Salvia divinorum: from recreational hallucinogenic use to analgesic and anti-inflammatory action

Salvia divinorum is a herbal plant native to the southwest region of Mexico. Traditional preparations of this plant have been used in illness treatments that converge with inflammatory conditions and pain. Currently, S. divinorum extracts have become popular in several countries as a recreational drug due to its hallucinogenic effects. Its main active component is a diterpene named salvinorin A (SA), a potent naturally occurring hallucinogen with a great affinity to the κ opioid receptors and with allosteric modulation of cannabinoid type 1 receptors. Recent biochemical research has revealed the mechanism of action of the anti-inflammatory and analgesic effect of SA at the cellular and molecular level. Nevertheless, because of their short-lasting and hallucinogenic effect, the research has focused on discovering a new analogue of SA that is able to induce analgesia and reduce inflammation with a long-lasting effect but without the hallucinatory component. In this review, we explore the role of S. divinorum, SA and its analogues. We focus mainly on their analgesic and anti-inflammatory roles but also mention their psychoactive properties.

Can new psychoactive substances be regulated effectively? An assessment of the British Psychoactive Substances Bill

The regulation of new psychoactive substances (NPS) has confounded governments throughout the western world. In 2014 the UK government convened an NPS Review Expert Panel to consider a range of approaches. Ultimately the Panel recommended that the government ban all new psychoactive drugs and allow only psychoactive substances specifically exempted, such as alcohol, tobacco and those allowed as medicines. The government introduced the Psychoactive Substances Bill (PSB) in response to that recommendation. Passed in 2016, the Bill has attracted a torrent of criticism from scientists and experts. The Bill could be improved with revision, but the problems of the total ban, as envisioned by the PSB, with respect to the NPS, may be inherent: (1) defining psychoactivity is conceptually fraught, with great consequence for the scope of the prohibition; (2) operationalizing psychoactivity as a usable concept for legal control purposes is extremely difficult, perhaps impossible; and (3) the detachment of penalties for violating a total ban from establishing the harmfulness of a substance is normatively troubling. Given the uncertainties about the effects of a total ban, it is appropriate at this time for other governments to assess more fully the nature of the NPS problem, and the potential control approaches.