Hyperthermia and convulsions can result in death. Ice is clear chunky crystals that resemble ice. All forms of methamphetamine are extremely dangerous and induce long-lasting, debilitating effects. Methamphetamine has a high potential for abuse and dependence. Side effects of methamphetamine use include irritability , nervousness , insomnia, nausea , hot flashes , dryness of the mouth, sweating, palpitations , and hypertension .
Excessive doses can produce mental confusion , severe anxiety , and paranoia .
Continued moderate to chronic use may lead to physical dependence and even death. Methamphetamine is a Schedule II drug under Federal regulations, meaning it has a high potential for abuse with severe liability to cause dependence. During World War II, methamphetamine was used by soldiers as an aid to fight fatigue and enhance performance. In Japan, intravenous methamphetamine abuse reached epidemic proportions immediately after World War II, when supplies stored for military use became available to the public. See Designer Drugs and Methamphetamine Analogs.