It would indeed be extraordinary if – alone among the neurotransmitter systems of the brain – the endogenous opioid families were immune from dysfunction. Enkephalins are critical to “basal hedonic tone” i.e. whether we naturally feel happy or sad. Yet the therapeutic implications of a recognition that dysfunctional endogenous opioid systems underlie a spectrum of anxiety-disorders and depression are too radical – at present – for the medical establishment to contemplate. In consequence, the use of opioid-based pharmacotherapies for “psychological” pain is officially taboo. The unique efficacy of opioids in banishing mental distress is neglected. Their unrivalled efficacy in treating “physical” nociceptive pain is grudgingly accepted. – Future Opioids, by David Pearce

Albert Camus wrote that the only serious question is whether to kill yourself or not. Tom Robbins wrote that the only serious question is whether time has a beginning and an end. Camus clearly got up on the wrong side of bed, and Robbins must have forgotten to set the alarm. There is only one serious question. And that is: Who knows how to make love stay? [emphasis mine] Answer me that and I will tell you whether or not to kill yourself. – Still Life with Woodpecker by Tom Robbins

As eloquently argued by David Pearce in Future Opioids, the problem with opioids and other euphoriant drugs is not that they make you feel good, but that the positive feelings are short lived. In their stead, tolerance, withdrawal, and dependence ultimately set in after repeated use. We take the position that these negatives are not a necessary outcome of feeling free from physical or psychological malaise, for the brain has clever negative feedback mechanisms that prevent us from wireheading chemically. Rather, we believe that tackling these negative feedback mechanisms directly might be they key that unlocks never-ending bliss. Note that even if excellent anti-tolerance drugs were to be developed and commercialized for therapeutic use, we would still need to find solutions to the problems posed by wireheading. Specifically, disabling the negative feedback mechanisms in place that prevent us from feeling well all the time still leaves unsolved the problem of avoiding getting stuck in counterproductive patterns of behavior and becoming at risk of turning into a pure replicator (for proposed solutions to these problems see: Wireheading Done Right). Still, we strongly believe that finding safe and effective anti-tolerance drugs is a step in the right direction in the battle against suffering throughout the living world.

We thus provide the following list of promising anti-tolerance drugs in the hopes of: (1) piquing the interest of budding psychopharmacologists who may be weighting-in on promising research leads, (2) show a proof of concept against the fake and fatalistic truism that “what goes up has to go down” (cf. The Hedonistic Imperative), and last but not least, (3) provide hope to people suffering from physical or psychological distress who would benefit from anti-tolerance drugs, such as those who experience treatment-resistant anxiety, depression, chronic pain, or chemical dependence.

It is worth noting that this list is just a draft, and we will continue to revise it as the science progresses. Please let us know in the comment section if you are aware of compounds not included in this list (of special interest are tier 1 and tier 2 compounds).

Tier System

The list is organized by tiers. Tier 1 includes compounds for which there is evidence that they can reverse tolerance. Tier 2 deals with compounds that seem to either block or attenuate the development of tolerance, meaning that co-administering them with a euphoric agonist reduces the speed at which this euphoriant creates tolerance. Tier 3 includes potentiators. That is, compounds that enhance the effects of other substances without at the same time increasing tolerance to the extent that would be expected given the intensity of the subjective effects. Tier 4 lists compounds that, while not exactly tolerance-related, are still worth mentioning by virtue of reducing the intensity of drug withdrawals. And finally, Tier 5 includes euphoriants that have a favorable pharmacological profile relative to their alternatives, although will still produce tolerance long-term. Typically, a substance belonging to Tier X will also belong to Tier X + 1 and above (except for Tier 5) but we omit repetitions to avoid redundancy (e.g. proglumide not only reverses tolerance, but prevents tolerance, is a potentiatior, and reduces withdrawals).

Opioid System

Tier 1

Tier 2

Tier 3

DXM (specially potentiates the analgesia, which may be of use for chronic pain sufferers) Hydroxyzine (beware of its effects on sufferers of Akathisia/Restless Legs Syndrome; also bad in the long term for one’s cognitive capacity) L-Tyrosine Magnesium (possibly tier 2 but only weakly so)

Tier 4

Tier 5

Tianeptine (its effects on the delta opioid receptor attenuates its tolerance when used in therapeutic doses) Mitragynine (thanks to its partial agonism rather than full agonism it is less dangerous in high doses relative to alternatives; specifically, mitragyne does not have dangerous respiratory depression properties on its own, so switching heroin addicts to it would arguably save countless lives)

GABA System

Tier 1

Tier 2

Tier 3

See also.

Dopamine System

Insufficient datapoints for a tier system. Here are the few promising leads:

See also.

Tanks to Adam Karlovsky for help compiling these lists.

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