The invention relates to formulations and methods for preventing and/or treating substance abuse, addiction, withdrawal symptoms, and anticipation associated with substance abuse. In particular the invention relates to formulations comprising at least one processed Morinda citrifolia L. product, and methods comprising the administration of at least one processed Morinda citrifolia L product to prevent and/or treat substance abuse, addiction, withdrawal symptoms, and anticipation associated with substance abuse in living organisms. Embodiments of the invention further comprise Morinda citrifolia based nutraceuticals and administration thereof to affect regulation of dopamine levels, inhibition of opioid receptors, inhibition of mu opioid receptors, inhibition of kappa opioid receptors, inhibition of delta opioid receptors, acting as NMDA antagonist, inhibition of sensitization of NMDA receptors, and/or acting as opiate antagonists.