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Propranolol









Propranolol


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Not to be confused with Propanol.

beta blocker drug






















































































































Propranolol
Propranolol.svg
Propranolol ball-and-stick model.png
Clinical data
Trade names Inderal, others

AHFS/Drugs.com
 Monograph
License data



  • EU EMA: by INN


  • US FDA: Propranolol
Pregnancy
category



  • AU: C


  • US: C (Risk not ruled out)



Routes of
administration
By mouth, rectal, intravenous
ATC code

  • C07AA05 (WHO)
Legal status
Legal status



  • AU: S4 (Prescription only)


  • CA: ℞-only


  • UK: POM (Prescription only)


  • US: ℞-only




Pharmacokinetic data
Bioavailability 26%
Metabolism
Liver (extensive) 1A2, 2D6; minor: 2C19, 3A4
Elimination half-life
 4–5 hours
Excretion
Kidney (<1%)
Identifiers
CAS Number

  • 525-66-6 ☑Y

PubChem CID
  • 4946
IUPHAR/BPS
  • 564
DrugBank

  • DB00571 ☑Y
ChemSpider

  • 4777 ☑Y
UNII
  • 9Y8NXQ24VQ
KEGG

  • D08443 ☑Y
ChEBI

  • CHEBI:8499 ☑Y
ChEMBL

  • ChEMBL27 ☑Y
ECHA InfoCard
100.007.618 Edit this at Wikidata
Chemical and physical data
Formula
C16H21NO2
Molar mass 259.34 g/mol
3D model (JSmol)
  • Interactive image
Chirality Racemic mixture

.mw-parser-output .nobold{font-weight:normal}
  (verify)

Propranolol, sold under the brand name Inderal among others, is a medication of the beta blocker class.[1] It is used to treat high blood pressure, a number of types of irregular heart rate, thyrotoxicosis, capillary hemangiomas, performance anxiety, and essential tremors.[1][2][3] It is used to prevent migraine headaches, and to prevent further heart problems in those with angina or previous heart attacks.[1] It can be taken by mouth or by injection into a vein.[1] The formulation that is taken by mouth comes in short-acting and long-acting versions.[1] Propranolol appears in the blood after 30 minutes and has a maximum effect between 60 and 90 minutes when taken by mouth.[1][4]


Common side effects include nausea, abdominal pain, and constipation.[1] It should not be used in those with an already slow heart rate and most of those with heart failure.[1] Quickly stopping the medication in those with coronary artery disease may worsen symptoms.[1] It may worsen the symptoms of asthma.[1] Caution is recommended in those with liver or kidney problems.[1] Propranolol may cause harmful effects in the baby if taken during pregnancy.[5] Its use during breastfeeding is probably safe, but the baby should be monitored for side effects.[6] It is a non-selective beta blocker which works by blocking β-adrenergic receptors.[1]


Propranolol was discovered in 1964.[7][8] It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.[9] Propranolol is available as a generic medication.[1] The wholesale cost in the developing world is between US$0.24 and US$2.16 per month as of 2014.[10] In the United States it costs about $15 per month at a typical dose.[1] In 2016 it was the 43rd most prescribed medication in the United States with more than 18 million prescriptions.[11]




Contents






  • 1 Medical uses


    • 1.1 Cardiovascular


    • 1.2 Psychiatric


      • 1.2.1 PTSD and phobias




    • 1.3 Others




  • 2 Contraindications


  • 3 Adverse effects


    • 3.1 Pregnancy and lactation




  • 4 Overdose


  • 5 Interactions


  • 6 Pharmacology


    • 6.1 Pharmacodynamics


    • 6.2 Pharmacokinetics




  • 7 History


  • 8 Society and culture


    • 8.1 Brand names




  • 9 Research


  • 10 References


  • 11 External links





Medical uses[edit]




An 80 mg capsule of extended-release propranolol




A mixture of 20 mg and 10 mg propranolol tablets




Propranolol


Propranolol is used for treating various conditions, including:



Cardiovascular[edit]



  • Hypertension


  • Angina pectoris (with the exception of variant angina)

  • Tachyarrhythmia

  • Myocardial infarction


  • Tachycardia (and other sympathetic nervous system symptoms, such as muscle tremor) associated with various conditions, including anxiety, panic, hyperthyroidism, and lithium therapy


