The function of sildenafil on female sexual pathways: a double-blind, cross-over, placebo-controlled study

The risk is greater in people aged older than 50, with diabetes, heart

disease, high blood pressure, high cholesterol, who

• Some studies investigate sildenafil’s impact on vaginal blood flow.
• Psychological factors also significantly influence female sexual response.
• Not all women will experience improved sexual function with sildenafil.
• Sexual therapy remains an important treatment option.

smoke, or with certain pre-existing eye problems.

What should I do in case of overdose?

Phosphodiesterase type 5 inhibitor enhancement of nitric oxide–cyclic guanosine monophosphate signaling occurs in both women and men. Studying Drug Treatment of Adverse Drug EffectWomen in the Nurnberg study had to have reported good sexual interest and activity before the onset of depression and antidepressant treatment. Their episodes of sexual dysfunction had to be associated with antidepressant treatment and needed to have remitted with improvement of depression and discontinuation of medication. Baseline endocrine values were obtained in these women to later analyze for possible correlations with treatment response. This analysis indicated that women whose sexual function sildenafil chewable tablets improved after receiving sildenafil or placebo had higher mean levels of free testosterone and thyroxine.

Safety Considerations

Ninety-eight women of 145 screened were randomized to receive either sildenafil in a 50-mg starting dosage or matching placebo. They were instructed to take the study medication approximately 1 to 2 hours before anticipated sexual activity but not more than once daily. They were asked to attempt to have sexual activity twice weekly, but not less than once weekly throughout the 8-week trial. Treatment efficacy was measured with 4 validated instruments. The primary outcome measure was the mean improvement on the Clinical Global Impression Scale (CGI) adapted for sexual function. Rarely, may cause other side effects or lead

to painful erections lasting longer than four hours.

What side effects can this medicine cause?

A 50 mg dose of sildenafil was prescribed, and patients were instructed to take it approximately one hour before sexual activity. They were told to increase the dose to 100 mg on the next occasion if they experienced a partial response or a lack of response to sildenafil. The nine patients, all of whom had experienced either anorgasmia or delayed orgasm with or without associated disturbances, reported significant reversal of sexual dysfunction, usually with the first dose of 50 mg of sildenafil. Sildenafil is used to treat erectile dysfunction (ED) in men or pulmonary arterial hypertension (PAH) in both men and women, depending on the brand. Viagra and Vybrique are used for ED and Revatio is used for PAH.

Authors and Affiliations

Sildenafil works by blocking the action of an enzyme called cGMP-specific phosphodiesterase type-5 (PDE-5). This enzyme breaks down cGMP, a substance that induces smooth muscles to relax. Blocking PDE-5 means increased levels sildenafil pills of cGMP within the smooth muscles which promotes muscle relaxation and vasodilation (a widening of blood vessels). High levels of PDE-5 are found in the penis, lungs, and retina. PDE-5 is also found throughout the body within the smooth muscle cells of the blood vessels and muscles. See your doctor immediately if this happens. May not be suitable for some people including those with

Ethics declarations

Sildenafil belongs to the drug class called phosphodiesterase (PDE) type 5 inhibitors. Sildenafil (Viagra, Vybrique brands and generic) is used to treat erectile dysfunction (ED, impotence). It increases blood flow to the penis following sexual stimulation by blocking the enzyme responsible for the breakdown of cGMP. This allows men to keep an erection hard enough for sex. Sildenafil (Viagra, Vybrique brands and generic) only works following sexual stimulation. angina, chest pain, other heart conditions, liver or kidney problems,

Frequently asked questions

It works within 30 to 60 minutes, but may be taken up to four hours before sexual activity. Sildenafil (Revatio brand) reduces high blood pressure associated with pulmonary arterial hypertension (PAH). This improves the ability to exercise in people with PAH and delays any worsening of their symptoms. When used to treat PAH, sildenafil is available as tablets (20 mg) for and an IV injection. When used for ED, sildenafil is available as oral tablets of 25 mg, 50 mg, and 100 mg strengths, or an oral film (Vybrique brand) of 25 mg, 50 mg, 75 mg, and 100 mg strengths. blood or bleeding disorders, stomach ulcers, certain eye conditions, or

Does Viagra help women?

