Title: PHYSIOLOGICAL MECHANISMS OF SEXUAL DYSFUNCTION SIDE EFFECTS ASSOCIATED WITH ANTIDEPRESSANT MEDICATION , By: Murray, John B., Journal of Psychology, 00223980, Jul98, Vol. 132, Issue 4
ABSTRACT. Sexual dysfunction side effects have been associated with antidepressant medication, especially with serotonin reuptake inhibitors. Neurotransmitters appear to be involved, especially dopamine and serotonin, but the processes by which they influence sexual dysfunction are not clear.
THE EFFECTS OF PSYCHOTROPIC MEDICATIONS on human sexual functioning have been recognized for years. Such effects are now receiving even more attention because antidepressant medications, especially the selective serotonin reuptake inhibitor (SSRI) agents, have been accompanied by greater incidence of sexual side effects than has been expected, based on data from prerelease studies (Gitlin, 1994; Greenberg, 1971; Herman et al., 1990; Kline, 1989; Monteiro, Noshirvani, Marks, & Lelliott, 1987; Patterson, 1993; Singh, 1961; Zajecka, Fawcett, Schaff, Jeffriess, & Guy, 1991).
Many case reports and results of a few controlled studies have documented the associations among sexual dysfunction side effects and all classes of psychotropic medications–neuroleptics, benzodiazepines, and antidepressants (Akhtar & Thomson, 1980; Cohen & Rosenbaum, 1987; Decastro, 1985; Ghadirian, Annable, & Belanger, 1992; Ghadirian, Chouinard, & Annable, 1982; Jani, Wise, Kass, & Sessler, 1988; Lesko, Stotland, & Segraves, 1982; Lydiard, Howell, Laraia, & Ballenger, 1987; Sangal, 1985; Segraves, 1992; Wesson, Finnegan, & Clark, 1996). The physiological mechanisms involved in sexual dysfunction side effects are the topic of the present report. Systematic studies are lacking, and most of the reports are based on small samples of research participants.
Sexual dysfunction side effects are important clinically because they contribute to noncompliance with treatment regimens and may impair the user’s quality of life (Balon, Yeragani, Pohl, & Ramesh, 1993; Greenberg, 1971; Rothschild, 1995). For this reason, clinicians are advised to ask patients, particularly those taking SSRI medications, about sexual side effects; clinicians should not depend on patients’ spontaneous admissions. Patients are apt to put aside the medications that disturb them. Women may be less likely than men to spontaneously report sexual side effects. More research with female patients is needed, but reports that have stratified results by sex indicate that sexual side effects are comparable for men and women (Gitlin, 1994; Monteiro et al., 1987).
Estimates of the incidence of sexual dysfunction side effects associated with SSRIs range from 9% to 24% of users. Patients’ self-reports suggest that delayed or absent orgasm or ejaculation occurs in 11% to 20% of patients taking Prozac (fluoxetine), one of the most popular SSRI antidepressants (Segraves, 1994). Balon et al. (1993), using a questionnaire that focused on sexual side effects, found that 43% of their patients experienced sexual and other side effects associated with a variety of psychotropic medications. Patterson (1993) asked 60 male patients (average age 35 years) who were taking fluoxetine whether they experienced sexual side effects, and 45 (75%) reported retarded ejaculation or ejaculatory incompetence. Reducing the drug schedule to every other day reduced sexual dysfunction side effects for 50% of those patients.
Of 103 bipolar depression patients receiving lithium alone or in combination with other drugs, 75% of the women and 58% of the men indicated no change in sexual function, according to self-reports (Ghadirian et al., 1982). But lithium has been found to have fewer sexual dysfunction side effects than other antidepressant agents (Gitlin, 1994).
