Dexamethasone

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Dexamethasone
Skeletal formula of dexamethasone
Ball-and-stick model of the dexamethasone molecule
Names
Trade namesDextenza, Ozurdex, others
  • (8S,9R,10S,11S,13S,14S,16R,17R)-9-Fluoro-11,17-dihydroxy-17-(2-hydroxyacetyl)-10,13,16-trimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-3-one
Clinical data
Pregnancy
category
  • AU: A(by mouth); C (by injection)[1]
  • US: C (Risk not ruled out)[1]
Routes of
use		By mouth, intravenous therapy (IV), intramuscular injection (IM), subcutaneous injection (IM), intraosseous (IO), eye drop
Defined daily dose1.5 mg[2]
External links
AHFS/Drugs.comSystemic: Monograph
Eye and ear: Monograph
MedlinePlusa682792
Legal
License data
Legal status
  • AU: S4 (Prescription only)
  • CA: ℞-only
  • UK: POM (Prescription only)
  • US: ℞-only
  • In general: ℞ (Prescription only)
Pharmacokinetics
Bioavailability80–90%
Protein binding77%
MetabolismLiver
Elimination half-life190 minutes (3.2 hours)
ExcretionUrine (65%)
Chemical and physical data
FormulaC22H29FO5
Molar mass392.461 g·mol−1
3D model (JSmol)
Melting point262 °C (504 °F)
  • O=C(CO)[C@]3(O)[C@]2(C[C@H](O)[C@]4(F)[C@@]1(C(=CC(=O)C=C1)CC[C@H]4[C@@H]2C[C@H]3C)C)C
  • InChI=1S/C22H29FO5/c1-12-8-16-15-5-4-13-9-14(25)6-7-19(13,2)21(15,23)17(26)10-20(16,3)22(12,28)18(27)11-24/h6-7,9,12,15-17,24,26,28H,4-5,8,10-11H2,1-3H3/t12-,15+,16+,17+,19+,20+,21+,22+/m1/s1 checkY
  • Key:UREBDLICKHMUKA-CXSFZGCWSA-N checkY

Dexamethasone is a type of corticosteroid medication.[3] It is used in the treatment of many conditions, including rheumatic problems, a number of skin diseases, severe allergies, asthma, chronic obstructive lung disease, croup, brain swelling, eye pain following eye surgery, and along with antibiotics in tuberculosis.[3] In adrenocortical insufficiency, it should be used together with a medication that has greater mineralocorticoid effects such as fludrocortisone.[3] In preterm labor, it may be used to improve outcomes in the baby.[3] It may be taken by mouth, as an injection into a muscle, or intravenously.[3] The effects of dexamethasone are frequently seen within a day and last for about three days.[3]

The long-term use may result in thrush, bone loss, cataracts, easy bruising, or muscle weakness.[3] It has been frequently used by mouth in pregnancy and not been found to cause problems for the baby.[4] It should not be taken when breastfeeding.[3] Dexamethasone has anti-inflammatory and immunosuppressant effects.[3]

Dexamethasone was first made in 1957 and was approved for medical use in 1961.[5][6] It is on the World Health Organization's List of Essential Medicines.[7] Dexamethasone is not expensive.[8] In the United States, a month of medication typically costs less than US$25.[3] In India, a course of treatment for preterm labor costs about US$0.5.[8] It is available in most areas of the world.[8] In 2017, it was the 321st most commonly prescribed medication in the United States, with more than one million prescriptions.[9]

Medical uses

Dexamethasone phosphate injection vials
A single vial of dexamethasone phosphate for injection

Anti-inflammatory

Dexamethasone is used to treat many inflammatory and autoimmune conditions, such as rheumatoid arthritis and bronchospasm.[10] Idiopathic thrombocytopenic purpura, a decrease in numbers of platelets due to an immune problem, responds to 40 mg daily for four days; it may be administered in 14-day cycles. It is unclear whether dexamethasone in this condition is significantly better than other glucocorticoids.[11]

It is also given in small amounts[12] before and/or after some forms of dental surgery, such as the extraction of the wisdom teeth, an operation which often leaves the patient with puffy, swollen cheeks.

