Dextromethorphan (DXM), a common active ingredient found in many over-the-counter cough suppressant cold medicines, is used as a recreational drug and entheogen for its dissociative effects. It has almost no psychoactive effects at medically recommended doses. Dextromethorphan has powerful dissociative properties when administered in doses well above those considered therapeutic for cough suppression. Recreational use of DXM is sometimes referred to in slang form as "robo-tripping", whose prefix derives from the Robitussin brand name, or Triple Cs, which derives from the Coricidin brand (the pills were printed with "CCC" for "Coricidin Cough and Cold" However, this brand presents a danger when used at recreational doses due to the presence of Chlorpheniramine)
In over-the-counter formulations, DXM is often combined with acetaminophen (paracetamol, APAP) to relieve pain and to prevent recreational use; however, to achieve DXM's dissociative effects, the maximum daily therapeutic dose of 4000 mg of APAP is often exceeded, potentially causing acute or chronic liver failure, making abuse and subsequent tolerance of products which contain both DXM and APAP potentially fatal.
An online essay first published in 1995 entitled "The DXM FAQ" described dextromethorphan's potential for recreational use, and classified its effects into plateaus.
Owing to its recreational use and theft concerns, many retailers in the US have moved dextromethorphan-containing products behind the counter so that one must ask a pharmacist to receive them or be 18 years (19 in New York, Nebraska, Virginia, and Alabama, 21 in Mississippi) or older to purchase them. Some retailers also give out printed recommendations about the potential for abuse with the purchase of products containing dextromethorphan.
Classification
At high doses, dextromethorphan is classified as a dissociative general anesthetic and hallucinogen, similar to the controlled substances ketamine and phencyclidine (PCP). Also like those drugs, dextromethorphan is an NMDA receptor antagonist. Dextromethorphan generally does not produce withdrawal symptoms characteristic of physical dependence-inducing substances, but there have been cases of psychological dependence. Due to dextromethorphan's SSRI (selective serotonin re-uptake inhibitor)-like action, the sudden cessation of recreational dosing in tolerant individuals can result in mental and physical withdrawal symptoms similar to the withdrawal from SSRIs. These withdrawal effects can manifest as psychological effects, including depression, irritability, cravings, and as physical effects, including lethargy, body aches, and a sensation of unpleasant tingling, not unlike a mild "electric shock".
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Effects
Dextromethorphan's effects have been divided into four plateaus. The first plateau (1.5 to 2.5 mg/kg) is described as having euphoria, auditory changes, and change in perception of gravity. The second plateau (2.5 to 7.5 mg/kg) causes intense euphoria, vivid imagination, and closed-eye hallucinations may occur. The third and fourth plateaus (600 mg, or 7.5 mg/kg and over) cause profound alterations in consciousness, and users often report out-of-body experiences or temporary psychosis. Flanging (speeding up or slowing down) of sensory input is also a characteristic effect of recreational use.
There is also a marked difference between dextromethorphan hydrobromide, contained in most cough suppressant preparations, and dextromethorphan polistirex, contained in the brand name preparation Delsym. Polistirex is a polymer that is bonded to the dextromethorphan that requires more time for the stomach to digest it as it requires that an ion exchange reaction take place prior to its dissolution into the blood. Because of this, dextromethorphan polistirex takes considerably longer to absorb, resulting in more gradual and longer lasting effects reminiscent of time release pills. As a cough suppressant, the polistirex version lasts up to 12 hours. This duration also holds true when used recreationally.
In 1981, a paper by Gosselin estimated that the lethal dose is between 50 and 500 mg/kg. Doses as high as 15-20 mg/kg are taken by some recreational users. It is suggested by a single case study that the antidote to dextromethorphan overdose is naloxone, administered intravenously.
In addition to producing PCP-like mental effects, high doses may cause a false-positive result for PCP and opiates in some drug tests.
