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It is dispensed only by a physician's prescription. Legally, 2 grams of methylphenidate is classified as a small quantity, and 50 grams as a large or commercial quantity. [197] [198] New Zealand In New Zealand, methylphenidate is a "class B2 controlled substance".
Acidic substances reduce the absorption of amphetamine and increase urinary excretion, and alkaline substances do the opposite. [29] Due to the effect pH has on absorption, amphetamine also interacts with gastric acid reducers such as proton pump inhibitors and H 2 antihistamines , which increase gastrointestinal pH (i.e., make it less acidic).
New Zealand Customs and police officers continued to make large interceptions of precursor substances believed to be destined for methamphetamine production. On 9 October 2009, Prime Minister John Key announced pseudoephedrine-based cold and flu tablets would become prescription-only drugs and reclassified as a class B2 drug. [161]
As of 18 September 2020, France added phenibut to the controlled psychoactive substances list, prohibiting production, sale, storage, and use. [35] In the United States, phenibut is an unapproved drug, but is often misleadingly marketed as a dietary supplement. It is readily available without a prescription. [36] [37]
Barbituric acid, the parent structure of all barbiturates. Barbiturates [a] are a class of depressant drugs that are chemically derived from barbituric acid. [2] They are effective when used medically as anxiolytics, hypnotics, and anticonvulsants, but have physical and psychological addiction potential as well as overdose potential among other possible adverse effects.
Suvorexant is used for the treatment of insomnia, characterized by difficulties with sleep onset and/or sleep maintenance, in adults. [2] [6] At a dose of 15 to 20 mg and in terms of treatment–placebo difference, it reduces time to sleep onset by up to 10 minutes, reduces time awake after sleep onset by about 15 to 30 minutes, and increases total sleep time by about 10 to 20 minutes. [2]
Modafinil, sold under the brand name Provigil among others, is a central nervous system (CNS) stimulant and eugeroic (wakefulness promoter) medication used primarily to treat narcolepsy, [3] [8] [15] a sleep disorder characterized by excessive daytime sleepiness and sudden sleep attacks. [16]
Clomipramine, sold under the brand name Anafranil among others, is a tricyclic antidepressant (TCA). [7] It is used in the treatment of various conditions, most notably obsessive–compulsive disorder but also many other disorders, including hyperacusis, panic disorder, major depressive disorder, trichotillomania, [8] body dysmorphic disorder [9] [10] [11] and chronic pain. [7]