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{{drugbox || IUPAC_name = (3S-trans)-3-((1,3-Benzodioxol-5-yloxy)methyl)-
4-(4-fluorophenyl)-piperidine| image = Paroxetine-2D-skeletal.svg| image2= Paroxetine-3D-balls.png| CAS_number = 61869-08-7| ATC_prefix = N06| ATC_suffix = AB05| PubChem = 43815| DrugBank = APRD00364| C=19|H=20|F=1|N=1|O=3| molecular_weight = 374.8| bioavailability = complete absorption from GI, but extensive first-pass-metabolization in the liver; max concentration 4.9 (with meals) to 6.4 hours (fasting)| metabolism = extensive, probable hepatic| elimination_half-life = 24 hours (range 3-65 hours)| excretion = 66% urine, 37% bile| licence_EU = | licence_US = Paroxetine | pregnancy_AU =| pregnancy_US = D| pregnancy_category =| legal_status = Rx-only| routes_of_administration = Oral-->Paroxetine (Paxil, Seroxat) is a selective serotonin reuptake inhibitor (SSRI) antidepressant. It was released in 1992 by the pharmaceutical company GlaxoSmithKline. In 2006 it was the fifth-most prescribed antidepressant in the United States retail market, with more than 19.7 million prescriptions.The paroxetine prescriptions were calculated as a total of prescriptions for Paxil CR and generic paroxetine using data from the charts for generic and brand-name drugs. The prescription of this drug is controversial because of side effects such as suicidal ideation and paroxetine#Withdrawal_syndrome which have resulted in legal proceedings against the manufacturer.

Indications Approved Paroxetine is primarily used to treat the symptoms of Clinical depression, obsessive-compulsive disorder (obsessive-compulsive disorder), post-traumatic stress disorder (post-traumatic stress disorder), panic disorder, generalized anxiety disorder (generalized anxiety disorder), social anxiety disorder, and premenstrual dysphoric disorder (premenstrual dysphoric disorder).

It was the first antidepressant formally approved in the United States for the treatment of social anxiety disorder .

According to the prescribing information provided by the manufacturer of Paxil brand of paroxetine GlaxoSmithKline and approved by the FDA, the effectiveness of paroxetine in major depressive disorder has been proven by six placebo-controlled clinical trials. For panic disorder, three 10-12-week studies indicated paroxetine superiority to placebo. Similarly, three 12-week trials for adult outpatients with social anxiety disorder demonstrated better response to paroxetine than to placebo.

Unapproved/off-label/investigational Double-blind studies indicated that paroxetine can also be used in the treatment of premature ejaculation. After receiving paroxetine for several weeks, intravaginal ejaculation latency time (IELT) of the study subjects increased 6-13-fold, which was longer than the delay achieved by the treatment with other SSRIs (fluvoxamine, fluoxetine, sertraline and citalopram). However, paroxetine taken acutely ("on demand") 3–10 hours before coitus resulted only in a "clinically irrelevant and sexually unsatisfactory" 1.5-fold delay of ejaculation and was inferior to clomipramine, which induced a four-fold delay.

There is also evidence that paroxetine may be effective in the treatment of compulsive gambling and hot flashes.

In two double-blind studies of bipolar disorder patients, addition of paroxetine to a mood stabilizer had no advantages over addition of placebo. Benefits of paroxetine prescription for diabetic neuropathy or chronic tension headache. are uncertain.

Pharmacology Paroxetine is the most potent and one of the most specific selective serotonin (5-hydroxytryptamine, 5-HT) reuptake inhibitors (SSRI). This activity of the drug on brain neurons is thought to be responsible for its antidepressant effects.

Paroxetine is a phenylpiperidine derivative which is chemically unrelated to the tricyclic antidepressant or tetracyclic antidepressant antidepressants. In receptor binding studies, paroxetine did not exhibit significant affinity for the adrenergic (α1, α2, β), dopaminergic, serotonergic (5HT1, 5HT2), or histamine receptors of rat brain membrane. A weak affinity for the Muscarinic acetylcholine receptor and noradrenaline receptors was evident. The predominant metabolites of paroxetine are essentially inactive as 5-HT reuptake inhibitors.

