Table 15.2 Intermittent dosing (luteal phase only) of antidepressants Treatment Daily dose Duration N Conclusion References Open label Escitalopram 10–20 mg 3 cycles 27 � Freeman et al 2005 24 Nefazodone 100–150 mg 1 cycle 3 � Kodesh et al 2001 25 Paroxetine CR 25 mg (cross-over) 2 cycles 20 � Yonkers et al 2006 26 Venlafaxine 75–112.5 mg 2 cycles 11 � Cohen et al 2004 38 RCTs Clomipramine 25–75 mg 3 cycles 15 �� Sundblad et al 1993 23 Fluoxetine 90 mg (weekly) 3 cycles 167 �� Miner et al 200227 10 or 20 mg 3 cycles 141 �� Cohen et al 200228 Nefazodone 100–400 mg 4 cycles 22 � L<strong>and</strong>en et al 2001 29 Paroxetine 10 or 20 mg 4 cycles 48 � Steiner et al 2006 30 Paroxetine CR 12.5 or 25 mg 3 cycles 191 �� Steiner et al 2005 31 Sertraline 100 mg (cross-over) 2 cycles 8 � Halbreich <strong>and</strong> Smoller 199732 50 mg 2 cycles 11 � Young et al 199833 PSYCHOTROPIC THERAPIES 133 50–100 mg (cross-over) 2 cycles 57 � Jermain et al 199934 50–100 mg 3 cycles 115 �� Halbreich et al 200235 25–50 mg 2 cycles 151 �� Kornstein et al 2006 36 L-tryptophan 6 g 3 cycles 37 �� Steinberg et al 1999 37 N � the number of women who were on the active compound. Conclusion: ��, statistically significant improvement vs placebo; �, quality of evidence limited but positive outcome; �, no statistically significant improvement vs placebo.
134 THE PREMENSTRUAL SYNDROMES Weekly luteal phase dosing with enteric-coated fluoxetine 90 mg tablets has been reported to be efficacious in one RCT, 27 but to our knowledge this dosage regimen has not been widely disseminated into clinical practice. Semi-intermittent dosing is a more complicated regimen <strong>and</strong> involves continuous administration of the SSRI throughout the menstrual cycle, with increased doses during the luteal phase. Although intuitive, particularly for patients who experience premenstrual worsening of underlying mood <strong>and</strong>/or anxiety disorders, this intervention has not been widely assessed in controlled trials. To date, only one r<strong>and</strong>omized, placebo-controlled study has examined the efficacy of semi-intermittent treatment. 39 Several studies have also compared intermittent vs continuous dosing <strong>and</strong> found either no differences or advantage of the intermittent dosing 39–44 (Table 15.3). <strong>The</strong> extent to which different subgroups of women who suffer from severe <strong>PMS</strong>/<strong>PMDD</strong> could preferably benefit from either continuous or intermittent dosing remains to be investigated. So far, clinicians <strong>and</strong> patients have opted for intermittent vs continuous dosing primarily based on the patient’s symptom profile <strong>and</strong> treatment tolerability. Good c<strong>and</strong>idates for intermittent therapy are patients who wish to limit the amount of medication they take, are not able to adhere properly to the continuous regimen, have no mood symptoms during the follicular phase, or are concerned about long-term adverse effects (e.g. sexual dysfunction). 45 Treatment cost may also play a role in the option for intermittent treatment. Other alternatives for patients who are treated intermittently <strong>and</strong> do not achieve a robust clinical response include increasing the dose of the intermittently administered SSRI or switching to continuous SSRI treatment. If mood or anxiety symptoms emerge during the follicular phase of the menstrual cycle, strong consideration should be given to switching to continuous SSRI therapy. Finally, intolerable adverse effects that occur during intermittent SSRI therapy may be addressed in one of two ways: by watchful waiting to determine if they resolve over time or by a reduction in dose. For patients treated with continuous SSRIs <strong>and</strong> who only achieve suboptimal clinical response, the dose should be increased after the second menstrual cycle. Adverse effects are managed by watchful waiting; if this approach is not effective or if the adverse effect is intolerable, the dose should be reduced. When dosage reduction is not successful, consideration should be given to switching to intermittent SSRI administration. <strong>The</strong> specificity of the serotonergic antidepressants in the treatment of <strong>PMS</strong>/<strong>PMDD</strong> has been demonstrated in several comparative RCTs. Sertraline has been compared to desipramine, 20 fluoxetine to bupropion, 11 <strong>and</strong> paroxetine to maprotiline, 16 all clearly demonstrating the lack of efficacy of the non-SSRIs. Preliminary results have also shown that L-tryptophan, a serotonergic precursor, is an effective treatment for <strong>PMS</strong>, 37 whereas lithium is not. Treatment with nefazodone, a serotonin modulator, has been shown initially to have some beneficial effect 25 but in a subsequent RCT, nefazodone was not more effective than placebo. 29 <strong>The</strong> effectiveness of milnacipran, a presynaptic SNRI, has recently been demonstrated in three women with <strong>PMDD</strong> who were intolerant to SSRIs. 46 Overall, the response rate in most RCTs for clomipramine, the SSRIs <strong>and</strong> the SNRIs is �60% with a st<strong>and</strong>ardized mean difference in favor of the active drug (for reviews see also References 45, 47–49). To date, no evidence supports a differential treatment response to either SSRIs or SNRIs for patients with <strong>PMDD</strong>. Several of the larger RCTs have also clearly demonstrated that the improvement is not only in the behavioral/psychological symptoms of <strong>PMS</strong>/<strong>PMDD</strong> (in particular irritability) but also in the physical symptoms (breast tenderness <strong>and</strong> bloating) (e.g. References 16, 17, 19, 44, 49, <strong>and</strong> 50) as well as in the psychosocial domain. 