title: In Vitro Stabilifighty Evaluation of Different Pharmaceutical Products Containing Meropenem.
abstract: BACKGROUND
  Meropenem is a beta-lactam antibiotic for treating multidrug-resistant gram-negative bacilli infections. The expiry of the drug's patent (Merrem) allowed the production of generics to be commercialized by a few companies, including Hospira and Hikma. The stability of these medicines after reconstitution as reported on a data sheet report is 6 hours for Merrem and 1 hour for generics.
  
  
  OBJECTIVE
  The aim of this work was to evaluate the stability profile of 3 products in 0.9% sodium chloride until 6 hours.
  
  
  METHODS
  Six polyolefin bags (2 for each drug, stored in the light and in the dark) were prepared for every test run (n =10) at concentrations of 4 and 10 mg/mL. All solutions were stored at controlled room temperature (25°C ± 3°C) and sampled immediately after preparation and at every hour until 6 hours had passed. The concentrations, pH changes, and the visual clarity were used as stability and compatibility indicators.
  
  
  RESULTS
  All 3 drugs retained over 95% of the initial concentration at 3 to 4 hours. At the sixth hour, all the concentrations decayed 8% to 10%. No statistical differences were observed in the percentage deviation values of the stability profile between generics and the branded drug.
  
  
  CONCLUSIONS
  The stability profile of the products in polyolefin bags, at 4 and 10 mg/mL, was superimposable during the period of analysis and seems to show small values of deviation (1%-2%). These data do not affect the pharmacokinetics because these variations could be attributed to the intra- and interindividual variability between patients. The products showed the same stability, and consequently they could be used interchangeably in hospital pharmacy.
authors.affiliation: Hospital Pharmacy, Maria Vittoria, S.G. Bosco, and Amedeo di Savoia Hospitals, ASL TO2 , Turin, Italy.
authors.forename: Cristina
authors.initials: C
authors.lastname: Tomasello
authors.affiliation: Hospital Pharmacy, Maria Vittoria, S.G. Bosco, and Amedeo di Savoia Hospitals, ASL TO2 , Turin, Italy.
authors.forename: Anna
authors.initials: A
authors.lastname: Leggieri
authors.affiliation: Department of Medicine Science and Technology, University of Turin , Italy.
authors.forename: Roberta
authors.initials: R
authors.lastname: Cavalli
authors.affiliation: Departmental Director, Unit of Infectious Diseases, University of Turin , Turin, Italy ; Department of Medical Sciences, Amedeo di Savoia Hospital , Turin, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Di Perri
authors.affiliation: Department of Medical Sciences, Amedeo di Savoia Hospital , Turin, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: D'Avolio
keywords: UPLC-PDA; hospital pharmacy; meropenem; pharmacokinetic; stability