One or more cannabinoids and/or terpenes in combination with psilocybin and/or psilocin may be used in the prevention or treatment of psychological or brain disorders. The one or more cannabinoids may be taken from the group of cannabidiol (CBD); cannabidiolic acid (CBDA); tetrahydrocannbidivarin (THCV); tetrahydrocannbidivarinin acid (THCVA); cannabichromene (CBC); cannabichromenic acid (CBCA); cannabigerol (CBG) and cannabigerolic acid (CBGA).