Clinical trials may include reimbursement for the time and commitment of participants, as well as travel expenses for required visits. The amount can vary, depending on the condition being investigated, the length of time of visits and the type of treatment, this will usually be discussed after registering your interest. It is important volunteers fully understand the commitment and any risks involved in a clinical and these will be discussed at numerous stages with participants, only those eligible to participate in a clinical trial will receive any payments applicable.