Can patients get relief from the sexual dysfunction side effects of antidepressants? Results of studies with a limited number of patients have indicated that sexual dysfunction side effects can be reduced (Gitlin, 1994, 1995). Strategies used to treat SSRI-induced sexual dysfunction include adding other medications, such as cyproheptadine (an antihistaminic/antiserotonergic agent; Decastro, 1985; Feder, 1991; Goldbloom & Kennedy, 1991; Katz & Rosenthal, 1994; McCormick, Olin, & Brotman, 1990; Segraves, 1987). Yohimbine, an adrenoceptor blocker, improved sexual function in a few patients who had received fluoxetine (Hollander & McCarley, 1992; Jacobsen, 1992; Pollack & Hammerness, 1993), as did amantadine, a mild dopamine agonist (Balogh, Hendricks, & Kang, 1992). Delaying medications until after coitus or taking yohimbine or cyproheptadine about 2 hr before engaging in sexual activity may restore ejaculatory function (Decastro, 1985; Segraves, 1994). Taking a reduced dosage and brief drug holidays have improved sexual functioning in a few patients (Rothschild, 1995). Switching to bupropion of the aminoketone class of antidepressants led to improvement in sexual function for some patients who had received fluoxetine (Jefferson, 1995; Walker et al., 1993). Double-blind studies are needed to establish the most effective treatments for reducing/preventing sexual side effects associated with SSRI antidepressants (Gitlin, 1994).
Sexual dysfunction can be divided into three categories: (a) loss of sexual interest or libido; (b) loss of physical arousal, including lubrication in women and erectile function in men; and (c) loss of orgasm, including ejaculation in men. Sexual dysfunction in all three areas has been associated with the three most commonly prescribed psychotropic medications (antidepressants, benzodiazepine, and neuroleptics; Gitlin, 1994). Because the erectile function is easier to observe, many studies have focused exclusively on men. When sexual dysfunction side effects of SSRI medications are cited, the three categories are not always included. Priapism, a pathologically prolonged and painful penile erection (a rare but serious effect of psychotropic medications), has been helped by injection of an alpha-adrenoreceptor stimulating drug, but the condition may require surgery (Kogeorgos & de Alwis, 1986; Patt, 1985; Raskin, 1985).
Patients with bipolar disorder who take lithium alone or in combination with other drugs identified decrease in sexual desire as the greatest difficulty (43% of the men and 40% of the women), followed by decreased quality of orgasm (24% of the women and 36% of the men; Ghadirian et al., 1992). Men reported delayed and absent ejaculation as problems associated with lithium in combination with other medications. The medications used in combination with lithium appear to be more of a factor in sexual dysfunction than is lithium used alone.
Mechanisms Possibly Involved in Sexual Side Effects
The incidence of sexual side effects associated with antidepressant medications, particularly the SSRI class, has been higher than expected from data in prerelease tests. Moreover, sexual side effects can arise from many sources.
Physiological mechanisms involved in psychotropic medications’ association with sexual function are not clearly understood (Ghadirian et al., 1992). SSRI antidepressants enhance serotonergic neurotransmission through selective inhibition of presynaptic neuron reuptake of serotonin (Benfield, Heel, & Lewis, 1986). The therapeutic efficacy of SSRIs is comparable to the older tricyclic and monoamine oxidase inhibitor (MAOI) antidepressants, and they have fewer side effects. Nonetheless, clinicians must carefully monitor patients’ reactions to the drugs because of the known sexual dysfunction side effects (Sussman, 1994).
All the antidepressants share a common adaptive regulation of noradrenergic, serotonergic, and glutamate neurotransmission, suggesting possibly unifying mechanisms of action underlying their antidepressant effects (Kilts, 1994). A new antidepressant, nefazodone, has a twofold pharmacologic action on the serotonergic system and appears not to cause sexual side effects (Feiger, Kiev, Shrivastava, Wisselink, & Wilcox, 1996; Goodwin, 1996; Robinson et al., 1966; Taylor et al., 1995).
