Abstract
Rationale
Despite the growing scientific interest on mitragynine, the primary alkaloid in kratom (Mitragyna Speciosa), there is a lack of clinical trials in humans.
Objectives
This phase 1 study aimed to evaluate mitragynine’s safety profile and acute effects on subjective drug experience, neurocognition, and pain tolerance.
Methods
A placebo-controlled, single-blind, within-subjects study was conducted in two parts. In part A, eight healthy human volunteers received placebo and three doses of mitragynine (5, 10, and 20 mg) in a sequential dosing scheme, on separate days. In part B, a second group of seven volunteers received placebo and 40 mg of mitragynine. Vital signs, subjective drug experience, neurocognitive function, and pain tolerance were measured at regular intervals for 7 h after administration.
Results
Overall, mitragynine did not affect most of the outcome measures at any dose. Yet, the lowest dose (5 mg) of mitragynine increased subjective ratings of arousal and attention, accuracy in a sustained attention task, and motor inhibition. The highest dose (40 mg) of mitragynine increased subjective ratings of amnesia and produced mild psychopathological symptoms. Mitragynine did not significantly affect vital signs, and only mild, transient side effects were reported.
Conclusion
The present study suggests that low doses (5–10 mg) of mitragynine may cause subjective feelings of stimulation and enhance attention, while the highest dose (40 mg) may cause inhibitory feelings of amnesia and distress. Mitragynine doses up to 40 mg were well tolerated in this group.
Despite the growing scientific interest on mitragynine, the primary alkaloid in kratom (Mitragyna Speciosa), there is a lack of clinical trials in humans.
Objectives
This phase 1 study aimed to evaluate mitragynine’s safety profile and acute effects on subjective drug experience, neurocognition, and pain tolerance.
Methods
A placebo-controlled, single-blind, within-subjects study was conducted in two parts. In part A, eight healthy human volunteers received placebo and three doses of mitragynine (5, 10, and 20 mg) in a sequential dosing scheme, on separate days. In part B, a second group of seven volunteers received placebo and 40 mg of mitragynine. Vital signs, subjective drug experience, neurocognitive function, and pain tolerance were measured at regular intervals for 7 h after administration.
Results
Overall, mitragynine did not affect most of the outcome measures at any dose. Yet, the lowest dose (5 mg) of mitragynine increased subjective ratings of arousal and attention, accuracy in a sustained attention task, and motor inhibition. The highest dose (40 mg) of mitragynine increased subjective ratings of amnesia and produced mild psychopathological symptoms. Mitragynine did not significantly affect vital signs, and only mild, transient side effects were reported.
Conclusion
The present study suggests that low doses (5–10 mg) of mitragynine may cause subjective feelings of stimulation and enhance attention, while the highest dose (40 mg) may cause inhibitory feelings of amnesia and distress. Mitragynine doses up to 40 mg were well tolerated in this group.
| Original language | English |
|---|---|
| Number of pages | 14 |
| Journal | Psychopharmacology |
| Early online date | 26 Dec 2024 |
| DOIs | |
| Publication status | E-pub ahead of print - 26 Dec 2024 |