Wikia

Psychology Wiki

Trazodone

Talk0
34,135pages on
this wiki

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)


Trazodone chemical structure
Trazodone

8-[3-[4-(3-chlorophenyl)piperazin-1-yl]propyl]
-6,8,9-triazabicyclo[4.3.0]nona-2,4,9-trien-7-one

IUPAC name
CAS number
19794-93-5
ATC code

N06AX05

PubChem
5533
DrugBank
APRD00533
Chemical formula {{{chemical_formula}}}
Molecular weight 371.864 g/mol
Bioavailability High
Metabolism Hepatic
Elimination half-life 3-6 hours
Excretion 20% feces,
80% urine
Pregnancy category USA: C
Legal status Unscheduled;
Rx only
Routes of administration Oral

Trazodone (Desyrel®, Trittico®, Thombran®, Trialodine®) is a psychoactive compound with sedative, anxiolytic, and antidepressant properties. The manufacturer claims that the antidepressant activity becomes evident in the first week of therapy. Trazodone has less prominent anticholinergic (dry mouth, constipation, tachycardia) and adrenolytic (hypotension, male sexual problems) side effects than most tricyclic antidepressants. The incidence of nausea and vomiting observed with Trazodone is relatively low compared to SSRIs.

Mechanism of actionEdit

Trazodone is a serotonin reuptake inhibitor and is also a 5-HT2 receptor antagonist. However, in contrast to the selective serotonin reuptake inhibitors such as fluoxetine (Prozac®), trazodone's antidepressant effects may be due to its antagonistic effect at the 5-HT2 receptor site (PMID 1365657).

PharmacokineticsEdit

Trazodone is well absorbed after oral administration with mean peak blood levels obtained at approximately 1 hour after ingestion. Absorption is somewhat delayed and enhanced by food. The mean blood elimination half-life is biphasic: the first phase's half-life is 3-6 hours, and the following phase's half-life is 5-9 hours. The drug is extensively metabolized with 3 or 4 major metabolites having been identified in man, some of which such as mCPP may contribute to the side effect profile of trazodone. Approximately 70-75% of C14-labelled trazodone was found to be excreted in the urine within 72 hours (PMID 1037253). Trazodone is highly protein-bound.

UsesEdit

ContraindicationsEdit

PrecautionsEdit

Trazodone is metabolised by CYP3A4, a liver enzyme (PMID 9616194). Inhibition of this enzyme by various other substances may delay its degradation, leading to high blood levels of trazodone. CYP3A4 may be inhibited by many other medications, herbs, and foods, and as such, trazodone may interact with these substances. One drug-food interaction is grapefruit juice. Drinking grapefruit juice is discouraged in patients taking trazodone. One glass of grapefruit juice once in a while is not likely to have this effect on most people, but drinking large amounts, or drinking it regularly is proven to.

The possibility of suicide in depressed patients remains during treatment and until significant remission occurs. Therefore, the number of tablets prescribed at any one time should take into account this possibility, and patients with suicide ideation should never have access to large quantities of trazodone.

Episodes of complex partial seizures have been reported in a small number of patients. The majority of these patients were already receiving anticonvulsant therapy for a previously diagnosed seizure disorder.

While trazodone is not a true member of the SSRI class of antidepressants, it does still share many properties of the SSRIs, especially the possibility of discontinuation syndrome if the medication is stopped too quickly. Care must therefore be taken when coming off the medication, usually by a gradual process of tapering down the dose over a period of time.

Pregnancy and LactationEdit

  • Pregnancy : Sufficient data in humans is lacking. The use should be justified by the severity of the condition to be treated.
  • Lactation : Sufficient data in humans is also lacking. Additionally, trazodone may be found in the maternal milk in significant concentrations. The use in breastfeeding women should be carefully weighed against possible risks.

Side effectsEdit

The most common adverse reactions encountered are drowsiness, nausea/vomiting, headache and dry mouth. Adverse reactions reported include the following:

BehavioralEdit

Drowsiness, fatigue, lethargy, psychomotor retardation, lightheadedness, dizziness, difficulty in concentration, confusion

NeurologicEdit

Tremor, headache, ataxia, akathisia, muscle stiffness, slurred speech, slowed speech, vertigo, tinnitus, tingling of extremities, paresthesia, weakness, complex partial seizures, and, rarely impaired speech, muscle twitching, numbness, dystonia and involuntary movements.

AutonomicEdit

Dry mouth, blurred vision, priapism, diplopia, miosis, nasal congestion, constipation, sweating, urinary retention, increased urinary frequency and incontinence.

CardiovascularEdit

Orthostatic hypotension, hypertension, tachycardia, palpitations, shortness of breath, apnea, syncope, arrhythmias, prolonged P-R interval, atrial fibrillation, bradycardia, ventricular ectopic activity (including ventricular tachycardia), myocardial infarction and cardiac arrest.

Rare Side EffectsEdit

Recent clinical studies in patients with pre-existing cardiac disease indicate that trazodone may be arrhythmogenic in some patients in that population. Arrhythmias identified include isolated PVC's, ventricular couplets, and in 2 patients short episodes (3 to 4 beats) of ventricular tachycardia. There have also been several post-marketing reports of arrhythmias in trazodone-treated patients who have pre-existing cardiac disease and in some patients who did not have pre-existing cardiac disease. Until the results of prospective studies are available, patients with pre-existing cardiac disease should be closely monitored, particularly for cardiac arrhythmias. Trazodone is not recommended for use during the initial recovery phase of myocardial infarction.

