Efficacy of Intravenous Fosfomycin in the Treatment of Complicated Urinary in Real-life Conditions.

Fosfomycin cohort: * Inclusion criteria: Patients over 18 years of age. Patients who have started treatment with intravenous fosfomycin, estimated that they will require at least 2 days of treatment with fosfomycin, initiated as either as empirical treatment (within 24 hours after the emergency visit or onset of symptoms) or targeted treatment (within 24 hours of the availability of the antibiogram). * Exclusion criteria: Patients under 18 years of age. Patients in palliative treatment. Control cohort (objective 1): * Inclusion criteria:Patients over 18 years of age. Patients who have started treatment with intravenous quinolones or beta-lactams, estimated that they will require at least 2 days of treatment with the drug, initiated as either as empirical treatment (within 24 hours after the emergency visit or onset of symptoms) or targeted treatment (within 24 hours of the availability of the antibiogram). Each patient from the fosfomycin cohort will be matched with a patient from this control cohort according to their. * Exclusion criteria: Patients under 18 years of age.Patients in palliative treatment; Informed consent not signed by the patient.