Dexamethasone is commonly given as a treatment for croup in children, as a single dose can reduce the swelling of the airway to improve breathing and reduce discomfort.[13]

It is injected into the heel when treating plantar fasciitis, sometimes in conjunction with triamcinolone acetonide.

It is useful to counteract allergic anaphylactic shock, if given in high doses.

It is present in certain eye drops – particularly after eye surgery – and as a nasal spray, and certain ear drops (can be combined with an antibiotic and an antifungal). Dexamethasone intravitreal steroid implants have been approved by the FDA to treat ocular conditions such as diabetic macular edema, central retinal vein occlusion, and uveitis.[14] Dexamethasone has also been used with antibiotics to treat acute endophthalmitis.[15]

Dexamethasone is used in transvenous screw-in cardiac pacing leads to minimize the inflammatory response of the myocardium. The steroid is released into the myocardium as soon as the screw is extended and can play a significant role in minimizing the acute pacing threshold due to the reduction of inflammatory response. The typical quantity present in a lead tip is less than 1.0 mg.

Dexamethasone may be administered before antibiotics in cases of bacterial meningitis. It acts to reduce the inflammatory response of the body to the bacteria killed by the antibiotics (bacterial death releases proinflammatory mediators that can cause a response which is harmful), thus reducing hearing loss and neurological damage.[16]

Cancer

a) Extensive mucosal erythema b) gastric ulcer with bleeding spot at antrum c) 2 weeks of high-dose dexamethasone d) four cycles of high-dose dexamethasone, a healed ulcer scar

People with cancer undergoing chemotherapy are often given dexamethasone to counteract certain side effects of their antitumor treatments. Dexamethasone can increase the antiemetic effect of 5-HT3 receptor antagonists, such as ondansetron.[17] The exact mechanism of this interaction is not well-defined, but it has been theorized that this effect may be due to, among many other causes, inhibition of prostaglandin synthesis, anti-inflammatory effects, immunosuppressive effects, decreased release of endogenous opioids, or a combination of the aforementioned.[18]

In brain tumors (primary or metastatic), dexamethasone is used to counteract the development of edema, which could eventually compress other brain structures. It is also given in cord compression, where a tumor is compressing the spinal cord.

Dexamethasone is also used as a direct chemotherapeutic agent in certain hematological malignancies, especially in the treatment of multiple myeloma, in which dexamethasone is given alone or in combination with other chemotherapeutic drugs, including most commonly with thalidomide (Thal-dex), lenalidomide, bortezomib (Velcade, Vel-dex),[19] or a combination of doxorubicin (Adriamycin) and vincristine or bortezomib/lenalidomide/dexamethasone.

COVID-19

Dexamethasone treatment is recommended by the National Institutes of Health (NIH) in the US, and by the National Health Service in the UK, for people with COVID-19 who who require supplemental oxygen or are mechanically ventilated.[20][21] Dexamethasone has not been recommended in people with COVID-19 who do not require supplemental oxygen or hospitalization,[20] and the NIH recommends against such use.[21]

The Infectious Diseases Society of America (IDSA) guideline panel suggests the use of glucocorticoids for patients with severe COVID-19 where severe is defined as patients with SpO2 ≤94% on room air, and those who require supplemental oxygen, mechanical ventilation, or ECMO.[22] The IDSA recommends against the use of glucocorticoids for those with COVID-19 without hypoxemia requiring supplemental oxygen.[22]

Endocrine

Dexamethasone is the treatment for the very rare disorder of glucocorticoid resistance.[23][24]

In adrenal insufficiency and Addison's disease, dexamethasone is prescribed when the patient does not respond well to prednisone or methylprednisolone.

