Stakeholders are urging the US Food and Drug Administration (FDA) to be flexible in how it regulates psychedelic drugs that may help treat conditions such as major depressive disorder (MDD) and post-traumatic stress disorder (PTSD). The agency should be careful not to create unnecessary barriers to patient access, promote proper training and credentialing, and allow flexibility in updating labeling as additional knowledge becomes available, according to individuals and groups that commented via a public docket.