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Longo, New London, Conn.; T. Malloy, Philadelphia; A. McCullough, New York; J. McMurray, Huntsville, Ala.; D.F. ; J Susset, Providence, R.I.; J. Tuttle, Lexington, Ky.; G. Wells, Birmingham, Ala.; C. White, Mobile, Ala.; J.

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The most frequently reported adverse effects of sildenafil in the two studies were transient headache, flushing, dyspepsia, and rhinitis (Table 3). Transient visual disturbances (i.e., changes in the perception of color hue or brightness) were reported by some men. The frequency of these adverse effects increased with increasing doses of sildenafil, but the symptoms were usually mild and lasted a few minutes to a few hours after dosing. No man reported priapism during the studies. Of the 225 men enrolled in the open-label extension study, 207 (92 percent) completed an additional 32 weeks of sildenafil treatment.

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Four men (2 percent) withdrew because of treatment-related adverse effects (headache in two, intermittent flushing and blurred vision in one, and groin pain and headache in one). We found that sildenafil improves sexual function in men with erectile dysfunction. In keeping with sildenafil's mode of action (i.e., the drug causes erection only in response to sexual stimulation), the studies were performed entirely in a natural environment, which meant that we had to rely on the men's own reports of efficacy. However, the self-administered International Index of Erectile Function has a high degree of sensitivity and specificity for detecting treatment-related changes in men with erectile dysfunction.13 This questionnaire, together with the global-efficacy question, provided a comprehensive assessment of erectile function during a specified recall period (four weeks), and the event log provided information about individual events during treatment. The men's partners were questioned in each of the studies, and although the results corroborated the men's efficacy assessments, only 25 percent of the partners completed the optional questionnaire. Young, Laguna Hills, Calif.; sildenafil citrate tablets 200mg and N.

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Zinner, Torrance, Calif. Impotence and its medical and psychosocial correlates: results of the Massachusetts Male Aging Study. Sex-ual behavior in the human male. Efficacy and safety of intracavernosal alprostadil in men with erectile dysfunction. Treatment of men with erectile dysfunction with transurethral alprostadil.

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Only one man with a visual disturbance discontinued treatment, and he also had flushing. Few men discontinued sildenafil, suggesting a relatively high level of drug tolerability and acceptance. No man had priapism after sildenafil treatment. Sildenafil has modest vasodilator properties but no effect on heart rate. The American Urological Association Panel on the Treatment of Organic Erectile Dysfunction stated that the ultimate goal is a therapy that is reliable, has minimal side effects, and is simple to use.6 Sildenafil appears to meet these specifications.

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Oral therapy permits discreet administration and is less invasive than some other treatment options, including injections into the corpus cavernosum, transurethral drug delivery, and prosthesis implantation. Goldstein, Lue, Padma-Nathan, Rosen, and Steers have served as consultants to Pfizer, manufacturer of sildenafil, as well sildenafil 50g as to other companies making products for the treatment of erectile dysfunction. We are indebted to all the investigators who participated in the trials; to Dr. Ian Osterloh and Dr. David Cox of Pfizer for their help with the study design and logistics; to Dr. Clinical Guidelines Panel on Erectile Dysfunction: summary report on the treatment of organic erectile dysfunction.

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In the dose-escalation study, 69 percent of all attempts at sexual intercourse by the men receiving sildenafil were successful in the last four weeks of treatment, as compared with 22 percent for those receiving placebo (P<0.001) (Figure 2B). During the last four weeks of treatment, the mean numbers of attempts at sexual intercourse that were successful were 5.9 for men in the sildenafil group and 1.5 for men in the placebo group (P<0.001) (Figure 2B). After 24 weeks of treatment in the dose–response study, improved erections were reported by 56, 77, and 84 percent of the men taking 25, 50, and 100 mg of sildenafil, respectively, as compared with 25 percent of those taking placebo (P<0.001 for treatment effect). After 12 weeks of treatment in the dose-escalation study, 101 of the 136 men in the sildenafil group who responded to the global-efficacy question (74 percent) reported improved erections, as compared with 23 of the 118 men in the placebo group who responded to the question (19 percent, P<0.001). During the dose–response study, 31 of the 316 men in the sildenafil group (10 percent) and 36 of the 216 men in the placebo group (17 percent) discontinued treatment (Table 3).

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Four men (1 percent) in the sildenafil group stopped taking the drug because of treatment-related adverse effects (nausea and vomiting in one, leg pain and backache in one, intermittent headache and dyspepsia in one, and headache in one), as compared with one man (<1 percent) who stopped taking placebo (because of headache and nausea). Five men (2 percent) in the sildenafil group and 11 men (5 percent) in the placebo group discontinued treatment because of insufficient responses. In the dose-escalation study, 9 men (6 percent) stopped taking sildenafil and 13 men (8 percent) stopped taking placebo. One man stopped taking sildenafil because of treatment-related headache and flushing, and one man stopped because of an insufficient response. Laboratory-test results indicated no evidence of sildenafil-induced abnormalities. Nitric oxide as a mediator of relaxation of the corpus cavernosum in response to nonadrenergic, noncholinergic neurotransmission. N Engl J Med 1992;326:90-94 Andersson, K-E, Wagner, G.

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Michael Collins and Dr. Michael Smith of Pfizer for their assistance with data analysis; and to Dr. Patricia Leinen and Dr. Michael Sweeney for aid in the preparation of the manuscript. The other members of the Sildenafil Study Group are S.