Sexual dysfunction could come from nonspecific central nervous system effects such as sedation, which can lead to a general decrease in sexual interest and function. Medications that block neurotransmitters such as serotonin and dopamine could cause sexual arousal and/or sexual dysfunction (Crews, Paul, & Goodwin, 1981; Goodwin, 1996; Segraves, 1989). Some medications have multiple effects that lead to complex clinical effects; SSRI and tricyclic antidepressants may interact antagonistically (DeVane, 1994; Goldbloom & Kennedy, 1991; Goodnick, 1989; Hyman & Nestler, 1996; Kapur & Remington, 1996; Katz & Rosenthal, 1994; Popli, Baldessarini, & Cole, 1994; Preskorn, 1996; Robinson et al., 1996; Service, 1996). Because sexual dysfunction can come from many sources, clinicians are urged to examine patients thoroughly before attributing the dysfunction to antidepressants (Gitlin, 1994).
The biology of normal sexual response and activity is not completely understood (Gartrell, 1986; Gitlin, 1994; Segraves, 1989). Consistent data on age-related reduction of sexual desire in the general population are lacking; baselines of sexual function in patient populations before treatment are rarely described, and the effects of Axis I disorders on sexual functioning are not often reported (Feiger et al., 1996; Goodnick, Henry, & Buki, 1995; Weizman et al., 1983). Decreased sexual interest during depressive illness has been considered so common that it once was a diagnostic criterion of depression.
With depressed patients, factors separate from the impact of psychotropic medications on sexual dysfunction, such as the effects of substance abuse, alcohol, and opiates, should be investigated (Cushman, 1972; Schiavi, Stimmel, Mandeli, & White, 1995). Studies have demonstrated differences in neuroendocrine responses of depressed and healthy control groups (Goodnick et al., 1995; Pearlstein & Stone, 1994; Price, Charney, Delgado, & Heninger, 1991; Schwartz, Bauman, & Masters, 1982).
The action of neurotransmitters has been used to explain human behavior, both normal and abnormal. Neurotransmitters have been associated with effects on peripheral behavior as well as central functions. Peripheral a-adrenergic blockade may cause prolonged erection, and medications with a-blocking properties promote erections (Gitlin, 1994). Ejaculation seems to be peripherally mediated by a-adrenergic blocking properties (Jacobsen, 1992; Mendels, 1995; Wise, 1994). The relative effects of excitatory and inhibitory neurotransmitters may result in enhancement or inhibition of sexual functioning (Segraves, 1989). Trazodone, a SSRI class medication, has increased libido in a few patients; in a few others, it led to orgasmic inhibition (Gartrell, 1986; Jani et al., 1988; Sullivan, 1988).
Single neurotransmitters may be altered by medications, but several neurotransmitters, such as norepinephrine and serotonin, are viewed as altered by the same antidepressant (Goodnick et al., 1995; Taylor et al., 1995). Neurotransmitters may interact as serotonin and dopamine seem to do, but serotonergic modulation of dopaminergic function is not yet well understood (Hyman & Nestler, 1996; Kapur & Remington, 1996). SSRI drugs may potentiate inhibitory effects of serotonin on metabolic production or on release of dopamine by neurons of the basal ganglia (Baldessarini & Marsh, 1990). Serotonin may have an inhibitory action on dopamine neurons of the midbrain and brain stem. Fluoxetine has been shown to inhibit synthesis of catecholamines in several dopamine-rich areas of the forebrain. Results with amantadine, a mild dopamine agonist, suggest that anorgasmia may be traced to the effects of serotonin on dopamine activity (Balon et al., 1993; Stark & Hardison, 1985).
Sexual side effects with neuroleptic drugs probably can be traced to the dopamine-blocking properties of those drugs (Segraves, 1989). Dopamine agonists may improve libido (Gitlin, 1994). The neurotransmitter acetylcholine probably does not play a direct role in sexual function, but it may have a mediating, indirect effect. Anticholinergic side effects are not prominent with SSRI antidepressants (Balon et al., 1993; Stark & Hardison, 1985).