GastrointestinalEdit

Nausea, vomiting, diarrhea, gastrointestinal discomfort, anorexia, increased appetite.

LiverEdit

Rare cases of idiosyncratic hepatotoxicity have been observed, possibly due to the formation of reactive metabolites (PMID 15978881).

EndocrineEdit

Decrease and, more rarely, increase in libido, weight gain and loss, and rarely, menstrual irregularities, retrograde ejaculation and inhibition of ejaculation.

Elevated prolactin concentrations have been observed in patients taking trazodone (PMID 7673654).

Trazodone has been associated with the occurrence of priapism. In approximately 33% of the cases reported, surgical intervention was required and, in a portion of these cases, permanent impairment of erectile function or impotence resulted. Male patients with prolonged or inappropriate erections should immediately discontinue the drug and consult their physician. If the condition persists for more than 24 hours, it would be advisable for the treating physician to consult a urologist or appropriate specialist in order to decide on a management approach.

Allergic or toxicEdit

Skin rash, itching, edema, and, rarely, hemolytic anemia, methemoglobinemia, liver enzyme alterations, obstructive jaundice, leukocytoclastic vasculitis, purpuric maculopapular eruptions, photosensitivity and fever.

MiscellaneousEdit

Aching joints and muscles, peculiar taste, hypersalivation, chest pain, hematuria, red, tired and itchy eyes.

Occupational HazardsEdit

Since trazodone may impair the mental and/or physical abilities required for performance of potentially hazardous tasks, such as operating an automobile or machinery, the patient should be cautioned not to engage in such activities while impaired.

Laboratory testsEdit

It is recommended that white blood cell and differential counts should be performed in patients who develop sore throat, fever, or other signs of infection or blood dyscrasia and trazodone should be discontinued if the white blood cell or absolute neutrophil count falls below normal.

Drug InteractionsEdit

Trazodone may enhance the effects of alcohol, barbiturates and other CNS depressants; patients should be cautioned accordingly.

Increased serum digoxin and phenytoin levels have been reported to occur in patients receiving trazodone concurrently with either of those 2 drugs. Little is known about the interaction between trazodone and general anesthetics; therefore, prior to elective surgery, trazodone should be discontinued for as long as clinically feasible.

Because it is not known whether an interaction will occur between trazodone and MAO inhibitors, administration of trazodone should be initiated very cautiously with gradual increase in dosage as required, if an MAO inhibitor is given concomitantly or has been discontinued shortly before medication with trazodone is instituted.

Trazodone may cause hypotension including orthostatic hypotension and syncope; caution is required if it is given to patients receiving antihypertensive drugs and an adjustment in the dose of the antihypertensive medication may be required.

Because of the absence of experience, concurrent administration of electroconvulsive therapy should be avoided.

DosageEdit

Treatment should be started with low initial doses of 25 to 50 mg daily in divided doses or in an evening single dose. The dose may be increased slowly to a maximum of 300 mg daily in ambulatory patients and to 600 mg daily in hospitalized patients. Geriatric and emaciated patients should begin with 100 mg daily; this dose may be slowly increased to 300 mg. The duration of treatment should be at least one month. A 50 mg dose is recommended when using Trazodone as a sleep aid.

OverdoseEdit

SymptomsEdit

Overdosage of trazodone may cause an increase in incidence or severity of any of the reported adverse reactions, e.g. hypotension and excessive sedation. Death by deliberate or accidental overdosage has been reported (PMID 15975258, PMID 11603256).

TreatmentEdit

There is no specific antidote for trazodone. Management of overdosage should, therefore, be symptomatic and supportive. Any patient suspected of having taken an overdosage should be admitted to hospital as soon as possible and the stomach emptied by gastric lavage. Forced diuresis may be useful in facilitating elimination of the drug.

See alsoEdit

ReferencesEdit

External linksEdit


Antidepressants (ATC N06A) edit
Monoamine oxidase inhibitors (MAOI) Harmaline, Iproclozide, Iproniazid, Isocarboxazid, Nialamide, Phenelzine, Selegiline, Toloxatone, Tranylcypromine
Reversible inhibitor of monoamine oxidase A (RIMA) Brofaromine, Moclobemide
Dopamine reuptake inhibitor (DARI) Amineptine, Phenmetrazine, Vanoxerine, Modafinil
Norepinephrine-dopamine reuptake inhibitors Bupropion
Norepinephrine reuptake inhibitor (NRI) or (NARI) Atomoxetine, Maprotiline, Reboxetine, Viloxazine
Serotonin-norepinephrine reuptake inhibitor (SNRI) Duloxetine, Milnacipran, Venlafaxine
Selective serotonin reuptake inhibitor (SSRI) Alaproclate, Etoperidone, Citalopram, Escitalopram, Fluoxetine, Fluvoxamine, Paroxetine, Sertraline, Zimelidine
Selective serotonin reuptake enhancer (SSRE) Tianeptine
Tricyclic antidepressants (TCA) Amitriptyline, Amoxapine, Butriptyline, Clomipramine, Desipramine, Dibenzepin, Dothiepin, Doxepin, Imipramine, Iprindole, Lofepramine, Melitracen, Nortriptyline, Opipramol, Protriptyline, Trimipramine
Tetracyclic antidepressants Maprotiline, Mianserin, Nefazodone, Trazodone
Noradrenergic and specific serotonergic antidepressant (NaSSA) Mirtazapine
de:Trazodon
es:Trazodona
it:Trazodone
pl:Trazodon
ru:Тразодон
This page uses Creative Commons Licensed content from Wikipedia (view authors).

Around Wikia's network

Random Wiki