It can be used in congenital adrenal hyperplasia in older adolescents and adults to suppress ACTH production. It is typically given at night.[25]

Pregnancy

Dexamethasone may be given to women at risk of delivering prematurely to promote maturation of the fetus' lungs. This administration, given from day to one week before delivery, has been associated with low birth weight, although not with increased rates of neonatal death.[26]

Dexamethasone has also been used during pregnancy as an off-label prenatal treatment for the symptoms of congenital adrenal hyperplasia (CAH) in female babies. CAH causes a variety of physical abnormalities, notably ambiguous genitalia. Early prenatal CAH treatment has been shown to reduce some CAH symptoms, but it does not treat the underlying congenital disorder. This use is controversial: it is inadequately studied, only around one in ten of the fetuses of women treated are at risk of the condition, and serious adverse events have been documented.[27] Experimental use of dexamethasone in pregnancy for fetal CAH treatment was discontinued in Sweden when one in five cases suffered adverse events.[28]

A small clinical trial found long-term effects on verbal working memory among the small group of children treated prenatally, but the small number of test subjects means the study cannot be considered definitive.[29][30]

High-altitude illnesses

Dexamethasone is used in the treatment of high-altitude cerebral edema (HACE), as well as high-altitude pulmonary edema (HAPE). It is commonly carried on mountain-climbing expeditions to help climbers deal with complications of altitude sickness.[31][32]

Nausea and vomiting

Intravenous dexamethasone is effective for prevention of nausea and vomiting in people who had surgery and whose post-operative pain was treated with long-acting spinal or epidural spinal opioids.[33]

The combination of dexamethasone and a 5-HT3 receptor antagonist such as ondansetron is more effective than a 5-HT3 receptor antagonist alone in preventing postoperative nausea and vomiting.[34]

Dexamethasone, when used as an anti emetic during surgery, does not appear to increase rates of wound infection and it is unclear if it has an effect on wound healing.[35]

Sore throat

A single dose of dexamethasone or another steroid speeds improvement of a sore throat.[36]

Dosage

The defined daily dose is 1.5 mg by mouth or by injection.[2] For anaphylaxis in adults typically a one time dose of 10 mg either by mouth or by injection is used.[37] In children the typical dose is typically 0.6 mg/kg.[37]

For inflammatory syndromes as a result of infection 0.5 to 24 mg a day may be used in adults and 0.2 to 0.4 mg/kg in children.[38] To speed the development of a babies lungs 6 mg by injection into a muscle twice per day for two days may be used during pregnancy.[38]

For altitude sickness a dose of 4 mg every 6 hours may be used.[39] Generally this is only needed for a day or two when used together with descending.[39]

The recommended dose for severe COVID19 is 6 mg by mouth or intravenously a day for 7 to 10 days.[40]

Contraindications

Contraindications of dexamethasone include,[41][42] but are not limited to:

Side effects

The exact rates of side effects of dexamethasone are not available, hence estimates have been made as to the incidence of the adverse effects below based on the adverse effects of related corticosteroids and on available documentation on dexamethasone.[42][43][44][45][46]

Common

  • Acne
  • Insomnia
  • Vertigo
  • Increased appetite
  • Weight gain
  • Impaired skin healing
  • Depression
  • Euphoria
  • Hypertension
  • Increased risk of infection
  • Raised intraocular pressure
  • Vomiting
  • Dyspepsia
  • Confusion
  • Amnesia
  • Irritability
  • Nausea
  • Malaise
  • Headaches
  • Cataract (in cases of long-term treatment it occurs in about 10% of patients)

Unknown frequency

Withdrawal

Sudden withdrawal after long-term treatment with corticosteroids can lead to:[42]

Interactions

Known drug interactions include:[42]

Pharmacology

As a glucocorticoid, dexamethasone is an agonist of the glucocorticoid receptor (GR). It has minimal mineralocorticoid activity.[47][48][49]

Chemistry

Dexamethasone is a synthetic pregnane corticosteroid and derivative of cortisol (hydrocortisone) and is also known as 1-dehydro-9α-fluoro-16α-methylhydrocortisone or as 9α-fluoro-11β,17α,21-trihydroxy-16α-methylpregna-1,4-diene-3,20-dione.[50][51] The molecular and crystal structure of dexamethasone has been determined by X-ray crystallography.[52]

