Oxazepam
Clinical data | |
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Trade names | Alepam, Generics |
Addiction liability | Low–moderate |
Routes of administration | Oral |
ATC code | |
Legal status | |
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Pharmacokinetic data | |
Bioavailability | 92.8% |
Metabolism | Hepatic (glucuronidation) |
Elimination half-life | 6–9 h[3][4][5] |
Excretion | Renal |
Identifiers | |
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JSmol) | |
Melting point | 205 to 206 °C (401 to 403 °F) |
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Oxazepam is a short-to-intermediate-acting benzodiazepine.[7][8] Oxazepam is used for the treatment of anxiety[9][10] and insomnia and in the control of symptoms of alcohol withdrawal syndrome.
It is a metabolite of
It was patented in 1962 and approved for medical use in 1964.[13]
Medical uses
It is an intermediate-acting benzodiazepine with a slow onset of action,
Side effects
The side effects of oxazepam are similar to those of other benzodiazepines, and may include dizziness, drowsiness, headache, memory impairment, paradoxical excitement, and anterograde amnesia, but does not affect transient global amnesia.[citation needed] Side effects due to rapid decrease in dose or abrupt withdrawal from oxazepam may include abdominal and muscle cramps, convulsions, depression, inability to fall asleep or stay asleep, sweating, tremors, or vomiting.[16]
In September 2020, the U.S. Food and Drug Administration (FDA) required the boxed warning be updated for all benzodiazepine medicines to describe the risks of abuse, misuse, addiction, physical dependence, and withdrawal reactions consistently across all the medicines in the class.[17]
Tolerance, dependence and withdrawal
Oxazepam, as with other benzodiazepine drugs, can cause tolerance, physical dependence, addiction, and benzodiazepine withdrawal syndrome. Withdrawal from oxazepam or other benzodiazepines often leads to withdrawal symptoms which are similar to those seen during alcohol and barbiturate withdrawal. The higher the dose and the longer the drug is taken, the greater the risk of experiencing unpleasant withdrawal symptoms. Withdrawal symptoms can occur, though, at standard dosages and also after short-term use. Benzodiazepine treatment should be discontinued as soon as possible by a slow and gradual dose reduction regimen.[18]
Contraindications
Oxazepam is contraindicated in
Special precautions
Benzodiazepines require special precautions if used in the elderly, during pregnancy, in children, alcohol- or drug-dependent individuals, and individuals with
Pregnancy
Oxazepam when taken during the
Interactions
As oxazepam is an active metabolite of diazepam, an overlap in possible interactions is likely with other drugs or food, with exception of the pharmacokinetic
Overdose
Oxazepam is generally less toxic in overdose than other benzodiazepines.
- Respiratory depression
- Excessive somnolence
- Altered consciousness
- Central nervous system depression
- Occasionally cardiovascular and pulmonary toxicity
- Rarely, deep coma
Pharmacology
Oxazepam is an intermediate-acting benzodiazepine of the 3-hydroxy family; it acts on
Oxazepam is an active metabolite formed during the breakdown of diazepam, nordazepam, and certain similar drugs. It may be safer than many other benzodiazepines in patients with impaired liver function because it does not require hepatic oxidation, but rather, it is simply metabolized by glucuronidation, so oxazepam is less likely to accumulate and cause adverse reactions in the elderly or people with liver disease. Oxazepam is similar to lorazepam in this respect.[31] Preferential storage of oxazepam occurs in some organs, including the heart of the neonate. Absorption by any administered route and the risk of accumulation is significantly increased in the neonate, and withdrawal of oxazepam during pregnancy and breast feeding is recommended, as oxazepam is excreted in breast milk.[32]
2 mg of oxazepam equates to 1 mg of diazepam according to the benzodiazepine equivalency converter, therefore 20 mg of oxazepam according to BZD equivalency equates to 10 mg of diazepam and 15 mg oxazepam to 7.5 mg diazepam (rounded up to 8 mg of diazepam).[33] Some BZD equivalency converters use 3 to 1 (oxazepam to diazepam), 1 to 3 (diazepam to oxazepam) as the ratio (3:1 and 1:3), so 15 mg of oxazepam would equate to 5 mg of diazepam.[34]
Chemistry
Oxazepam exists as a
Frequency of use
Oxazepam, along with diazepam, nitrazepam, and temazepam, were the four benzodiazepines listed on the pharmaceutical benefits scheme and represented 82% of the benzodiazepine prescriptions in Australia in 1990–1991.[37] It is in several countries the benzodiazepine of choice for novice users, due to a low chance of accumulation and a relatively slow absorption speed.[38]
Society and culture
Misuse
