It is only recommended for short-term use (~6 weeks) in treatment-resistant obesity patients because it is thought that the anorectic effects of the drug are short-lived and produce tolerance quickly, whereas the effects on CNS stimulation are much less susceptible to tolerance. It is considered a second line of treatment, used when amphetamine and methylphenidate cause the patient too many side effects. Narcolepsy and obesity can also be treated by the aforementioned isomer under the brand name Desoxyn. The dextrorotatory (S-isomer) dextromethamphetamine can be prescribed to treat attention-deficit hyperactivity disorder, though unmethylated amphetamine is more commonly prescribed. Over-the-counter drug and used in inhalers for nasal decongestion and does not possess the CNS activity of dextro or racemic methamphetamine. The levorotary (R-isomer) levomethamphetamine is an It is a member of the family of phenylethylamines. Methamphetamine (also known as methylamphetamine, N-methylamphetamine or desoxyephedrine) is a powerful psychostimulant and sympathomimetic drug.
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