Each study is unique with its own individual criteria. The criteria may state that certain medications are not permitted whilst on the study. However, other studies may state that you need to be currently taking a certain medication in order to be eligible. If you are on a restricted medication, but you want to take part in a study, it may be possible to come off your medication. We would advise that you speak to your GP about the study before making this decision, and there may be a washout period after you stop your medication before you can start the study. Please speak to our Patient Recruitment team for more information. Please be advised that we put you, the patient, first. If we feel that by ceasing your current medication you are compromising your safety or well-being in anyway, we will be unable to enroll you on the study.