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Tricyclics Still Solid Performers Current p SYCHIATRY Tricyclics Still solid performers Tricyclics played an important therapeutic role in the past and are still valuable treatments for depression, anxiety, pain syndromes, and other disorders. It’s time to re-examine TCAs and prescribe them when appropriate. 30 Current VOL. 1, NO. 6 / JUNE 2002 p SYCHIATRY Current p SYCHIATRY for the savvy psychiatrist Rajendra Tummala, MD, MBA John M. Zajecka, MD ACNP Fellow, department of psychiatry Associate professor, department of psychiatry Rush Presbyterian St. Luke’s Medical Center, Chicago, Ill ecent practice guidelines generally do not stance abuse disorders, and eating disorders, to name a few. position tricyclic antidepressants (TCAs) Major depression To treat major depressive disorder, the as first-line therapies because of concerns American Psychiatric Association recommends selective sero- Rabout side effects and safety issues.1-3 Yet these agents have tonin reuptake inhibitors (SSRIs), bupropion, venlafaxine, important clinical uses—both for approved and off-label and the secondary amine TCAs desipramine and nortripty- indications—and diverse pharmacologic properties that line as “optimal” first-line therapy for most patients.1 The distinguish them from each other as well as from many of the Texas Medication Algorithm Project recommends SSRIs, “newer antidepressants.” bupropion, nefazodone, venlafaxine, or mirtazapine as first- Eleven TCAs are available in the United Table 1 States (Table 1). Here’s what the evidence says THERAPEUTIC DOSAGE RANGE about when and how to use them to treat a variety of psychiatric disorders, along with our Generic name Brand names Therapeutic dosage recommendations on how to reduce the risk range (mg/d) of side effects. Amitriptyline Elavil, Endep 150-300 Amoxapine Asendin 150-450 Indications and off-label uses Clomipramine Anafranil 100-250 TCAs’ pharmacologic properties make them Desipramine Norpramin, Pertofane 150-300 very versatile (Box 1).4 Major depression and Sinequan 150-300 Doxepin anxiety disorders (such as obsessive compul- Adapin sive disorder [OCD]) are the principal FDA- Tofranil, Tofranil PM 150-300 approved indications for TCAs. Other Imipramine Janimine, Sk-Pramine approved indications are anxiety (doxepin) Maprotiline Ludiomil 150-200 and childhood enuresis (imipramine). Pamelor 50-150 Common off-label uses supported by scientif- Nortriptyline ic literature include panic disorder, social Aventyl phobia, insomnia, posttraumatic stress disor- Protriptyline Vivactil 15-60 der (PTSD), generalized anxiety disorder Trimipramine Surmontil 150-300 (GAD), attention-deficit/hyperactivity disor- Trazodone Desyrel 50-600 der (ADHD), migraine headache, chronic * Dosage ranges are approximate. Dosage needs to be tailored by individual patient needs. The elderly, pain syndromes, premature ejaculation, sub- children, and the medically compromised may require lower dosages. VOL. 1, NO. 6 / JUNE 2002 31 Tricyclics Box 1 The anticholinergic side effects of TCAs have DUAL REUPTAKE INHIBITION OF TCAs been perceived to cause higher patient dropout and discontinuation rates, but studies have shown mixed he tricyclic antidepresants are a broad class of drugs that can results. In one meta-analysis comparing SSRIs and be divided, based on the number of rings in their nucleus, into T TCAs, the difference in dropout rates due to adverse tricyclics and tetracyclics. The tricyclics can be further classified into tertiary and secondary amines, based on the number of effects was less significant than previously reported. methyl groups on the side chain. In addition, some clinicians When total dropout rates for any reason were exam- include trazodone—an antidepressant chemically unrelated to tri- ined, the difference was less than was originally 10 cyclic, tetracyclic, or other known antidepressant agents—in the expected. broad class of TCAs. OCD In clinical practice, most patients with OCD are TCAs were initially hypothesized to block the reuptake of nor- started on an SSRI. Clomipramine is another valuable epinephrine (NE) or serotonin (5HT), thereby increasing the levels option, however, especially for patients who fail one or of these neurotransmitters at the postsynaptic receptor. More more therapeutic trials with SSRIs. Clomipramine recent theories include effects on pre- and postsynaptic receptors may produce significant therapeutic benefit in patients and other neurotransmitters, such as histamine and acetylcholine, with OCD, possibly because of its potent 5-HT reup- which explain the various side effects of TCAs. take properties. In one study, patients with OCD symp- The relative norepinephrine-reuptake-blocking effects versus toms who received clomipramine improved more than serotonin-reuptake-blocking