceutical interventions was higher in patients within their first year post-transplant. In general, both the patients and the transplant multidisciplinary team appreciated the presence of the pharmacy resident at the clinic.

*Conclusions: A high prevalence of DRPs were documented in SOT patients. The addition of a transplant pharmacist at the outpatient clinic could be beneficial to patients and the multidisciplinary transplant team.

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