44,51,52 Interestingly, premenstrual headaches do not appear to benefit from treatment with these agents. <strong>The</strong> side-effect profile <strong>and</strong> compliance reported in these studies do not differ significantly from those reported in studies using the same medications for other indications. Nonetheless, intermittent <strong>and</strong> low doses of clomipramine, SSRIs, <strong>and</strong> SNRIs, when used in the treatment of <strong>PMS</strong>/<strong>PMDD</strong>, seem to reduce the burden of side effects. <strong>The</strong> concern that intermittent dosing, especially of the antidepressants with a relatively short half-life, might cause withdrawal symptoms or the discontinuation syndrome has also been evaluated. <strong>The</strong> studies of intermittent dosing report neither a high frequency of initial side effects each time the medication is restarted nor any marked discontinuation symptoms. 53 <strong>The</strong> lack of significant withdrawal or discontinuation symptoms seen with intermittent dosing may be related to its unique mechanism of action (possibly GABA-a mediated), by which no prolonged exposure is needed to promote the therapeutic effect. In fact, subjects treated with intermittent dosing of SSRIs <strong>and</strong> SNRIs not only fail to experience discontinuation symptoms but also show improvement of symptoms that continues into the early follicular phase. 38,54 Adverse drug–drug interactions, especially with drugs competing for the same microsomal systems in the liver, are nevertheless potentially dangerous during intermittent dosing, as much as when used continuously. Given that <strong>PMS</strong>/<strong>PMDD</strong> affects women during their reproductive years, it is important to note that there is no
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The Premenstrual Syndromes
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© 2007 Informa UK Ltd First publis
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vi CONTENTS 10. Pathophysiology I:
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viii LIST OF CONTRIBUTORS Uriel Hal
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Preface Somatic, affective, and beh
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1 History of the premenstrual disor
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and estrogen/progesterone imbalance
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Dalton’s PMS, new, more precise t
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Many other therapeutic areas have b
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2 The diagnosis of PMS/PMDD - the c
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section of gynecological disorders,
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Universal acceptance of a diagnosti
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Extremely severe Severe None Severi
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Table 2.5 Differential diagnosis of
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17. Halbreich U, Borenstein J, Pear
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22 THE PREMENSTRUAL SYNDROMES pharm
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24 THE PREMENSTRUAL SYNDROMES IS PM
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26 THE PREMENSTRUAL SYNDROMES 18. S
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28 THE PREMENSTRUAL SYNDROMES METHO
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30 THE PREMENSTRUAL SYNDROMES Table
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32 THE PREMENSTRUAL SYNDROMES DAILY
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34 THE PREMENSTRUAL SYNDROMES Table
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36 THE PREMENSTRUAL SYNDROMES to ot
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38 THE PREMENSTRUAL SYNDROMES prosp
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40 THE PREMENSTRUAL SYNDROMES exami
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42 THE PREMENSTRUAL SYNDROMES healt
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46 THE PREMENSTRUAL SYNDROMES 35. B
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6 Comorbidity of premenstrual syndr
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inhibitor, medications routinely us
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symptoms as well as worsening of co
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7 The clinical presentation and cou
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ecause ovulation is less frequent a
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to try self-help strategies that ar
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40. WHO. International Classificati
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64 THE PREMENSTRUAL SYNDROMES ∆ 4
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66 THE PREMENSTRUAL SYNDROMES Anter
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68 THE PREMENSTRUAL SYNDROMES REFER
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70 THE PREMENSTRUAL SYNDROMES store
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72 THE PREMENSTRUAL SYNDROMES contr
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74 THE PREMENSTRUAL SYNDROMES Serot
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76 THE PREMENSTRUAL SYNDROMES These
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78 THE PREMENSTRUAL SYNDROMES level
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80 THE PREMENSTRUAL SYNDROMES 110.
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levonorgestrol, with estradiol 156