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“Additionally, although caffeine shares stimulus functions with d-amphetamine , it does so under limited conditions and should be considered to have a relatively lower dependence potential.”
Pharmacology Biochemistry and Behavior • 1984 | View Paper
“Intraperitoneal injection of water or d-amphetamine exacerbates this effect, while caffeine has a modest antagonistic effect.”
“The combination of caffeine and d-amphetamine is synergistic and leads to a rapid loss in body temperature with death occurring in less than 3 hours.”