Oxazepam has the potential for misuse, defined as taking the drug to achieve a high, or continuing to take the drug in the long term against medical advice.[39] Benzodiazepines, including diazepam, oxazepam, nitrazepam, and flunitrazepam, accounted for the largest volume of forged drug prescriptions in Sweden from 1982 to 1986. During this time, a total of 52% of drug forgeries were for benzodiazepines, suggesting they were a major prescription drug class of abuse.[40]
However, due to its slow rate of absorption and its slow onset of action,[30] oxazepam has a relatively low potential for abuse compared to some other benzodiazepines, such as temazepam, flunitrazepam, or triazolam. This is similar to the varied potential for abuse between different drugs of the barbiturate class.[41]
Legal status
Oxazepam is a Schedule IV drug under the Convention on Psychotropic Substances.[42]
Brand names
It is marketed under many brand names worldwide, including: Alepam, Alepan, Anoxa, Anxiolit, Comedormir, durazepam, Murelax, Nozepam, Oksazepam, Opamox, Ox-Pam, Oxa-CT, Oxabenz, Oxamin, Oxapam, Oxapax, Oxascand, Oxaze, Oxazepam, Oxazépam, Oxazin, Oxepam, Praxiten, Purata, Selars, Serax, Serepax, Seresta, Séresta, Serpax, Sobril, Tazepam, Vaben, and Youfei.[43]
It is also marketed in combination with
Environmental concerns
In 2013, a laboratory study which exposed
On the other hand, a 2018 study from the same authors, which kept 480 European perch and 12 northern pikes in 12 ponds over 70 days, half of them control and half spiked with oxazepam, found no significant difference in either perch growth or mortality. However, it suggested that the latter could be explained by the exposed perch and pike being equally hampered by oxazepam, rather than the lack of an overall effect.[47] Lastly, a 2021 study built on these results by comparing two whole lakes filled with perch and pikes - one control while the other was exposed to oxazepam 11 days into experiment, at concentrations between 11 and 24 μg/L, which is 200 times greater than the reported concentrations in the European rivers. Even so, there were no measurable effects on pike behaviour after the addition of oxazepam, while the effects on perch behaviour were found to be negligible. The authors concluded that the effects previously attributed to oxazepam were instead likely caused by a combination of fish being stressed by human handling and small aquaria, followed by being exposed to a novel environment.[48]
References
- FDA. Retrieved 22 Oct 2023.
- ^ Anvisa (2023-03-31). "RDC Nº 784 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial" [Collegiate Board Resolution No. 784 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control] (in Brazilian Portuguese). Diário Oficial da União (published 2023-04-04). Archived from the original on 2023-08-03. Retrieved 2023-08-16.
- ^ Encadré 1. Anxiolytiques à demi-vie courte (< 20 heures) et sans métabolite actif par ordre alphabétique de DCI
- ^ S2CID 31007311.
- ^ PMID 2271373.
- ^ CID 4616 from PubChem
- ^ "Benzodiazepine Names". non-benzodiazepines.org.uk. Archived from the original on 2008-12-08. Retrieved 2008-12-29.
- ^ "FASS". Läkemedelsindustriföreningens Service AB. Archived from the original on 2011-10-01. Retrieved 2011-02-03.
- PMID 20034170.
- S2CID 44801451.
- ^ "Oxazepam (IARC Summary & Evaluation, Volume 66, 1996)". IARC. Archived from the original on 2008-09-07. Retrieved 2009-03-12.
- PMID 18855614. Archived from the originalon 2009-03-17.
- ISBN 9783527607495.
- ISBN 978-1-58562-276-4.
- ^ "Serax (oxazepam)" (PDF). Archived from the original (PDF) on 2011-07-15. Retrieved 2009-04-22.
- ^ "Oxazepam Uses, Side Effects & Warnings - Drugs.com". drugs.com. Archived from the original on 2009-06-04.
- ^ "FDA expands Boxed Warning to improve safe use of benzodiazepine drug". U.S. Food and Drug Administration (FDA). 23 September 2020. Retrieved 23 September 2020. This article incorporates text from this source, which is in the public domain.
- PMID 6133446.
- PMID 19900604.
- S2CID 27014006.
- PMID 7881198.
- PMID 7866122.
- S2CID 27619795.
- S2CID 43105029.
- PMID 6101526.
- PMID 6135616.
- PMID 2570451.
- ^ https://www.has-sante.fr/upload/docs/application/pdf/2011-11/mama_troubles_comportement_encadre_1_anxiolitiques.pdf[full citation needed]
- S2CID 29331503.
- ^ S2CID 46001278.
- S2CID 20789345.
- PMID 851373.
- ^ "benzo.org.uk : Benzodiazepine Equivalence Table".
- ^ "Benzodiazepine equivalent dosage converter". GlobalRPH. Retrieved 2019-09-21.
- PMID 3203421.
- ISBN 978-0849391408.
- PMID 7911332.
- ^ "Oxazepam".
- PMID 16336040.
- S2CID 19770310.
- S2CID 28209526.
- ^ "List of psychotropic substances under international control" (PDF). Vienna Austria: International Narcotics Control Board. August 2003. Archived (PDF) from the original on 2005-12-05. Retrieved 2005-11-19.
- ^ a b "Oxazepam - International Brand Names". Drugs.com. Archived from the original on 5 January 2017. Retrieved 4 January 2017.
- S2CID 38518537.
- PMID 27922016.
- S2CID 195065107.
- PMID 28988097.
- PMID 33663207.