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Memantine produces modest reductions in heroin-induced subjective responses in human research volunteers

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Abstract

Rationale

Previous studies have demonstrated an interaction between opioids and noncompetitive antagonists at N-methyl-d-aspartate (NMDA) receptors, but few studies have examined the utility of these medications for treating opioid dependence.

Objective

In this 8-week inpatient study, participants were maintained on the low-affinity, noncompetitive NMDA receptor antagonist memantine (0, 30, and 60 mg per day, PO) and under each maintenance dose condition, the effects of intranasal heroin (0, 12.5, and 50 mg, IN) were examined.

Methods

During the first week after admission to the hospital, participants were detoxified from heroin. All of the volunteers received all of the memantine and heroin dose combinations. Participants (N = 8) first sampled a dose of heroin and $20. During a subsequent choice session, participants could self-administer heroin and/or money. Responses, which consisted of finger presses on a computer mouse, were made under a modified progressive ratio schedule (PR 50, 100, 200, 400, 800, 1,200, 1,600, 2,000, 2,400, and 2,800) during a ten-trial self-administration task. Subjective, performance, and physiological effects were measured repeatedly during laboratory sessions.

Results

Memantine produced modest reductions in subjective ratings of drug quality, liking, willingness to pay for the drug, and craving for heroin. However, memantine produced few changes in the reinforcing effects of heroin.

Conclusions

These data demonstrate that memantine was well tolerated and modestly effective in reducing the subjective but not the reinforcing effects of heroin. Although it is unlikely that memantine will be useful as a stand-alone maintenance medication for opioid dependence, it may have some utility as an adjunct treatment medication.

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Acknowledgments

The medical assistance of Janet Murray RN and Drs. Adam Bisaga, John Mariani, Benjamin Nordstrom, Shabnam Shakibaie, and Jeanne Manubay is gratefully acknowledged. The technical assistance of Mr. Chaim Kozlovsky also is appreciated. This research was supported by grant DA09236.

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Correspondence to Sandra D. Comer.

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Comer, S.D., Sullivan, M.A. Memantine produces modest reductions in heroin-induced subjective responses in human research volunteers. Psychopharmacology 193, 235–245 (2007). https://doi.org/10.1007/s00213-007-0775-2

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