Trazodone chemical structure
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Trazodone

Trazodone (Desyrel®, Trittico®, Thombran®) 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, obstipation, tachycardia) and adrenolytic (hypotension, male sexual problems) side effects than most TCAs. The incidence of nausea and vomiting observed with Trazodone is relatively low compared to SSRIs. more...

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Mechanism of action

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 the antagonism of 5-HT2 receptors (PMID 1365657).

Pharmacokinetics

Trazodone is well absorbed after oral administration with mean peak plasma levels obtained at approximately 1 hour after ingestion. Absorption is somewhat delayed and enhanced by food. The mean plasma 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. 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.

Uses

  • Depression with or without anxiety
  • Chronic Insomnia (in some countries, this is an off-label use)

Contraindications

  • Known hypersensitivity to trazodone
  • Use in patients below 18 years of age

Precautions

Trazodone is metabolised by CYP3A4, a liver enzyme (PMID 9616194). The activity of this enzyme may be affected 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.

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.

Pregnancy and Lactation

  • 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 Effects

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

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Tramadol addiction
From Journal of Family Practice, 4/1/05 by Stephen Patt

To the editor:

The only thing missing from the well-intentioned tramadol piece in JFP (McDiarmid T, Mackler L, Schneider DM, "Clinical inquiries. What is the addiction risk associated with tramadol?" J Fam Pract 2005; 54[1]:72-73) was a little common sense. The low numbers they quoted on tramadol addiction and detoxification seem paltry in comparison with illicit opiates (such as heroin) and diverted opiates (such as OxyContin), but the numbers can be deceptive--reporting agencies rarely know what's going on in the real world. In the treatment arena we see staggering amounts of Ultracet and tramadol addiction, with patients popping up to 30 or 40 pills daily to fill an ever-expanding mureceptor void. Many of these fall into the addiction innocently because, and I quote, "My doctor told me that these were safe!" Far from it. The tramadol mu activity is considerable in the opiate-naive patient, and even more so in the recovering opiate addict. The phenomenon of "reinstatement," where any activity at the receptor level triggers old drug-seeking behavior, is well documented, and should be avoided at all costs, especially given the broad nonopiate choices available to our patients in need, including the highly effective neural modulators (such as Neurontin, Depakote, and Trazodone) and NSAID/ COX-2 families. While any primary doc can step into the waters of addiction medicine, some formal training may help avoid potential disasters.

If a patient merits relief from pain that is not handled by current nonsteroidal and adjunctive modality therapy (lets not forget TENS units, massage therapy, and acupuncture), then certainly consider tramadol--but let's also consider the risks and warn the patient accordingly. Monitor their usage periodically, and don't give refills unless the patient is traveling out of the area. And finally, if your patient is one of the millions of opiate addicts seeking relief from bone-fide pain, do him and yourself a favor--don't use an opiate unless absolutely necessary, having exhausted all other measures. The risk of relapse is too great. Lest we forget, "Above all, do no harm."

Stephen Patt, MD, Family Practice, Santa Monica, Calif

Dr McDiarmid responds:

I regret that Dr Patt did not appreciate the emphasis I hoped to convey of the limitations on validity and generalizability of the manufacturer-sponsored surveillance program's estimated rates of tramadol abuse in a tramadol-exposed population. The limitations mentioned in the Clinical inquiry included nonrandom and nonrepresentative sampling methods, tramadol abuse likely suppressed by presence of more potent euphoriant in the studied addiction communities, and the low return rates of surveys from substance abuse experts. Each of these biases could significantly alter any attempts at estimating tramadol abuse rates in the general tramadolexposed populations.

I appreciate Dr Patt sharing his experience with patients who abuse large quantities of tramadol. There are case reports in the literature describing similar patient behaviors. I would encourage him to report such case experiences to the FDA's MedWatch program so that what is a personal clinical experience can contribute to the evidence of out collective knowledge.

FAST TRACK In the treatment arena we see staggering amounts of Ultracet and tramadol addiction

Todd McDiarmid, MD, Moses Cone Health System, Department of Family Medicine, University of North Carolina School of Medicine, Greensboro

COPYRIGHT 2005 Dowden Health Media, Inc.
COPYRIGHT 2005 Gale Group

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