effects of the TCAs and each drug’s those receiving SSRIs when each class was compared biochemical effects are summarized in Table 2. Except for with placebo.11 clomipramine, TCAs are relatively weak 5HT reuptake blockers. Panic disorder Although not approved for panic disor- der, imipramine and desipramine provide effective treat- ment, even in nondepressed patients.12 Doses and plas- line therapy and lists TCAs as second- or third-line therapy ma levels are the same as those used for treating depression. for patients with partial or no response to initial therapy.2 Start low (e.g., imipramine, 10 to 20 mg/d; desipramine, 10 Although recommended as first-line therapies, SSRIs to 25 mg/d) and increase gradually over several weeks to typ- and other newer antidepressants exhibit no greater efficacy ical therapeutic dosages (Table 1). Do not escalate too rapid- than TCAs in treating major depression.5,6 Three major ly, as this may increase anxiety or precipitate a panic attack. meta-analyses7-9 reported no significant difference in efficacy Uses in children TCAs have been used to treat children with between the two antidepressant classes. In the largest,9 pub- ADHD, OCD, enuresis, and depression. The American lished by the U.S. Department of Health and Human Academy of Child and Adolescent Psychiatry (AACAP) does not recommend TCAs as Imipramine and desipramine provide effective treatment first-line treatment for of panic disorder, even in nondepressed patients youths requiring pharma- cotherapy for depressive dis- Services, 50% of inpatients and 52% of outpatients respond- orders but acknowledges that some youths with depression ed to TCAs, whereas 54% of inpatients and 47% of outpa- may respond better to TCAs than to other medications.3 tients responded to SSRIs. Compared with SSRIs, TCAs also Imipramine is the only TCA indicated for nocturnal may be associated with higher rates of remission.7,8 enuresis, but its exact mechanism of action is not known. Clomipramine—approved for OCD—has been used for The benefit may be secondary to imipramine’s anticholiner- decades to treat depression and resistant depression. Two gic effect or to changes in sleep architecture. Recommended meta-analyses by the Danish University Antidepressant bedtime doses for children with enuresis are: Group7,8 showed that clomipramine produced a “significant- • 25 to 50 mg under age 12; ly better therapeutic effect” compared with citalopram and • up to 75 mg age 12 and older. paroxetine. In three major studies,5,7,8 TCAs showed greater TCAs are an option for children with ADHD, especial- effectiveness than SSRIs in treating melancholic depression. ly if ADHD is present with comorbid depression or anxiety 32 Current VOL. 1, NO. 6 / JUNE 2002 p SYCHIATRY Current p SYCHIATRY disorder. However, because at least four cases of Rajendra Tummala, MD clinical situations, their use is associated with sudden cardiac death have been reported in chil- potentially serious side effects, which may include dren taking desipramine, it is prudent to monitor anticholinergic effects, sedation, weight gain, cardiac function when children are started on CNS toxicity, orthostatic hypotension, cardiovas- TCAs. AACAP guidelines recommend obtaining cular toxicity, delirium, and risk of suicide by over- a baseline ECG, resting blood pressure, and pulse dose. The risk of side effects can be reduced with (supine or sitting, then standing), with regular careful prescribing practices (Box 2). monitoring of the child’s weight during TCA Anticholinergic effects, sedation TCAs vary in therapy. their anticholinergic activity (Table 2). Tertiary Combination therapy Few controlled studies have amine TCAs such as amitriptyline and protripty- tested TCAs as combination therapy. Trazodone John M. Zajecka, MD line may cause dry mouth, constipation, urinary can be used as an adjunct to SSRIs and hesitancy, and blurred vision in some patients, and monoamine oxidase inhibitors (MAOIs) for confusion in elderly or demented patients. patients with insomnia. TCAs are used as an Secondary amine TCAs such as nortriptyline or adjunct to treat resistant depression and OCD13,14 desipramine are less anticholinergic and less like- (e.g., clomipramine added to fluvoxamine to treat ly to cause these side effects. OCD).15 Serum level monitoring is recommended Peripheral anticholinergic side effects can be when TCAs are used as adjuncts. managed with bethanacol—a cholinergic drug— Other uses TCAs play a role in the prophylactic in dosages of 25 to 50 mg tid or qid. Dry mouth treatment of premature ejaculation and migraine headaches, can be treated with pilocarpine, 5 mg bid to qid, or oral probably because of their serotonergic (5HT2) effect. In bethanacol (5- to 10-mg tablets sublingually), artificial saliva patients
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