title: Role of clinical pharmacists to prevent drug interactions in cancer outpatients: a single-centre experience.
abstract: BACKGROUND
  Cancer patients are especially vulnerable to drug interactions, which may alter the efficacy and toxicity of treatment, leading to severe clinical consequences.
  
  
  OBJECTIVE
  Determine the incidence of such interactions in patients receiving chemotherapy, as well as to identify the drugs most frequently involved, investigate the influence of the pharmacist's interventions and verify the degree of acceptance of pharmacist's recommendations by the medical team.
  
  
  METHODS
  The oncology department of a Spanish tertiary hospital.
  
  
  METHODS
  During 3 months, all the drug interactions in the regular combined with treatment for cancer were analysed using two databases, and recommendations were made when clinically significant interactions (CSI) were identified.
  
  
  METHODS
  Incidence of CSI in oncology outpatients; drugs involved in CSI.
  
  
  RESULTS
  Of the 75 patients included, 31 (41%) presented CSI. Most interactions were among drugs included in the patient's usual treatment. The principal drug groups involved in CSI were cytostatic agents, antiemetics and antidepressants. The hospital pharmacist intervened on 20 occasions (35% of the patients presenting drug interactions). These interventions mainly focused on recommendations to modify or discontinue drug prescriptions, and were followed in 94% of cases.
  
  
  CONCLUSIONS
  The incidence of drug interactions in cancer patients is high, and they most often involve medications to treat comorbid conditions. The pharmacist, as a member of the multidisciplinary team, can contribute significantly by checking the treatment prescribed and detecting interactions, to reduce medication-related problems and to optimise drug therapy for these patients.
authors.affiliation: Pharmacy Department, Hospital Costa del Sol, Marbella, Málaga, Spain, carmen_lopez_martin@hotmail.com.
authors.forename: Carmen
authors.initials: C
authors.lastname: Lopez-Martin
authors.forename: Margarita
authors.initials: M
authors.lastname: Garrido Siles
authors.forename: Julia
authors.initials: J
authors.lastname: Alcaide-Garcia
authors.forename: Vicente
authors.initials: V
authors.lastname: Faus Felipe
mesh_terms: D000368:Aged; D000553:Ambulatory Care / Q000379:methods*; D000970:Antineoplastic Agents / Q000009:adverse effects; D004347:Drug Interactions / Q000502:physiology; D064420:Drug-Related Side Effects and Adverse Reactions / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000188:drug therapy* / Q000453:epidemiology; D010595:Pharmacists; D010607:Pharmacy Service, Hospital / Q000379:methods*; D024382:Professional Role; D011446:Prospective Studies
chemical_list: D000970:Antineoplastic Agents