Risks associated with use
Dextromethorphan has not been shown to cause vacuolization in animals, also known as Olney's lesions, despite early speculation that it may, due to similarities with phencyclidine (PCP). In rats, oral administration of dextromethorphan did not cause vacuolization in laboratory tests. Oral administration of dextromethorphan repeatedly during adolescence, however, has been shown to impair learning in those rats during adulthood. The occurrence of Olney's lesions in humans, however, has not been proven or disproven. William E. White, author of the "DXM FAQ", has compiled informal research from correspondence with dextromethorphan users suggesting that heavy abuse may result in various deficits corresponding to the brain areas affected by Olney's lesions; these include loss of episodic memory, decline in ability to learn, abnormalities in some aspects of visual processing, and deficits of abstract language comprehension. In 2004, however, White retracted the article in which he made these claims.
A formal survey of dextromethorphan users showed that more than half of users reported experience of the following withdrawal-symptoms individually for the first week after long-term/addictive dextromethorphan use: fatigue, apathy, flashbacks, and constipation. Over a quarter reported insomnia, nightmares, anhedonia, impaired memory, attention deficit and decreased libido. Rarer side effects included panic attacks, impaired learning, tremor, jaundice, urticaria (hives) and myalgia. Frequent and long-term usage at very high doses could possibly lead to toxic psychosis and other permanent psychological problems. It is important to note than responsible DXM use has not been shown to cause the above issues.
Erectile dysfunction and diminished libido can be a longer-term effect (years to decades) of many narcotic analgesics due to development of central hypogonadism; this appears especially common in individuals with significant melanin deficiencies, as the hormones tied to melanin production affect the absorption and conversion of these analgesics into progesterone. Additionally, the haplotypes of about 48% of the indigenous population of Britain aggravate the condition, as the E647 sequence underwent epigenetic degradation and became a pseudogene. The chance of vulnerability is doubled for males, as the critical sequence is located on the X chromosome.
Misuse of multi-symptom cold medications, rather than using a cough suppressant whose sole active ingredient is dextromethorphan, carries significant risk of fatality or serious illness. Multi-symptom cold medicines contain other active ingredients, such as paracetamol (acetaminophen), chlorpheniramine, and phenylephrine, any of which can cause permanent bodily damage such as kidney failure, or even death, if taken on the generally accepted recreational dosing scale of dextromethorphan. Sorbitol, an artificial sweetener found in many cough syrups containing dextromethorphan, can also have negative side effects including diarrhea and nausea when taken at recreational dosages of dextromethorphan. Guaifenesin, an expectorant commonly accompanying dextromethorphan in cough preparations, can cause unpleasant symptoms including vomiting, nausea, and headache. Thus it is extremely important to use products which contain only DXM and no other active ingredients.
Combining dextromethorphan with other substances can compound risks. CNS stimulants such as amphetamine and/or cocaine can cause a dangerous rise in blood pressure and heart rate. CNS depressants such as ethanol (drinking alcohol) will have a combined depressant effect, which can cause a decreased respiratory rate. Combining dextromethorphan with other CYP2D6 substrates can cause both drugs to build to dangerous levels in the bloodstream.
Combining dextromethorphan with other serotonergic drugs could possibly cause serotonin toxicity, an excess of serotonergic activity in the central nervous system (CNS) and peripheral nervous system (PNS).
Pharmacology
Dextromethorphan's hallucinogenic and dissociative effects can be attributed largely to dextrorphan (DXO), a metabolite produced when dextromethorphan is metabolized by the body. Both dextrorphan and dextromethorphan are NMDA receptor antagonists, like the dissociative hallucinogenic drugs ketamine and phencyclidine (PCP), although dextrorphan is more potent than its "parent molecule" dextromethorphan.
As NMDA receptor antagonists, dextrorphan and dextromethorphan inhibit the excitatory amino acid and neurotransmitter glutamate in the brain. This can effectively slow, or even shut down certain neural pathways, preventing areas of the brain from communicating with each other. This leaves the user feeling dissociated or disconnected, experienced as brain fog or derealization.
