Impact of morphine dependence and withdrawal on economic demand for fentanyl, cocaine, and methamphetamine in rats.
Seaman RW Jr; Shariatzadeh N; Salinas KA; George CM; Shi YG; Collins GT · 2026 · Drug and alcohol dependence
WASTE classifies this as Negative / Null Result Report · AI classification, approximate
The study found no significant effect — useful as a negative control or null benchmark for your own design.
Abstract (excerpt)
Background Stimulant-opioid co-use has surged in the United States, with methamphetamine use among people who use opioids increasing 82.6 % from 2015 to 2017. This trend contributes to rising overdose deaths, marking a "fourth wave" of the…
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Metadata source: Europe PMC · DOI 10.1016/j.drugalcdep.2025.112992