  • Portal hypertension, to lower portal vein pressure

  • Prevention of esophageal variceal bleeding and ascites

  • Anxiety

  • Hypertrophic cardiomyopathy


While once a first-line treatment for hypertension, the role for beta blockers was downgraded in June 2006 in the United Kingdom to fourth-line, as they do not perform as well as other drugs, particularly in the elderly, and evidence is increasing that the most frequently used beta blockers at usual doses carry an unacceptable risk of provoking type 2 diabetes.[12]


Propranolol is not recommended for the treatment of hypertension by the Eighth Joint National Committee (JNC 8) because a higher rate of the primary composite outcome of cardiovascular death, myocardial infarction, or stroke compared to an angiotensin receptor blocker was noted in one study.[13]



Psychiatric[edit]


Propranolol is occasionally used to treat performance anxiety.[2] Evidence to support its use in other anxiety disorders is poor.[14] Some experimentation has been conducted in other psychiatric areas:[15]




  • Post-traumatic stress disorder (PTSD) and specific phobias (see subsection below)


  • Aggressive behavior of patients with brain injuries[16]

  • Treating the excessive drinking of fluids in psychogenic polydipsia[17][18]



PTSD and phobias[edit]


Propranolol is being investigated as a potential treatment for PTSD.[19][20] Propranolol works to inhibit the actions of norepinephrine, a neurotransmitter that enhances memory consolidation. In one small study individuals given propranolol immediately after trauma experienced fewer stress-related symptoms and lower rates of PTSD than respective control groups who did not receive the drug.[21] Due to the fact that memories and their emotional content are reconsolidated in the hours after they are recalled/re-experienced, propranolol can also diminish the emotional impact of already formed memories; for this reason, it is also being studied in the treatment of specific phobias, such as arachnophobia, dental fear, and social phobia.[22]


Ethical and legal questions have been raised surrounding the use of propranolol-based medications for use as a "memory damper", including: altering memory-recalled evidence during an investigation, modifying behavioral response to past (albeit traumatic) experiences, the regulation of these drugs, and others.[23] However, Hall and Carter have argued that many such objections are "based on wildly exaggerated and unrealistic scenarios that ignore the limited action of propranolol in affecting memory, underplay the debilitating impact that PTSD has on those who suffer from it, and fail to acknowledge the extent to which drugs like alcohol are already used for this purpose."[24]



Others[edit]




  • Essential tremor. Evidence for use for akathisia however is insufficient[25]


  • Migraine and cluster headache prevention[26][27] and in primary exertional headache[28]


  • Hyperhidrosis (excessive sweating)

  • Proliferating infantile hemangioma

  • Glaucoma


  • Thyrotoxicosis by deiodinase inhibition


Propranolol may be used to treat severe infantile hemangiomas (IHs). This treatment shows promise as being superior to corticosteroids when treating IHs. Extensive clinical case evidence and a small controlled trial support its efficacy.[29]



Contraindications[edit]


See also: Beta blocker § Contraindications

Propranolol may be contraindicated in people with:[30]



  • Reversible airways diseases, particularly asthma or chronic obstructive pulmonary disease (COPD)


  • Slow heart rate (bradycardia) (<60 beats/minute)

  • Sick sinus syndrome


  • Atrioventricular block (second- or third-degree)

  • Shock

  • Severe low blood pressure


  • Cocaine toxicity [per American Heart Association guidelines, 2005]



Adverse effects[edit]


See also: Beta blocker § Adverse effects

Propranolol should be used with caution in people with:[30]




  • Diabetes mellitus or hyperthyroidism, since signs and symptoms of hypoglycaemia may be masked


  • Peripheral vascular disease and Raynaud's syndrome, which may be exacerbated


  • Phaeochromocytoma, as hypertension may be aggravated without prior alpha blocker therapy


  • Myasthenia gravis, which may be worsened

  • Other drugs with bradycardic effects



Pregnancy and lactation[edit]


Propranolol, like other beta blockers, is classified as pregnancy category C in the United States and ADEC category C in Australia. β-blocking agents in general reduce perfusion of the placenta, which may lead to adverse outcomes for the neonate, including lung or heart complications, or premature birth. The newborn may experience additional adverse effects such as low blood sugar and a slower than normal heart rate.[31]


