Dopamine

For other uses, see Dopamine (disambiguation).
Dopamine
Names
Trade namesIntropin, Dopastat, Revimine, others
Other names2-(3,4-Dihydroxyphenyl)ethylamine; 3,4-Dihydroxyphenethylamine; 3-hydroxytyramine; DA; Intropin; Revivan; Oxytyramine; Prolactin inhibiting factor; Prolactin inhibiting hormone
IUPAC name
  • 4-(2-Aminoethyl)benzene-1,2-diol
Clinical data
Main usesVery low blood pressure, slow heart rate that is causing symptoms[1]
WHO AWaReUnlinkedWikibase error: ⧼unlinkedwikibase-error-statements-entity-not-set⧽
Pregnancy
category
  • US: C (Risk not ruled out)
    Routes of
    use    		Intravenous injection
    Onset of actionWithin 5 min[1]
    Defined daily dose0.5 gram[2]
    External links
    AHFS/Drugs.comMonograph
    Physiological data
    Source tissuesSubstantia nigra; ventral tegmental area; many others
    Target tissuesSystem-wide
    ReceptorsD1, D2, D3, D4, D5, TAAR1[3]
    AgonistsDirect: apomorphine, bromocriptine
    Indirect: cocaine, amphetamine
    AntagonistsNeuroleptics, metoclopramide, domperidone
    MetabolismMAO, COMT,[3] ALDH, DBH, MAO-A, MAO-B, COMT
    Legal
    License data
    Legal status
    • In general: ℞ (Prescription only)
    Pharmacokinetics
    MetabolismMAO, COMT,[3] ALDH, DBH, MAO-A, MAO-B, COMT
    ExcretionKidney
    Chemical and physical data
    FormulaC8H11NO2
    Molar mass153.181 g·mol−1
    3D model (JSmol)
    Density1.26 g/cm3
    Melting point128 °C (262 °F)
    Boiling pointdecomposes
    SMILES
    • c1cc(c(cc1CCN)O)O
    InChI
    • InChI=1S/C8H11NO2/c9-4-3-6-1-2-7(10)8(11)5-6/h1-2,5,10-11H,3-4,9H2 checkY
    • Key:VYFYYTLLBUKUHU-UHFFFAOYSA-N checkY

    Dopamine, sold under the brandname Intropin among others, is a medication most commonly used in the treatment of very low blood pressure, a slow heart rate that is causing symptoms, and, if epinephrine is not available, cardiac arrest.[1] In newborn babies it continues to be the preferred treatment for very low blood pressure.[4] In children epinephrine or norepinephrine is generally preferred while in adults norepinephrine is generally preferred for very low blood pressure.[5][6] It is given intravenously or intraosseously as a continuous infusion.[1] Effects typically begin within five minutes.[1] Doses are then increased to effect.[1]

    Common side effects include worsening kidney function, an irregular heartbeat, chest pain, vomiting, headache, or anxiety.[1] If it enters into the soft tissue around the vein local tissue death may occur.[1] The medication phentolamine can be given to try to decrease this risk.[1] It is unclear if dopamine is safe to use during pregnancy or breastfeeding.[1] At low doses dopamine mainly triggers dopamine receptors and β1-adrenergic receptors while at high doses it works via α-adrenergic receptors.[1]

    Dopamine was first synthesized in a laboratory in 1910 by George Barger and James Ewens in England.[7] It is on the World Health Organization's List of Essential Medicines.[8] The wholesale cost in the developing world of a container of 400 mg is between $0.28 and $0.60 (USD) as of 2014.[9] In human physiology dopamine is a neurotransmitter as well as a hormone.[10]

    Medical uses

    Low blood pressure

    In newborn babies it continues to be the preferred treatment for very low blood pressure.[4] In children epinephrine or norepinephrine is generally preferred while in adults norepinephrine is generally preferred for very low blood pressure.[5][6]

