Prior medications are medications that a patient has taken before a current treatment or study period. Concomitant medications are medications that a patient is currently taking alongside a current treatment or during a study period.
In a clinical trial or other research study, it is important to track and record information about a patient's prior and concomitant medications, as these medications may have an effect on the results of the study. For example, if a patient is taking a medication that may interfere with the action of the study drug, this could affect the results of the study. Similarly, if a patient has previously taken a medication that may have an effect on the outcome of the study, this information could be relevant to the interpretation of the results.
So, the information related to prior and concomitant medications used by the trial participant is collected.