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Both methamphetamine and dextromethamphetamine are illicitly trafficked and sold owing to their potential for recreational use.
The highest prevalence of illegal methamphetamine use occurs in parts of Asia, Oceania, and in the United States, where racemic methamphetamine, levomethamphetamine, and dextromethamphetamine are classified as schedule II controlled substances.
While dextromethamphetamine is a more potent drug, racemic methamphetamine is sometimes illicitly produced due to the relative ease of synthesis and limited availability of chemical precursors.
Chronic high-dose use can precipitate unpredictable and rapid mood swings, stimulant psychosis (e.g., paranoia, hallucinations, delirium, and delusions) and violent behavior.Once super high speed cameras were used to closely film animals drinking, it was initially thought that dogs bent their tongues backwards, like an inverted ladle - dipping down and scooping up water using its tongue as a pulley.Now that scientists have been able to measure exactly how they animals drink they have found that cats can take in more liquid with less spillage than dogs, in the same amount of time - making them more efficient at taking in fluid than dogs.Moreover, evidence suggests that adverse changes in the level of biomarkers of metabolic integrity and synthesis occur in recreational users, such as a reduction in N-acetylaspartate and creatine levels and elevated levels of choline and myoinositol.