Chemistry Paroxetine hydrochloride is an odorless, off-white powder, having a melting point range of 120° to 138°C and a solubility of 5.4 mg/mL in water.

Formulations Remood (paroxetine) is available in 20 mg tablets.

Paxil / Seroxat (paroxetine) is available in 10, 20, 30, and 40 mg tablets.

Paxil CR (paroxetine extended release) is available in 12.5, 25, and 37.5 mg tablets.

Paroxetine CR (controlled release) was shown to be associated with a lower rate of nausea during the first week of treatment than paroxetine immediate release. However, the rate of treatment discontinuation due to nausea was not significantly different.

Side effects General side effects are mostly present during the first 1-4 weeks while the body adapts to the drug. Almost all SSRIs are known to cause either one or more of these symptoms. A person receiving paroxetine treatment may experience a few, all, or none of the following side-effects, and most side-effects will disappear or lessen with continued treatment, though some may last throughout the duration. Side effects are also often dose-dependent, with fewer and/or less severe symptoms being reported at lower dosages, and more and/or more severe symptoms being reported at higher dosages. Increases or changes in dosage may also cause symptoms to reappear or worsen.

9 December 2004 European Medicines Agency (EMEA), i.e. the Committee for Medicinal Products for Human Use (CHMP), informed patients, prescribers and parents that paroxetine should not be prescribed to children. CHMP gave a warning to prescribers recommending close monitoring of adult patients at high risk of suicidal behaviour and/or suicidal thoughts. In other words, CHMP does not prohibit use of paroxetine with adults but stresses extreme caution in actual usage. Also withdrawal reactions upon stopping treatment is mentioned and therefore it is recommended to gradually reduce the dose over several weeks or months if decision of withdrawal is made.

Most common

Less common Check with your doctor if these continue or are bothersome.

Rare See your doctor if you have any of these symptoms.



Very rare but serious

Other

Paroxetine and other SSRIs have been shown to cause sexual side effects in most patients, both males and females. Although usually reversible, these sexual side effects can sometimes last for months, years or possibly indefinitely even after the drug has been completely withdrawn. This disorder is known as Post SSRI Sexual Dysfunction.

Withdrawal syndrome Many psychoactive medications can cause withdrawal symptoms upon discontinuation from administration. Evidence has shown that paroxetine has among the highest incidence rates and severity of SSRI discontinuation syndrome of any medication of its class., Common paroxetine withdrawal symptoms include repeated electrical shock sensations of the brain and body (see "brain zaps"), vertigo and hot flashes. Suicidal ideation is a frequently reported experience in those withdrawing from SSRIs. For those experiencing extreme and unusual difficulty discontinuing paroxetine, it is recommended that an SSRI with a longer half-life, such as fluoxetine, be administered for approximately two weeks, then discontinued, to lessen symptoms.

For 10 years, GlaxoSmithKline's marketing of the drug stated falsely that it was "not habit forming.", In 2002, the U.S. FDA published a new product warning about the drug, and the International Federation of Pharmaceutical Manufacturers Associations (IFPMA) declared GSK guilty of misleading the public about paroxetine on US television. The British Medical Journal quoted Charles Medawar, head of Social Audit: "This drug has been promoted for years as safe and easy to discontinue.... The fact that it can cause intolerable withdrawal symptoms of the kind that could lead to dependence is enormously important to patients, doctors, investors, and the company. GlaxoSmithKline has evaded the issue since it was granted a licence for paroxetine over 10 years ago, and the drug has become a blockbuster for them, generating about a tenth of their entire revenue. The company has been promoting paroxetine directly to consumers as 'non-habit forming' for far too long." As of 2007, GlaxoSmithKline's prescribing information acknowledges the symptoms but eschews the term "withdrawal" in favor of the phrases "serious discontinuation symptoms" and "discontinuation syndrome."

Patients considering paroxetine should be warned in advance of these risks, and withdrawal from any SSRI should be closely medically supervised by the prescribing provider.

Warning for pregnant women Pregnant women and those who might become pregnant should avoid taking the antidepressant Paxil because of a high risk of birth defects, according to a committee of obstetricians who published their opinion in the December 2006 issue of the journal Obstetrics & Gynecology.