Synthesis

To synthesize dexamethasone, 16β-methylprednisolone acetate is dehydrated to the 9,11-dehydro derivative.[53][54] This is then reacted with a source of hypobromite, such as basic N-bromosuccinimide, to form the 9α-bromo-11β-hydrin derivative, which is then ring-closed to an epoxide. A ring-opening reaction with hydrogen fluoride in tetrahydrofuran gives dexamethasone.[citation needed]

Dexamethasone synthesis

History

Dexamethasone was first synthesized in 1957 by Philip Showalter Hench.[5][55] It was introduced for medical use in 1958.[48]

On 16 June 2020, the RECOVERY Trial announced preliminary results stating that dexamethasone improves survival rates of hospitalized patients with COVID-19 receiving oxygen or on a ventilator. Benefits were only observed in patients requiring respiratory support; those who did not require breathing support saw a worse survival rate than the control group, although the difference may have been due to chance.[56] A preprint containing the full dataset was published on 22 June 2020 and demand for dexamethasone surged after publication of the preprint.[57] The preliminary report was published in The New England Journal of Medicine on 18 July 2020.[58]

The World Health Organization (WHO) states that dexamethasone should be reserved for seriously ill and critical patients receiving COVID-19 treatment in a hospital setting,[59] and the WHO Director-General stated that "WHO emphasizes that dexamethasone should only be used for patients with severe or critical disease, under close clinical supervision. There is no evidence this drug works for patients with mild disease or as a preventative measure, and it could cause harm."[60] In July 2020, the WHO stated they are in the process of updating treatment guidelines to include dexamethasone or other steroids.[61]

In July 2020, the European Medicines Agency (EMA) started reviewing results from the RECOVERY study arm that involved the use of dexamethasone in the treatment of patients with COVID-19 admitted to the hospital to provide an opinion on the results and in particular the potential use of dexamethasone for the treatment of adults with COVID-19.[62][63]

Society and culture

Cost

Dexamethasone is inexpensive.[8] In the United States a month of medication is typically priced less than US$25.[3] In India, a course of treatment for preterm labor is about US$0.50.[8] The drug is available in most areas of the world.[8]

  • Dexamethasone costs (US)

    Dexamethasone costs (US)

  • Dexamethasone prescriptions (US)

    Dexamethasone prescriptions (US)

Route

It may be taken by mouth, as a tablet or elixir, as an injection into a muscle, intravenously, or via an eye drop.[3]

Nonmedical use

Dexamethasone is given in legal Bangladesh brothels to prostitutes not yet of legal age, causing weight gain aimed at making them appear older and healthier to customers and police.[64]

Dexamethasone and most glucocorticoids are banned by sporting bodies including the World Anti-Doping Agency.[65]

Veterinary use

Combined with marbofloxacin and clotrimazole, dexamethasone is available under the name Aurizon, CAS number 115550-35-1, and used to treat difficult ear infections, especially in dogs. It can also be combined with trichlormethiazide to treat horses with swelling of distal limbs and general bruising.[66]