Most β-blocking agents appear in the milk of lactating women. However, propranolol is highly bound to proteins in the bloodstream and is distributed into breast milk at very low levels.[32] These low levels are not expected to pose any risk to the breastfeeding infant, and the American Academy of Pediatrics considers propranolol therapy "generally compatible with breastfeeding".[31][32][33][34]


Due to the high penetration across the blood–brain barrier, lipophilic beta blockers such as propranolol and metoprolol are more likely than other less lipophilic beta blockers to cause sleep disturbances such as insomnia and vivid dreams, and nightmares.[35] Dreaming (rapid eye movement sleep, REM) was reduced and increased awakening.[36][needs update]


Adverse drug reactions associated with propranolol therapy are similar to other lipophilic beta blockers.



Overdose[edit]


In overdose propranolol is associated with seizures.[37] Cardiac arrest may occur in propranolol overdose due to sudden ventricular arrhythmias, or cardiogenic shock which may ultimately culminate in bradycardic PEA.[38] Propranolol should be used with extreme caution in depressed or atypically depressed patients with possible suicidal ideation.[citation needed]



Interactions[edit]


Since beta blockers are known to relax the cardiac muscle and to constrict the smooth muscle, beta-adrenergic antagonists, including propranolol, have an additive effect with other drugs which decrease blood pressure, or which decrease cardiac contractility or conductivity. Clinically significant interactions particularly occur with:[30]



  • Verapamil


  • Epinephrine (adrenalin)


  • β2-adrenergic receptor agonists

    • Salbutamol, levosalbutamol, formoterol, salmeterol, clenbuterol etc.


  • Clonidine

  • Ergot alkaloids


  • Isoprenaline (isoproterenol)


  • Nonsteroidal anti-inflammatory drugs (NSAIDs)

  • Quinidine

  • Cimetidine

  • Lidocaine

  • Phenobarbital

  • Rifampicin


  • Fluvoxamine (slows down the metabolism of propranolol significantly, leading to increased blood levels of propranolol)[39]



Pharmacology[edit]



Pharmacodynamics[edit]































































































































Propranolol[40]
Site Ki (nM) Species Ref
5-HT1A
 55–272 Human
[41][42]
5-HT1B
 56–85 Rat
[43][44]
5-HT1D
 4,070 Pig [45]
5-HT2A
 4,280 Human [46]
5-HT2B
 457–513 (+)
166–316 (–)		 Human [47]
5-HT2C
 61,700 (+)
5,010 (–)
736–2,457		 Human
Human
Rodent
[47]
[47]
[48][42]
5-HT3
 >10,000 Human [49]
α1
 ND ND
ND
α2
 1,297–2,789 Rat [50]
β1
 0.02–2.69 Human
[51][52]
β2
 0.01–0.61 Human
[51][52]
β3
 450 Mouse [53]
D1
 >10,000 Human [42]
D2
 >10,000 Human [42]
H1
 >10,000 Human [54]
SERT 3,700 Rat [55]
NET 5,000 (IC50) Rat [56]
DAT 29,000 (IC50) Rat [56]
VDCC >10,000 Rat [57]
Values are Ki (nM), unless otherwise noted. The smaller the value, the more strongly the drug binds to the site.

Propranolol is classified as a non-cardioselective sympatholytic beta blocker that crosses the blood–brain barrier. It is lipid soluble and also has sodium channel blocking effects. Propranolol is a non-selective beta blocker; that is, it blocks the action of epinephrine (adrenaline) and norepinephrine (noradrenaline) at both β1- and β2-adrenergic receptors. It has little intrinsic sympathomimetic activity, but has strong membrane stabilizing activity (only at high blood concentrations, e.g. overdose).[58] Propranolol is able to cross the blood–brain barrier and exert effects in the central nervous system in addition to its peripheral activity.[22]


