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Background Stabilis ®  is an international database on stability and compatibility of drugs. The stability data comes mainly from publications of pharmaceutical journals. As the quality of the published stability studies is not equivalent, the objective of this work was to propose a level of evidence for the physico-chemical stability studies selected for the database. Methods At first, we evaluated the main pharmacological class consulted by the users. This work was then divided into 5 steps: (1) updating of the criteria to validate a stability study, (2) creating a grid rating articles, (3) rating of the articles of stability studies for anticancer, antifungal and antiviral drugs by 2 evaluators, (4) creation of new screens in the database to enter rating, to visualize the pictograms and commentaries by the users, (5) creation of a guideline to explain the different levels of evidence. Results The main pharmacological class consulted by Stabilis ®  users is the anticancer drugs and then antiinfectives. We have selected anticancer, antifungal and antiviral drugs for our study. Two hundred and forty publications were evaluated. The highest level attributed was A for anticancer and antifungal drugs and C for antiviral drugs. This difference can be explained by the fact that the majority of publications about antiviral drugs were older. The most frequent anomalies in the rating of articles were an incomplete or imperfect validation of the analytical method (high value of the coefficient of variation) and a defect in the evaluation of the stability indicating capacity. It must be noted that the level of evidence is not the quality level of the analytical method but the mixture of the quality of the method validation and of the results. This aspect was a choice of the Stabilis ®  team and seems important because the security of the patient is impacted by both aspects. Conclusions This new function contributes to help the Stabilis ®  users to evaluate the stability data published and to take a decision for their use in daily practice. This function will be progressively extended to other pharmacological classes of injectable drugs and then for non-injectable preparations.

Evolution of the Stabilis ® Database: Creation of a Level of Evidence for Stability Studies