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Auerbach, Newport Beach, Calif.; A.L. Burnett, Baltimore; R. Castellanos, Fort Myers, Fla.; L. Charles, Stratford, N.J.; F. Eid, New York; R. Physiology of penile erection. The role of nitric oxide in the physiology of erection. Sildenafil: an orally active type 5 cyclic GMP-specific phosphodiesterase inhibitor for the treatment of penile erectile dysfunction. Sildenafil, a novel effective oral therapy for male erectile dysfunction. Br J Urol 1996;78:257-261 Rosen, RC, Riley, A, Wagner, G, Osterloh, IH, Kirkpatrick, J, Mishra, A. The International Index of Erectile Function (IIEF): a multidimensional scale for assessment of erectile dysfunction.

• Sildenafil was originally developed to treat pulmonary hypertension.
• The 100 mg dosage is often prescribed when lower doses are ineffective.
• It can cause vision changes such as blurred vision or a blue tint.
• Alcohol consumption can enhance side effects and reduce effectiveness.
• Patients with heart conditions should consult a doctor before use.
• The medication is available by prescription only in many countries.
• Use with caution in patients with kidney or liver impairment.
• Report any allergic reactions like rash or difficulty breathing immediately.
• Sildenafil may cause dizziness; avoid operating heavy machinery after intake.

Riley, AJ, Athanasiadis, L.

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Impotence and its non-surgical management. Br J Clin Pract 1997;51:99-103 Any commercial reuse of NEJM Group content requires permission. From the Department of Urology, Boston University Medical Center, Boston (I.G.

• The prescribing dose may vary based on individual health factors.
• Side effects are usually mild and temporary.
• Seek emergency medical care if you experience chest pain.
• Sildenafil can cause low blood pressure in some users.
• Ensure your healthcare provider is aware of all medications.
• Sexually transmitted diseases increase risks when using sildenafil.
• Response time varies; some may feel effects sooner or later.
• The medication was revolutionary for erectile dysfunction treatment.
• Regular lifestyle changes can enhance the efficacy of sildenafil.

); the Department of Urology, University of California, San Francisco (T.F.L. ); the Department of Urology, University of Southern California, Los Angeles, and the Male Clinic, Santa Monica, Calif. (H.P.-N.); the Department of Psychiatry, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway, N.J. ); the Department of Urology, University of Virginia, Charlottesville (W.D.S.

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Recognizing the fact that in most men erectile dysfunction is a multifactorial problem, we enrolled men with a broad variety of causes of erectile dysfunction. The identification of an organic abnormality does not establish it as the cause of erectile dysfunction.14 Conversely, failure to identify an organic cause does not prove a psychogenic origin. In the dose–response study, increasing doses of sildenafil (25 to 100 mg) were increasingly effective in improving the frequency of penetration and the maintenance of erections after penetration, the mean score for the erectile-function domain of the International Index, and the percentage of men reporting better erections. In the dose-escalation study, sildenafil treatment was associated with improvements in the frequency of penetration and the maintenance of erections after penetration. The therapeutic response to sildenafil was similar in men with various causes of erectile dysfunction.

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The mean scores after sildenafil therapy approached those of normal men of the same age. The men we studied had a normal level of sexual desire, as might be expected of men with erectile dysfunction who enter a clinical trial,13 and sildenafil did not alter that level. Successful sexual intercourse was therefore a key end point for these men. Overall, the results of the efficacy assessments demonstrated that sildenafil significantly improved erectile function and quadrupled the success of intercourse, with effectiveness maintained for at least six months. Its main adverse effects were headache, flushing, dyspepsia, and visual disturbances and were usually mild. Select the format you want to export the citation of this publication. Multi-view semi-supervised adversarial attention network for drug repurposing, Computer Methods and Programs in Biomedicine, 282, (109406), (2026). Multi‐Target Mechanisms of Moroccan Aphrodisiac Plants: An Integrative Computational and Phytochemical Investigation, Food Science & Nutrition, 14, 5, (2026). Artificial intelligence in drug research and development: a review of methods and applications in drug repurposing, Briefings in Bioinformatics, 27, 3, (2026).

• The medication is generally well tolerated when used correctly.
• Erectile response to sildenafil varies among individuals.
• Avoid heavy or greasy foods before taking the pill.
• Some side effects are more common in first-time users.
• Notify your doctor if your condition worsens or persists.
• Sildenafil 100 mg may also be prescribed for other health issues.
• Do not take sildenafil if you have recent history of stroke or heart attack.
• Confirm your allergies with your healthcare provider before use.
• Always store medication in a secure location away from children.

Endocrine-metabolic crosstalk in erectile dysfunction: mechanistic insights and therapeutic implications, International Journal of Impotence Research, (2026).

Overdose/Missed Dose

Feldman, Waterbury, Conn.; W. Fitch III, San Antonio, Tex. ; T. Garland, Lawrence, N.J.; M. Gittelman, North Miami, Fla.; D.

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Gleason, Tucson, Ariz.; F. Govier, Seattle; L. Hoffman, Gurnee, Ill.; J.M. Kaufman, Aurora, Colo.; I. Klimberg, Ocala, Fla.; V. Therapeutic applications of phosphodiesterase inhibitors in male reproductive health: narrative review, Sexual Medicine Reviews, 14, 2, (2026).