OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Development of MedicinesIn an open-label trial, participants and doctors know which treatment is being given. In a blind trial, the participant does not know whether they receive the medicine or a comparison treatment. In a double-blind trial, neither the participant nor the doctor assessing them knows the allocation while the trial is under way.