Exploring Pharmaceutical Treatments for PE

On-Demand Intervention (on a “Prn” Basis) Encouraging as the success of the chronic administration of SSRIs has been in the treatment of PE, side effects, such as dry mouth, headaches, and dizziness, have presented a problem [54].

Men are understandably reluctant to accept continuous, long-term headaches, dry mouth, and dizziness on a daily basis, as the price for improving IELT on significantly less frequent occasions [12,33,55,56].

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Both SSRIs and clomipramine may delay ejaculation at the expense of a diminution of libido and a moderate decrease in penile rigidity (which is reversible). Patients should be informed of these possible side effects prior to initiating therapy [1]. The abrupt reduction or discontinuation of long-term SSRI therapy can result in the “SSRI discontinuation syndrome”—a cluster of somatic and psychological symptoms including nausea and vomiting, vertigo, headache, unstable gait, lethargy, agitation, anxiety, and insomnia. These symptoms begin from 1 to 3 days after discontinuance, and may last over 1 week. The side effects can usually be reversed by the reintroduction of the SSRI [53]. In an attempt to minimize these side effects and better target the patient’s needs in a cost-effective manner, on-demand use of SSRI has been advocated [54].

There is only modest laboratory-based support for the on-demand use of SSRI.

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Based on the level of evidence ratings of the studies reviewed, treatment of PE with topical anesthetics received a grade A recommendation from an expert panel at the Second International Consultation on Sexual Medicine [1]. The search for an effective, oral agent to remedy PE has been hampered by the complexity, variability, and subjectivity of this condition as noted earlier. Nevertheless, trials of centrally acting agents date back to as early as 1943 [34]. Some of the earlier medical approaches to the problem involved the use of alpha amino benzoate as well as various alpha blockers. Phenoxybenzamine, as well as more selective alpha blockers, such as terazosin and alfuzosin, were among the first agents utilized.

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The adverse event profile of these medications, however, led to their gradual phaseout as other therapies emerged. In 1973, the use of clomipramine and other tricyclic antidepressants was advocated, signaling the beginning of a new era in the approach to treating PE that will be discussed in the following segments of this review [39]. On-Going, Long-Term Medications on a Daily Basis Selective Serotonin Reuptake Inhibitors (SSRIs) Treatment with an SSRI activates the 5-HT2C receptor, adjusts the ejaculatory threshold set point, and delays ejaculation [1]. The extent of this delay varies widely depending upon the type, dose, and frequency of SSRI administration and the genetically determined ejaculatory threshold set point. The ability of SSRIs to delay ejaculation was first uncovered serendipitously during the use of these medications in the treatment of depressed men in the 1970s [40].

Paroxetine (Paxil®) for PE

Fluoxetine was next shown to be helpful in the intentional treatment of PE [41]. Subsequently, a placebo-controlled trial of paroxetine proved promising [42]. A double-blind, fixed-dose trial of randomly assigned 20- or 40-mg daily doses of paroxetine in 27 patients with primary PE showed a statistically significant improvement in ejaculation time with both doses, as compared to placebo. Because the increase in the IELT was relatively similar in both groups, the authors concluded that daily 20-mg paroxetine “may be considered as an adequate treatment for primary premature ejaculation,” but that a higher dose may further increase the ejaculatory latency [42]. Kim and Seo compared the efficacy and safety of 4 weeks each of fluoxetine, sertraline, clomipramine, and placebo in treating PE in 36 men. While the acute administration of SSRI leads to an abrupt lowering of 5-HT release into the synapse, it only effects a mild increase in the postsynaptic neurotransmission and stimulation of 5-HT receptors there [57–59]. Nevertheless, laboratory assessments have documented a marked increase in 5-HT in both the cerebrospinal and the extravascular fluid following a single dose of SSRI [60–62].

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Escitalopram has been shown to be efficacious in the treatment of PE. It should be mentioned that as compared with other SSRIs, citalopram has not shown the greatest efficacy, and the ejaculatory-delaying effects are definitely inferior to paroxetine [51]. A meta-analysis of the bayer vardenafil effects of various SSRIs found that citalopram and fluvoxamine were the least efficacious among the SSRIs [1,21]. In 2007, Safarinejad [52] published the results of his study comparing the results following 3 months of therapy with escitalopram vs. placebo.

Psychological causes

Because the SSRI activity of citalopram resides mainly in the S-enantiomer, the investigator postulated that this high selectivity of the S-enantiomer (i.e., escitalopram) may translate into higher efficacy. The study was designed to assess increases in mean geometric IELT immediately after the study (3 months), as well as at 6 months. There was an insignificant increase in the mean IELT in the placebo group, whereas the SSRI group had a 4.9-fold increase of the mean IELT. More importantly, the author showed that with a 6-month follow-up (i.e., after the medication had been withdrawn), the escitalopram group continued to demonstrate increased mean IELT (3.1-fold vs. 1.3-fold for placebo) [52].