Because SSRI antidepressants have been associated with many sexual dysfunction side effects, sexual dysfunction appears to be related to serotonin; however, how serotonin influences sexual function is not yet clearly understood (Dubovsky & Thomas, 1995; Gitlin, 1994; Price et al., 1991; Robinson et al., 1996; Spoont, 1992; Sussman, 1994; Walker et al., 1993). Serotonin was isolated from whole blood less than 50 years ago and recognized as a vasoconstrictor. For almost 10 years, drugs that selectively act on reuptake on serotonergic nerve terminals have been effective antidepressants (Goodwin, 1996). The SSRIs are more effective than placebos in major depression and equal in efficacy to older antidepressants. Clinically consistent evidence has shown, however, that SSRIs and the drug clomipramine are associated with high rates of decreased libido, erectile dysfunction, ejaculatory disturbance, and delayed orgasm and anorgasmia. Research with animals has offered no clear picture of the connection between serotonin and sexual dysfunction side effects (Adler-Graschinsky, Butta, & Elgoyhen, 1986; Gitlin, 1994; Segraves, 1989; Zitrin, Beach, Barchas, & Dement, 1970).
Virtually all antidepressants have been reported to occasionally decrease libido, cause delay of orgasm and anorgasmia, and cause erectile dysfunction (Gitlin, 1994). Fluoxetine dominates the market, so sexual dysfunction side effects associated with it have been reported frequently. Other SSRIs, such as sertraline and paroxetine, also appear to be associated with those sexual dysfunction side effects (DeVane, 1994; Feiger et al., 1996; Stark & Hardison, 1985; Wernicke, 1985). Fluoxetine may exert indirect pharmacodynamic action on nonserotonin systems of the brain and may be involved in potentially clinically important pharmacokinetic interactions with other agents (Baldessarini & Marsh, 1990). Antidepressants such as nefazodone, which affects more than one serotonin nerve terminal and has not been associated with sexual dysfunction, would benefit depressive patients and spare them the burden of sexual side effects; consequently, they might not be tempted to discontinue use of their antidepressant medications.
Sexual dysfunction side effects associated with antidepressants, especially the SSRI agents, have embarrassed patients and disturbed them enough that some have discontinued taking their medications. Antidepressant medications have benefited many depressed patients since their introduction 40 years ago; most patients receiving them apparently do not experience sexual dysfunction side effects. However, the incidence of sexual dysfunction side effects associated with antidepressants may have been underestimated; the incidence of reported problems has been greater when patients have been questioned about side effects than when researchers have relied on spontaneous reports of difficulties. Women are less likely to report sexual dysfunction spontaneously; however, because sexual dysfunction may be traced to disturbed endocrines (for example, in diabetes mellitus), more information about women is needed. Studies on sexual dysfunction side effects mostly have been based on small numbers and have lacked controls, although recent investigations have been multicentered.
All antidepressants have approximately equal clinical efficacy and modulate a number of different nerve receptors after chronic administration. All have a delay in onset of action. Such commonalities suggest a receptor theory of antidepressants, but whether the abnormality in receptor function is a necessary and sufficient cause of abnormal affect states is not known.
SSRIs have proved to be important therapeutic agents for depression, and they have been effective in treatment of obsessive compulsive disorders and panic disorder. A new antidepressantmay be the drug of the future because it is therapeutically as effective as the older tricyclics (MAOIs and SSRIs) but has not been associated with sexual dysfunction side effects.
Animal studies have not clarified the action of serotonin in sexual function. Some evidence indicates that dopamine and serotonin are involved together in several sexual dysfunctions. Alpha-adrenoreceptors probably also play a role.
Sexual dysfunction varies and has been associated with benzodiazepine and neuroleptics, but it has been more frequently associated with antidepressants. Sexual dysfunction also has been associated with substance abuse and some medical conditions involving endocrines. Thorough examination of depressive patients’ backgrounds is urged in order to eliminate other sources of sexual dysfunction before changing their psychotropic regimen. Pharmacology has extended the number of serotonin receptor subtypes, and the challenge remains to develop antidepressants that target specific receptors that will help depressed patients without burdening them with sexual dysfunction.
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Received November 7, 1996
Address correspondence to John B. Murray, St. John’s University, Psychology Department, 8000 Utopia Parkway, Jamaica, NY 11439.
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By JOHN B. MURRAY, Psychology Department St. John’s University
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