Objective: To analyze the prevalence of prescription drugs, previously selected, that should be monitored by their analytical test, and the rate of alteration in these tests, with the aim of establishing priorities to facilitate monitoring.
Method: Prospective observational study in the Internal Medicine department of a referral hospital of 350 beds. In a first phase, we selected some drugs which analytical monitoring is recommended for the medical literature, and after that, we reviewed the pharmacological treatment of all patients admitted with any of these drugs.