In addition to blockade of adrenergic receptors, propranolol has very weak inhibitory effects on the norepinephrine transporter and/or weakly stimulates norepinephrine release (i.e., the concentration of norepinephrine is increased in the synapse).[59][56] Since propranolol blocks β-adrenoceptors, the increase in synaptic norepinephrine only results in α-adrenoceptor activation, with the α1-adrenoceptor being particularly important for effects observed in animal models.[59][56] Therefore, it can be looked upon as a weak indirect α1-adrenoceptor agonist in addition to potent β-adrenoceptor antagonist.[59][56] In addition to its effects on the adrenergic system, there is evidence that indicates that propranolol may act as a weak antagonist of certain serotonin receptors, namely the 5-HT1A, 5-HT1B, and 5-HT2B receptors.[60][61][47] The latter may be involved in the effectiveness of propranolol in the treatment of migraine at high doses.[47]


Both enantiomers of propranolol have a local anesthetic (topical) effect, which is normally mediated by blockade of voltage-gated sodium channels. Studies have demonstrated propranolol's ability to block cardiac, neuronal, and skeletal voltage-gated sodium channels, accounting for its known membrane stabilizing effect and antiarrhythmic and other central nervous system effects.[62][63][64]



Pharmacokinetics[edit]


Propranolol is rapidly and completely absorbed, with peak plasma levels achieved about 1–3 hours after ingestion. Coadministration with food appears to enhance bioavailability.[65] Despite complete absorption, propranolol has a variable bioavailability due to extensive first-pass metabolism. Hepatic impairment therefore increases its bioavailability. The main metabolite 4-hydroxypropranolol, with a longer half-life (5.2–7.5 hours) than the parent compound (3–4 hours), is also pharmacologically active.


Propranolol is a highly lipophilic drug achieving high concentrations in the brain. The duration of action of a single oral dose is longer than the half-life and may be up to 12 hours, if the single dose is high enough (e.g., 80 mg). Effective plasma concentrations are between 10 and 100 mg/l.[citation needed] Toxic levels are associated with plasma concentrations above 2000 mg/l.[citation needed]



History[edit]


Main article: Discovery and development of β-adrenergic receptor antagonists (beta-blockers)

British scientist James W. Black developed propranolol in the 1960s.[66] In 1988, he was awarded the Nobel Prize in Medicine for this discovery. Propranolol was inspired by the early β-adrenergic antagonists dichloroisoprenaline and pronethalol. The key difference, which was carried through to essentially all subsequent beta blockers, was the inclusion of an oxymethylene group (-O-CH2-) between the aryl and ethanolamine moieties of pronethalol, greatly increasing the potency of the compound. This also apparently eliminated the carcinogenicity found with pronethalol in animal models.


Newer, more cardio-selective beta blockers (such as bisoprolol, nebivolol, carvedilol, or metoprolol) are now used in the treatment of hypertension.



Society and culture[edit]


In a 1987 study by the International Conference of Symphony and Opera Musicians, it was shown that 27% of interviewed members admitted to using beta blockers such as propranolol for musical performances.[67] For about 10–16% of performers, their degree of stage fright is considered pathological.[67][68] Propranolol is used by musicians, actors, and public speakers for its ability to treat anxiety symptoms activated by the sympathetic nervous system.[69] It has also been used as a performance-enhancing drug in sports where high accuracy is required, including archery, shooting, golf[70] and snooker.[70] In the 2008 Summer Olympics, 50-metre pistol silver medalist and 10-metre air pistol bronze medalist Kim Jong-su tested positive for propranolol and was stripped of his medals.[71]



Brand names[edit]


Original propranolol was marketed in 1965 under the brand name Inderal and manufactured by ICI Pharmaceuticals (now AstraZeneca). Propranolol is also marketed under brand names Avlocardyl, Deralin, Dociton, Inderalici, InnoPran XL, Sumial, Anaprilin, and Bedranol SR (Sandoz). In India it is marketed under brand names such as Ciplar and Ciplar LA by Cipla. Hemangeol, a 4.28 mg/mL solution of propranolol, is indicated for the treatment of proliferating infantile hemangioma.[72]



Research[edit]


Clinical research has been conducted to learn if propranolol could be useful in the treatment of some cancers.[73]



References[edit]





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External links[edit]




  • Stapleton MP (1997). "Sir James Black and propranolol. The role of the basic sciences in the history of cardiovascular pharmacology". Texas Heart Institute Journal. 24 (4): 336–42. PMC 325477. PMID 9456487.

  • U.S. National Library of Medicine: Drug Information Portal - Propranolol















Retrieved from "https://en.wikipedia.org/w/index.php?title=Propranolol&oldid=875414691"





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