    In those with low blood volume, this should be corrected with intravenous fluids before dopamine is considered.[1]

    Kidney function

    Low-dosage dopamine has been routinely used for the treatment and prevention of acute kidney injury. However, since 1999 a number of reviews have concluded that doses at such low levels are not effective and may sometimes be harmful.[11][12]

    Administration

    Since the half-life of dopamine in plasma is short—approximately one minute in adults, two minutes in newborn babies and up to five minutes in preterm babies—it is usually given as a continuous intravenous drip rather than a single injection.[13]

    Other

    A fluorinated form of L-DOPA known as fluorodopa is available for use in positron emission tomography to assess the function of the nigrostriatal pathway.[14]

    Dosage

    For low blood pressure or a slow heart rate, it is generally given at 5 to 20 mcg/kg/min.[1] When started at 5 mcg/kg/min, it may be increased every 10 minutes.[1] Occasionally doses up to 50 mcg/kg/min may be used.[1]

    The defined daily dose is 0.5 gram by injection.[2]

    Contraindications

    Dopamine should generally not be given to people who have a pheochromocytoma or uncorrected very fast heart rate.[1]

    Side effects

    The LD50, or dose which is expected to prove lethal in 50% of the population, has been found to be: 59 mg/kg (mouse; administered intravenously); 950 mg/kg (mouse; administered intraperitoneally); 163 mg/kg (rat; administered intraperitoneally); 79 mg/kg (dog; administered intravenously).[15]

    Extravasation

    If extravasation occurs local tissue death may result.[1] The medication phentolamine can be injected at the site to try to decrease the risk of tissue death.[1]

    Mechanism of action

    Its effects, depending on dosage, include an increase in sodium excretion by the kidneys, an increase in urine output, an increase in heart rate, and an increase in blood pressure.[13] At low doses it acts through the sympathetic nervous system to increase heart muscle contraction force and heart rate, thereby increasing cardiac output and blood pressure.[16] Higher doses also cause vasoconstriction that further increases blood pressure.[16][17]

    While some effects result from stimulation of dopamine receptors, the prominent cardiovascular effects result from dopamine acting at α1, β1, and β2 adrenergic receptors.[18][19]