Dextromethorphan's euphoric effects have sometimes been attributed to an increase in dopamine levels, since such an increase generally correlates with pleasurable responses to drug, as is observed with some clinical antidepressants, as well as some recreational drugs. However, the effects of dextrorphan and dextromethorphan, and other NMDA receptor antagonists, on dopamine levels is a disputed subject. Studies show that the NMDA receptor antagonists ketamine and PCP do raise dopamine levels, although other studies show that another NMDA receptor antagonist dizocilpine has no effect on dopamine levels. Some findings even suggest that dextromethorphan can actually counter the dopamine-increasing effect caused by morphine. Due to these conflicting results, the actual effect of dextromethorphan on dopamine levels remain undetermined.
Legality
Antitussive preparations containing dextromethorphan are legal to purchase from pharmacies in most countries, with some exceptions being UAE, Sweden, Estonia and Latvia.
In Russia, dextromethorphan (commonly sold under the brand names Tussin+ and Glycodin) is a Schedule III controlled substance and is placed in the same list as benzodiazepines and the majority of barbiturates.
United States
No legal distinction currently exists in the United States between medical and recreational use, sale, or purchase. Some states and store chains have implemented restrictions, such as requiring signatures for DXM sale, limiting quantities allowable for purchase, and requiring that purchasers be over the age of majority in their state.
The sale of dextromethorphan in its pure powder form may incur penalties, although no explicit law exists prohibiting its sale or possession, other than in the state of Illinois. There have been cases of individuals being sentenced to time in prison and other penalties for selling pure dextromethorphan in this form, because of the incidental violation of more general laws for the sale of legitimate drugs -- such as resale of a medication without proper warning labels.
Dextromethorphan was excluded from the Controlled Substances Act (CSA) of 1970 and was specifically excluded from the Single Convention on Narcotic Drugs. Dextromethorphan is still excluded from the CSA (as of 2010); however, officials have warned that it could still be added if increased abuse warrants its scheduling. The motivation behind its exclusion from the CSA was that, under the CSA, all optical isomers of listed Schedule II opiates are automatically Schedule II substances. Since dextromethorphan is an optical isomer of the Schedule II opiate levomethorphan (but does not act like an opiate), an exemption was necessary to keep it a non-controlled substance. The Federal Analog Act does not apply to dextromethorphan because a new drug application has been filed for it.
Indonesia
After previously available over the counter, The National Agency of Drug and Food Control of Republic of Indonesia (BPOM-RI) prohibit single component dextromethorphan drug sales with or without prescription. Indonesia is the only country in the world that makes single-component dextromethorphan illegal even by prescription and violators may be prosecuted by law. Indonesian National Narcotic Bureau (BNN RI) has even threatened to revoke pharmacies' and drug stores' licenses if they still stock dextromethorphan, and will notify the police for criminal prosecution. As a result of this regulation, 130 drugs have been withdrawn from the market, but drugs containing multicomponent dextromethorphan can be sold over the counter. In its official press release, BPOM-RI also stated that dextromethorphan is often used as a substitute for marijuana, amphetamine, and heroin by drug abusers, and its use as an antitussive is less beneficial nowadays
The Director of Narcotics, Psychotropics, and Addictive Substances Control (NAPZA) BPOM-RI, Dr. Danardi Sosrosumihardjo, SpKJ, explains that dextromethorphan, morphine, and heroin are derived from the same tree, and states the effect of dextromethorphan to be equivalent to 1/100 of morphine and injected heroin. By contrast, the Deputy of Therapeutic Product and NAPZA Supervision BPOM-RI, Dra. Antonia Retno Tyas Utami, Apt. MEpid., states that dextromethorphan, being chemically similar to morphine, has a much more dangerous and direct effect to the central nervous system, thus causing mental breakdown in the user. She also claimed, without citing any prior scientific study or review, that unlike morphine users, dextrometorphan users cannot be rehabilitated. This claim is contradicted by numerous scientific studies which show that naloxone alone offers effective treatment and promising therapy results in treating dextromethorphan addiction and poisoning. Dra. Antonia Retno Tyas Utami also claimed high rates of dextromethorphan abuse, including fatalities, in Indonesia and to be further put in question suggest that codeine, despite being a more physically addictive ยต-opioid class antitussive, be made available as an alternative to dextromethorphan.
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