The order instructs the US Food and Drug Administration to expedite review of drugs such as ibogaine, a drug that US military veteran groups have said can help treat post-traumatic stress disorder.

At an event in the Oval Office, US federal officials said that the reforms would pave the way for the drugs, which can cause hallucinations and are largely illegal, to be reclassified after successful clinical trials. Trump also said the US would dedicate US$50 million to federal research into ibogaine.

Health Secretary ​Robert F. Kennedy Jr. has championed the idea of using drugs such as ibogaine as an alternative treatment for mental health conditions such as depression.

US Food and Drug Administration Commissioner Marty Makary on Saturday said that decisions on the drugs could come as soon as this summer.