The study, recently published in JAMA, was conducted by George Nurnberg, MD, of the department of psychiatry, University of New Mexico, and colleagues.1 This group's 2003 study, also published in JAMA, demonstrated sildenafil's benefit in men with this complaint.2 That study was a departure from the anecdotal or open-label reports that served as an evidence base for a myriad of proposed remedies.3 Although the association between sexual dysfunction and antidepressant therapy has been recognized since the introduction of tricyclics, the incidence of this adverse effect has increased since the advent of serotonin reuptake inhibitors (SRIs). Sexual dysfunction has also played a role in reducing patient adherence to the prescribed medication. Consequently, Nurnberg commented to Psychiatric Times, "treatments have been driven more by opinion than by solid data." Nurnberg and colleagues emphasize this concern in their latest study, warning that "without evidence-based data to treat sexual function associated with SRIs in women, clinicians may lack the confidence to manage it effectively, which leaves patients exposed to excess random pharmacology." The investigators employed a design and protocol similar to those in their study with men. The data for women indicated that sildenafil reduced adverse sexual effects, specifically including delayed orgasm responses and inadequate lubrication. Nurnberg commented on the relative sparsity of research on the effect of sildenafil on orgasm function, despite the fact that delayed or unachieved orgasm is "the central factor of SRI antidepressant-associated sexual dysfunction." He attributed this to the FDA-approved indication and marketing focus for male erectile dysfunction and to the more complex measures needed to assess orgasm function in women than sexual arousal in men.

Obstet. Gynecol.

In addition, he noted, the initial studies of sildenafil had not shown benefit in women with sexual arousal disorder unrelated to antidepressant medication. Nevertheless, there was good reason to evaluate the effects of a selective phosphodiesterase type 5 inhibitor such as sildenafil in women experiencing sexual dysfunction from antidepressant medication, according to Nurnberg. The initial studies of sildenafil for women with sexual arousal disorder may not have adequately controlled for hormonal factors or level of sexual interest, or measured efficacy in the varied facets of sexual response. Later, more focused studies yielded favorable results. In addition, Nurnberg noted, nitric oxide synthase isoforms, nitric oxide, and phos- phodiesterase type 5 inhibitors are present in female genital tissue. a physical deformity of the penis (such as Peyronie's disease).

• Psychological support can enhance the effectiveness of medical treatments.
• Female sexual health is complex and multifaceted.
• Sildenafil should not replace comprehensive sexual health assessments.
• Evidence supports combining medication with behavioral therapies.

Higher dosages of sildenafil are associated with a higher risk of death in children with PAH.

What other information should I know?

Secondary outcome instruments were the Sexual Function Questionnaire, the Arizona Sexual Experience scale–female version, and the University of New Mexico Sexual Function Inventory–female version. Patients maintained logs that were reviewed for the frequency and percentage of successful intercourse attempts and the number of satisfactory attempts at orgasm. In the intention-to-treat analysis, women receiving sildenafil had a statistically significant higher mean score improvement from baseline of 1.9 on the CGI than the 1.1 mean improved score for those receiving placebo. In the secondary outcome measures, sildenafil was associated with greater improvement on scores in the domain of orgasm function, including the ability to reach orgasm and to experience orgasm satisfaction. The investigators proclaimed this study important "not only because women experience major depressive disorder at nearly double the rate of men and because they experience greater resulting sexual dysfunction than men, but also because it establishes that selective phosphodiesterase type 5 inhibitors are effective in both sexes for this purpose." In later discussion, Nurnberg added, "the issue is keeping patients compliant with a medication by actively treating a side effect." Although acknowledging that clinical options include switching adversely affected patients from an SRI to an antidepressant having less incidence of sexual dysfunction, Nurnberg cautioned against discontinuing an effective agent with side effects and substituting another agent, which may or may not be as effective.

How much time does it take for Viagra to work for females?

Instead, he recommended that clinicians "encourage the patient not to stop the medication but to call to discuss which option would be useful-including waiting for it to go away." SildenÂafil treatment of women with antidepressant-asso-ciated sexual dysfunction: a randomized controlled trial. Treatment of antidepressant-associated sexual dysfunction with sildenafil: a randomized controlled trial. Rudkin L, Taylor MJ, Hawton K. Strategies for managing sexual dysfunction induced by antidepressant medication. In an open study, sildenafil (Viagra) was prescribed for nine women outpatients who reported sexual dysfunction induced by antidepressant medication, primarily selective serotonin reuptake inhibitors. For this reason, the FDA does not recommend use in children aged less than 18 years.

Patients and Methods

If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include: Dyspepsia, flushing, headache, indigestion, muscle or back pain, and visual disturbances are the most common side effects reported. Other side effects include a drop in blood pressure, insomnia, nasal congestion, or a runny nose and nosebleeds. Sudden hearing loss has also been reported. Some people taking sildenafil have had bleeding events; however, it has not been established if this is related to sildenafil use. Rarely, may decrease blood flow to the optic nerve causing sudden vision loss.