See also

References

  1. ↑ 1.0 1.1 Cite error: Invalid <ref> tag; no text was provided for refs named Drugs.com pregnancy
  2. ↑ 2.0 2.1 "WHOCC - ATC/DDD Index". www.whocc.no. Archived from the original on 22 September 2020. Retrieved 1 September 2020.
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 "Dexamethasone". The American Society of Health-System Pharmacists. Archived from the original on 31 August 2017. Retrieved 29 July 2015.
  4. ↑ "Prescribing medicines in pregnancy database". Australian Government. 3 March 2014. Archived from the original on 8 April 2014. Retrieved 22 April 2014. Drugs which have been taken by a large number of pregnant women and women of childbearing age without any proven increase in the frequency of malformations or other direct or indirect harmful effects on the fetus having been observed.
  5. ↑ 5.0 5.1 Rankovic, Zoran; Hargreaves, Richard; Bingham, Matilda (2012). Drug discovery and medicinal chemistry for psychiatric disorders. Cambridge: Royal Society of Chemistry. p. 286. ISBN 9781849733656. Archived from the original on 5 March 2016.
  6. ↑ Fischer, Jnos; Ganellin, C. Robin (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 485. ISBN 9783527607495. Archived from the original on 1 August 2020. Retrieved 17 June 2020.
  7. ↑ World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 "DEXAMETHASONE FOR ACCELERATING LUNG MATURATION IN PRETERM BABIES" (PDF). Archived (PDF) from the original on 22 December 2015. Retrieved 29 July 2015.
  9. ↑ "Dexamethasone - Drug Usage Statistics". ClinCalc. Archived from the original on 12 April 2020. Retrieved 11 April 2020.
  10. ↑ Till, John. "Paramedic Clinical Training Aid". Archived from the original on 31 March 2012. Retrieved 30 August 2011.
  11. ↑ Provan D, Stasi R, Newland AC, Blanchette VS, Bolton-Maggs P, Bussel JB, et al. (January 2010). "International consensus report on the investigation and management of primary immune thrombocytopenia". Blood. 115 (2): 168–86. doi:10.1182/blood-2009-06-225565. PMID 19846889.
  12. ↑ Schmelzeisen R, Frölich JC (1993). "Prevention of postoperative swelling and pain by dexamethasone after operative removal of impacted third molar teeth". European Journal of Clinical Pharmacology. 44 (3): 275–7. doi:10.1007/BF00271371. PMID 8491244. S2CID 12528750. Archived from the original on 24 June 2020. Retrieved 17 June 2020.
  13. ↑ "Croup- Diagnosis & Treatment". Mayo Clinic. Archived from the original on 10 October 2017. Retrieved 13 October 2017. Dexamethasone is usually recommended because of its long-lasting effects (up to 72 hours).
  14. ↑ Brady CJ, Villanti AC, Law HA, Rahimy E, Reddy R, Sieving PC, et al. (February 2016). "Corticosteroid implants for chronic non-infectious uveitis". Cochrane Database of Systematic Reviews. 2: CD010469. doi:10.1002/14651858.CD010469.pub2. PMC 5038923. PMID 26866343.
  15. ↑ Kim CH, Chen MF, Coleman AL (February 2017). "Adjunctive steroid therapy versus antibiotics alone for acute endophthalmitis after intraocular procedure". Cochrane Database of Systematic Reviews. 2: CD012131. doi:10.1002/14651858.CD012131.pub2. PMC 5419424. PMID 28225198.
  16. ↑ Brouwer MC, McIntyre P, Prasad K, van de Beek D (September 2015). "Corticosteroids for acute bacterial meningitis". Cochrane Database of Systematic Reviews (9): CD004405. doi:10.1002/14651858.CD004405.pub5. PMC 6491272. PMID 26362566.
  17. ↑ Roila F, Ballatori E, Ruggeri B, DeAngelis V (May 2000). "Dexamethasone alone or in combination with ondansetron for the prevention of delayed nausea and vomiting induced by chemotherapy". The New England Journal of Medicine. 342 (21): 1554–9. doi:10.1056/NEJM200005253422102. PMID 10824073.
  18. ↑ Holte K, Kehlet H (November 2002). "Perioperative single-dose glucocorticoid administration: pathophysiologic effects and clinical implications". Journal of the American College of Surgeons. 195 (5): 694–712. doi:10.1016/s1072-7515(02)01491-6. PMID 12437261.