Sildenafil (Viagra)

Although escitalopram has the highest rate of bothersome side effects, such as nausea, headache, and dry mouth, the overall incidence of adverse events with all SSRIs is typically less than 5% [52]. The author cautioned that additional studies are needed before this medicine can be recommended as ideal therapy for PE. SSRIs may give rise to side effects such as fatigue, mild nausea, loose stools, or heavy perspiration. These complaints may gradually dissipate buy vardenafil 40mg within 2–3 weeks. The side effects of clomipramine (a tricyclic antidepressant) are similar, although more pronounced, and consist of nausea, dry mouth, and fatigue. Examination of the time course of central and peripheral neurochemical effects of sertraline (SER) in nonhuman primates showed that

Analgesic, Opioid

As compared with an IELT increase from a baseline of 46 seconds to 2.27 minutes with placebo, therapy with the other agents resulted in increased IELT to 2.30, 4.27, and 5.75 minutes with the other agents, respectively. The SSRIs sertraline and fluoxetine were shown to be more effective than placebo in this 1998 controlled study [43]. Importantly, treatment with the SSRI sertraline was nearly as effective in delaying ejaculation as clomipramine, but had a significantly lower incidence of side effects. SSRIs may cause an increase in latency time as early as 2–3 days after the initiation of oral therapy. This effect tends to plateau after 3–4 weeks, with a six- to eightfold increase in IELT [44,45].

Vardenafil (Levitra®) for PE

In order of clinical response, a meta-analysis of 35 studies of daily SSRI treatment found that paroxetine was the most effective, followed by fluoxetine, then sertraline, and lastly fluvoxamine [19]. The same group also set out to assess tadalista professional whether the ejaculatory-delaying effects of at least some SSRIs may be applicable in men with “less-rapid” ejaculation. Following treatment with paroxetine 20 mg/day, the percentage increase in the geometric mean IELT compared with baseline in patients treated with paroxetine was 420% in patients with classic PE (less than or equal to 1 minute) and 480% in those with less rapid PE (greater than 1 minute), indicating that the paroxetine-induced percentage increase in IELT appeared to be independent of the baseline IELT, and that the findings may be extrapolated to men with less-rapid ejaculation. Other studies have documented efficacy for different SSRIs. For example, sertraline was found to be effective in improving IELT, ejaculatory control, and sexual satisfaction [46–48].

Pelvic floor exercises

Similarly, a recent report on the efficacy of duloxetine in treating PE showed that treatment with this SSRI increased the IELT from 38.21 16.45 seconds to 129.34 seconds 67.58 (P = 0.001 vs. control) [49]. Fluvoxamine is an SSRI unrelated in its chemical structure to other SSRIs or to clomipramine. Of all the SSRIs, it seems to have the least effect on prolonging IELT. This information may be helpful in advising psychiatrists, as they select an antidepressant for sexually asymptomatic men for whom further prolongation of IELT would be undesired [19,50]. the 5-HT level achieved after one oral dose of sertraline was comparable to that measured throughout a 28-day course [63].

• Dapoxetine's side effects can include nausea, headache, and dizziness.
• Topical anesthetics include lidocaine and prilocaine-based creams or sprays.
• SSRIs like fluoxetine, sertraline, may also be used off-label for PE.
• Opioid medications require careful medical oversight due to dependency potential.
• Behavioral approaches are first-line treatment for many men with PE.
• Regular exercise can improve overall sexual function and control.
• Some innovations include vibration devices to delay ejaculation temporarily.
• Medical tests may be recommended to exclude underlying causes.
• Education about sexual response stages can improve control strategies.
• Sex therapy often involves both partners to address relational issues.
• Medications may take several weeks to show maximum benefit.
• Lifestyle modifications, like reducing alcohol, can also help manage PE.

investigated the degree of ejaculation delay induced by on-demand treatment with 20-mg paroxetine and 25-mg clomipramine in a

randomized, double-blind, fixed-dose, ondemand study in 30 men with lifelong PE with an IELT of less than 1 minute.

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Nonetheless, it is recommended that with the exception of fluoxetine, SSRIs should not be withdrawn acutely but gradually over 3–4 weeks [1]. It is also recommended that patients on SSRIs over an extended period of time undergo intermittent “wash-out periods” in order to avoid excessive levels of accumulation after multiple doses [53]. Overdose of SSRIs or (more commonly) drug– drug interactions between SSRIs and other agents that enhance the central nervous system 5-HT activity can lead to the “serotonin syndrome”—a cluster of severe, persistent symptoms including myoclonus, hyperreflexia, sweating, shivering, discoordination, and mental status changes [53]. Patients receiving long-term SSRI therapy for PE must be made aware of potential drug–drug interactions between SSRIs and other concurrent medications, and schedule their doses accordingly [53]. In men with lifelong PE,cessation of treatment results in reestablishment of the original set point within 5–7 days [1]. The authors found that whereas on-demand treatment with 25-mg clomipramine led to a clinically relevant ejaculation delay, this was not the case with 20-mg paroxetine.

• Dapoxetine is taken as needed, usually 1-3 hours before sex for rapid action.
• Topical anesthetics should be used sparingly to avoid numbness of partner.
• SSRIs may cause side effects like nausea, dizziness, or decreased libido.
• Tramadol carries potential for abuse and should only be used under medical supervision.
• Daily use of certain medications may be recommended for persistent PE.
• Psychological counseling helps address performance anxiety contributing to PE.
• Pelvic floor exercises improve control and delay ejaculation naturally.
• Partner involvement in therapy can improve treatment adherence.
• Discontinuing medication abruptly may cause withdrawal symptoms or rebound.
• For some men, combining therapy with lifestyle changes yields better results.
• Over-the-counter remedies should be approached cautiously and discussed with a doctor.
• Research continues into new pharmacological and non-pharmacological treatments.