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In low doses, methamphetamine can elevate mood, increase alertness, concentration and energy in fatigued individuals, reduce appetite, and promote weight loss.At higher doses, it can induce psychosis, breakdown of skeletal muscle, seizures and bleeding in the brain.The psychological effects of methamphetamine can include euphoria, dysphoria, changes in libido, alertness, apprehension and concentration, decreased sense of fatigue, insomnia or wakefulness, self-confidence, sociability, irritability, restlessness, grandiosity and repetitive and obsessive behaviors.The NF-κB-mediated neuroimmune response to methamphetamine use which results in the increased permeability of the blood–brain barrier arises through its binding at and activation of sigma receptors, the increased production of reactive oxygen species (ROS), reactive nitrogen species (RNS), and damage-associated molecular pattern molecules (DAMPs), the dysregulation of glutamate transporters (specifically, EAAT1 and EAAT2) and glucose metabolism, and excessive Ca Moreover, methamphetamine neurotoxicity is associated with an increased risk of Parkinson's disease, an effect which partially arises through excessive cytosolic and synaptic production of reactive oxygen species and autoxidation of dopamine.Excoriation disorder, or abnormal scratching and skin picking makes it an easy addiction to detect.According to the American Dental Association, meth mouth "is probably caused by a combination of drug-induced psychological and physiological changes resulting in xerostomia (dry mouth), extended periods of poor oral hygiene, frequent consumption of high-calorie, carbonated beverages and bruxism (teeth grinding and clenching)".In particular, methamphetamine appears to cause hyperintensity and hypertrophy of white matter, marked shrinkage of hippocampi, and reduced gray matter in the cingulate cortex, limbic cortex, and paralimbic cortex in recreational methamphetamine users.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.

These findings suggest that methamphetamine use and engagement in unprotected anal intercourse are co-occurring risk behaviors, behaviors that potentially heighten the risk of HIV transmission among gay and bisexual men.

Sigma receptor activation by methamphetamine promotes methamphetamine-induced neurotoxicity by facilitating hyperthermia, increasing dopamine synthesis and release, influencing microglial activation, and modulating apoptotic signaling cascades and the formation of reactive oxygen species.

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