The obstetric practice committee of the American College of Obstetricians and Gynecologists said pregnant women should not take Paxil because two previous studies found that the drug posed up to double the risk of heart defects in fetuses.

Nearly a year ago, the U.S. Food and Drug Administration (FDA) and GlaxoSmithKline -- which makes Paxil -- changed the warnings on the drug to include the results of the studies. The FDA then advised pregnant women to merely switch from Paxil to another SSRI drug, such as Prozac or Zoloft.

The FDA's enhanced warning on Paxil followed the results of a review of Sweden's birth registry that found pregnant women who took Paxil were 1.5 to 2 times more likely to give birth to a baby with heart defects than women who took other SSRIs or who did not take antidepressants at all.

Neonatal withdrawal symptoms from Paxil have also been documented from mothers taking Paxil during pregnancy.

Controversy In May 2007 a US court approved a settlement in a class action lawsuit brought on behalf of everyone in the United States who purchased Paxil or Paxil CR prescribed for a minor. The lawsuit alleged that GlaxoSmithKline promoted Paxil or Paxil CR for prescription to children and adolescents while withholding and concealing material information about the medication's safety and effectiveness for minors. GSK denied all claims. The settlement terms entitled everyone, who previously purchased Paxil or Paxil CR for the child or ward, to recover up to 100% of the documented out-of-pocket expenses or $100, if the documentation was not available.

In the UK since 2001 lawsuits have been filed representing people who have been prescribed Seroxat. They allege that the drug has serious side effects, which GlaxoSmithKline downplayed in patient information.

In March 2004 the FDA ordered a black box warning placed on SSRI and other antidepressants, warning of the risk for potential suicidal thinking in children and adolescents., ABC News reported that the prescribing of these medications to children subsequently dropped by 20 percent.. According to the Center for Disease Control and Prevention's Annual Summary of Vital Statistics, the suicide rate rose more than 18 percent in those 1 to 19 years old, from 2.2 per 100,000 in 2003 to 2.6 per 100,000 in 2004. In those 15 to 19 years old, the figures reflected a more than 12 percent rise in suicide, from 7.3 per 100,000 in 2003 to 8.2 per 100,000 in 2004. This led many experts to conclude that the warning, and subsequent reduction in the use of antidepressants, led to an increased suicide rate in this age group. The finding is consistent with an earlier finding, reported to the 2003 FDA Advisory Committee by Dr David Shaffer, that suicide rates in the United States fell during the 1990s, in line with the introduction of SSRIs.

Since the FDA approved paroxetine in 1992, approximately 5,000 U.S. citizens have sued GSK. Most of these people feel they were not sufficiently warned in advance of the drug's side effects - including particularly the withdrawal syndrome discussed above, after GSK had specifically advertised the drug as "not habit forming."

On January 29 2007, the BBC in the UK broadcast a fourth documentary in its 'Panorama' series about the drug Seroxat.{{cite web|url=http://news.bbc.co.uk/1/hi/programmes/panorama/6291773.stm|title=Secrets of the drug trials|date=2007-01-29|accessdate=2007-08-15|publisher=BBC--> This programme, entitled Secrets of the Drug Trials, focused on three GSK paediatric clinical trials on depressed children and adolescents. Data from the trials show that Seroxat could not be proven to work for teenagers. Also, one clinical trial indicated that adolescents were six times more likely to become suicidal after taking it.

Trade names Paroxetine is marketed under several tradenames:

Footnotes External links



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Paroxetine ( Paxil, Aropax ) : review
Paroxetine: a review by Bourin M, Chue P, Guillon Y. Neurobiology of Anxiety and Depression, Faculty of Medicine, BP 53508, F-44035 Nantes Cedex 1, France.

Paroxetine - Wikipedia, the free encyclopedia
Paroxetine (Seroxat, Paxil, Parotin, Aropax, Xetanor, ParoMerck, Rexetin) is a selective serotonin reuptake inhibitor (SSRI) antidepressant. It was released in 1992 by the ...

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Seroxat tablets and liquid contain the active ingredient paroxetine, which is a type of antidepressant known as a selective serotonin reuptake inhibitor (SSRI). This type of ...

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