    References

    1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 "Dopamine Hydrochloride". drugs.com. American Society of Health-System Pharmacists. June 29, 2016. Archived from the original on 14 September 2016. Retrieved 15 July 2016.
    2. 1 2 "WHOCC - ATC/DDD Index". www.whocc.no. Archived from the original on 29 October 2020. Retrieved 21 September 2020.
    3. 1 2 3 "Dopamine: Biological activity". IUPHAR/BPS guide to pharmacology. International Union of Basic and Clinical Pharmacology. Archived from the original on 5 February 2016. Retrieved 29 January 2016.
    4. 1 2 Bhayat, SI; Gowda, HM; Eisenhut, M (8 May 2016). "Should dopamine be the first line inotrope in the treatment of neonatal hypotension? Review of the evidence". World Journal of Clinical Pediatrics. 5 (2): 212–22. doi:10.5409/wjcp.v5.i2.212. PMC 4857235. PMID 27170932.
    5. 1 2 De Backer, D; Aldecoa, C; Njimi, H; Vincent, JL (March 2012). "Dopamine versus norepinephrine in the treatment of septic shock: a meta-analysis*". Critical Care Medicine. 40 (3): 725–30. doi:10.1097/ccm.0b013e31823778ee. PMID 22036860.
    6. 1 2 Dellinger, RP; Levy, MM; Rhodes, A; Annane, D; Gerlach, H; Opal, SM; Sevransky, JE; Sprung, CL; Douglas, IS; Jaeschke, R; Osborn, TM; Nunnally, ME; Townsend, SR; Reinhart, K; Kleinpell, RM; Angus, DC; Deutschman, CS; Machado, FR; Rubenfeld, GD; Webb, SA; Beale, RJ; Vincent, JL; Moreno, R; Surviving Sepsis Campaign Guidelines Committee including the Pediatric, Subgroup (February 2013). "Surviving sepsis campaign: international guidelines for management of severe sepsis and septic shock: 2012". Critical Care Medicine. 41 (2): 580–637. doi:10.1097/CCM.0b013e31827e83af. PMID 23353941.
    7. ↑ Fahn S (2008). "The history of dopamine and levodopa in the treatment of Parkinson's disease". Movement Disorders. 23 Suppl 3: S497–508. doi:10.1002/mds.22028. PMID 18781671. According to Hornykiewicz,6 dopamine was first synthesized by George Barger and James Ewens in 1910 at the Wellcome labs in London, England.
    8. ↑ 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.
    9. ↑ "Dopamine". International Drug Price Indicator Guide. Archived from the original on 22 January 2018. Retrieved 5 December 2015.
    10. ↑ Millar, Thomas (2002). Biochemistry explained : a practical guide to learning biochemistry. London: Routledge. p. 40. ISBN 9780415299411. Archived from the original on 2016-08-15.
    11. ↑ Karthik S, Lisbon A (2006). "Low-dose dopamine in the intensive care unit". Seminars in Dialysis. 19 (6): 465–71. doi:10.1111/j.1525-139X.2006.00208.x. PMID 17150046.
    12. ↑ Power, DA; Duggan, J; Brady, HR (April 1999). "Renal-dose (low-dose) dopamine for the treatment of sepsis-related and other forms of acute renal failure: ineffective and probably dangerous". Clinical and Experimental Pharmacology & Physiology. Supplement. 26: S23–8. PMID 10386250.
    13. 1 2 Bhatt-Mehta V, Nahata MC (1989). "Dopamine and dobutamine in pediatric therapy". Pharmacotherapy. 9 (5): 303–14. doi:10.1002/j.1875-9114.1989.tb04142.x. PMID 2682552.
    14. ↑ Deng WP, Wong KA, Kirk KL (2002). "Convenient syntheses of 2-, 5- and 6-fluoro- and 2,6-difluoro-L-DOPA". Tetrahedron: Asymmetry. 13 (11): 1135–1140. doi:10.1016/S0957-4166(02)00321-X.
    15. ↑ Lewis RJ (2004). Sax's Dangerous Properties of Industrial Materials, 11th Ed. Hoboken, NJ.: Wiley & Sons. p. 1552. ISBN 978-0-471-47662-7.
    16. 1 2 Bronwen JB, Knights KM (2009). Pharmacology for Health Professionals (2nd ed.). Elsevier Australia. p. 192. ISBN 978-0-7295-3929-6.
    17. ↑ De Backer D, Biston P, Devriendt J, Madl C, Chochrad D, Aldecoa C, Brasseur A, Defrance P, Gottignies P, Vincent JL (2010). "Comparison of dopamine and norepinephrine in the treatment of shock". The New England Journal of Medicine. 362 (9): 779–89. doi:10.1056/NEJMoa0907118. PMID 20200382.
    18. ↑ Moses, Scott. "Dopamine". Family Practice Notebook. Archived from the original on 1 February 2016. Retrieved 1 February 2016. Dopamine binds to alpha-1 and beta-1 adrenergic receptors. Mediated through myocardial beta-1 adrenergic receptors, dopamine increase heart rate and force, thereby increasing cardiac output. Alpha-1 adrenergic receptor stimulation on vascular smooth muscle, leads to vasoconstriction and results in an increase in systemic vascular resistance
    19. ↑ Katritsis, Demosthenes G.; Gersh, Bernard J.; Camm, A. John (19 September 2013). Clinical Cardiology: Current Practice Guidelines. OUP Oxford. p. 314. ISBN 9780191508516. Archived from the original on 6 May 2016. Dopamine binds to beta-1, beta-2, alpha-1 and dopaminergic receptors.
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