Ketamine has a reputation as a party drug but a handful of clinics in the UK now legally offer it as a treatment for the most severe types of depression.
BBC Like Minds meets two patients who have regular infusions, as all other treatments have failed.
Filmed and edited by Kayleen Devlin and Alvaro A. Ricciardelli
Produced by Kayleen Devlin
Executive producer Camila Ruz
18 Nov 2018