  19. ↑ Harousseau JL, Attal M, Leleu X, Troncy J, Pegourie B, Stoppa AM, et al. (November 2006). "Bortezomib plus dexamethasone as induction treatment prior to autologous stem cell transplantation in patients with newly diagnosed multiple myeloma: results of an IFM phase II study". Haematologica. 91 (11): 1498–505. PMID 17043025. Free to read
  20. ↑ 20.0 20.1 "Dexamethasone and COVID-19". SPS - Specialist Pharmacy Service. Archived from the original on 22 July 2020. Retrieved 22 July 2020.
  21. ↑ 21.0 21.1 "Dexamethasone | Coronavirus Disease COVID-19". COVID-19 Treatment Guidelines. National Institutes of Health. Archived from the original on 7 July 2020. Retrieved 12 July 2020.
  22. ↑ 22.0 22.1 "COVID-19 Guideline, Part 1: Treatment and Management". Infectious Diseases Society of America. Archived from the original on 6 October 2020. Retrieved 22 July 2020. Recommendation 4. Among hospitalized patients with severe* COVID-19, the IDSA guideline panel suggests glucocorticoids rather than no glucocorticoids. (Conditional recommendation, Moderate certainty of evidence)
    Remark: Dexamethasone 6 mg IV or PO for 10 days (or until discharge if earlier) or equivalent glucocorticoid dose may be substituted if dexamethasone unavailable. Equivalent total daily doses of alternative glucocorticoids to dexamethasone 6 mg daily are methylprednisolone 32 mg and prednisone 40 mg.
    Recommendation 5. Among hospitalized patients with COVID-19 without hypoxemia requiring supplemental oxygen, the IDSA guideline panel suggests against the use of glucocorticoids. (Conditional recommendation, Low certainty of evidence)
  23. ↑ Chrousos GP, Detera-Wadleigh SD, Karl M (December 1993). "Syndromes of glucocorticoid resistance" (PDF). Annals of Internal Medicine. 119 (11): 1113–24. doi:10.7326/0003-4819-119-11-199312010-00009. PMID 8239231. S2CID 26040431. Archived from the original (PDF) on 14 August 2017. Retrieved 4 July 2020.
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  30. ↑ Lajic S, Nordenström A, Hirvikoski T (2011). "Long-term outcome of prenatal dexamethasone treatment of 21-hydroxylase deficiency". Endocrine Development. 20: 96–105. doi:10.1159/000321228. ISBN 978-3-8055-9643-5. PMID 21164263. Archived from the original on 17 June 2020. Retrieved 17 June 2020.
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  33. ↑ Grape S, Usmanova I, Kirkham KR, Albrecht E (April 2018). "Intravenous dexamethasone for prophylaxis of postoperative nausea and vomiting after administration of long-acting neuraxial opioids: a systematic review and meta-analysis". Anaesthesia. 73 (4): 480–489. doi:10.1111/anae.14166. PMID 29226971.
  34. ↑ Kovac AL (May 2006). "Meta-analysis of the use of rescue antiemetics following PONV prophylactic failure with 5-HT3 antagonist/dexamethasone versus single-agent therapies". The Annals of Pharmacotherapy. 40 (5): 873–87. doi:10.1345/aph.1G338. PMID 16670361. S2CID 32843029. Archived from the original on 18 June 2020. Retrieved 17 June 2020.
  35. ↑ Polderman JA, Farhang-Razi V, Van Dieren S, Kranke P, DeVries JH, Hollmann MW, et al. (Cochrane Anaesthesia Group) (November 2018). "Adverse side effects of dexamethasone in surgical patients". Cochrane Database of Systematic Reviews. 11: CD011940. doi:10.1002/14651858.CD011940.pub3. PMC 6426282. PMID 30480776.
  36. ↑ Sadeghirad B, Siemieniuk RA, Brignardello-Petersen R, Papola D, Lytvyn L, Vandvik PO, et al. (September 2017). "Corticosteroids for treatment of sore throat: systematic review and meta-analysis of randomised trials". BMJ. 358: j3887. doi:10.1136/bmj.j3887. PMC 5605780. PMID 28931508.
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  39. ↑ 39.0 39.1 "High Elevation Travel & Altitude Illness | CDC Yellow Book 2024". wwwnc.cdc.gov. Archived from the original on 22 June 2023. Retrieved 10 July 2023.
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  46. ↑ "Dexamethasone 4.0 mg/ml injection – Summary of Product Characteristics (SPC)". electronic Medicines Compendium. Merck Sharp & Dohme Limited. 4 December 2013. Archived from the original on 8 May 2015. Retrieved 11 December 2013.
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