An intranasal composition comprising a dosage amount of 50-150 mg/ml 5-methoxy-N,N-dimethyltryptamine (5MeODMT) in a liquid medium, wherein the 5MeODMT is formulated as the chloride salt of 5MeODMT (5MeODMT hydrochloride) and wherein the 5MeODMT hydrochloride is crystalline and characterised by one or more of: peaks in an XRPD diffractogram; an endothermic event in a DSC thermograph; an onset of decomposition in a TGA thermograph; and a DVS isotherm profile.