Oral Sildenafil Reduces Pulmonary Hypertension After Cardiac Surgery

Reference lists of all relevant studies identified were scanned.

• Sildenafil is sometimes used off-label for other medical conditions.
• Continuous use without medical supervision is not recommended.
• Follow your provider's instructions for frequency of use.

The Science Citation Index was searched using all relevant studies identified. Both Phase II and Phase III studies were included. The authors planned to compare sildenafil to other current treatments for erectile dysfunction, but no evidence was found. The review did not specify inclusion criteria for participants, but all included studies recruited men aged 18 years and over with erectile dysfunction of at least 6 months duration, in a heterosexual relationship for at least 6 months: aetiology included diabetes and spinal cord injury. Men with the following disorders were excluded: anatomical deformities; other sexual disorders; elevated prolactin (3xULN) or low free testosterone (20% below LLN); major uncontrolled psychiatric disorders; history of alcohol or drug abuse; history of major haematological, renal or hepatic disorder; stroke or MI within 6 months; cardiac failure, unstable angina, ECG ischaemia or life threatening arrhythmia within 6 months; BP outside the range 90/50 to 170/100 mmHg; active peptic ulcer disease of bleeding disorder; clinically significant baseline laboratory abnormality; need for anticoagulants, nitrates, androgen or trazodone; need for aspirin or NSAIDs and history of peptic ulcer disease; unwillingness to cease using other therapy for erectile dysfunction; other experimental drug use within 3 months; history of retinitis pigmentosa. The review did not specify which outcomes included studies should measure.

Phase II trials measured penile rigidity (using a Rigiscan) during visual or vibratory sexual stimulation. Phase III and some Phase II trials measured outcomes using the International Index of Erectile Function (IIEF): a self-administered questionnaire consisting of 15 questions around 5 domains of male sexual function: erectile function, orgasmic function, sexual desire, intercourse satisfaction, overall satisfaction. The authors do not state how many of the reviewers performed the selection. TTwo independent reviewers performed the validity assessment, but the method they used was not reported.

Database of Abstracts of Reviews of Effects (DARE): Quality-assessed Reviews [Internet].

Archived from the original on 11 November 2012. ^ "Viagra sildenafil price ireland patent tossed out by Supreme Court: Decision allows generic versions of drug to be produced". Archived from the original on 18 September 2013. ^ "Pfizer Canada drops Viagra price after generic versions get Supreme Court green light". Archived from the original on 30 November 2012.

Who should not take sildenafil?

Archived from the original on 27 December 2013. "In rare move, Pfizer asks Supreme Court to reconsider ruling that killed Viagra patent". Archived from the original on 5 February 2013. "The Supreme Court of Canada holds Pfizer's Viagra patent invalid". Archived from the original on 20 May 2013. The following aspects of validity were considered in the 'Results' section: blinding, control group, sample size, loss to follow-up. Two reviewers extracted data from all trials independently into pre-defined tables. Data were extracted on: source of information; cause of erectile dysfunction; number of patients; patient characteristics; treatments; duration; outcomes; p values; date of study.

• Common side effects include headache, flushing, and nasal congestion.
• Serious side effects are rare but can include vision changes and priapism.
• Report any severe reactions to your doctor immediately.

A narrative synthesis, with some pooling where mean scores (for response to questions) and mean proportions are presented. The methods used to combine data are not presented in the report. No formal sildenafil tablet manforce 50 mg investigation of heterogeneity was carried out.

• Sildenafil is available by prescription only in most countries.
• The medication comes in various dosages, typically 25mg, 50mg, and 100mg.
• Adjust dosage as directed by your healthcare provider.

Seven were Phase III trials and 14 were Phase II trials. Penile rigidity (Phase II trials only, n=7): In all studies an increased duration of rigidity >60% was seen with increasing doses of sildenafil. Frequency of penetration: 9/9 RCTs showed statistically significant improvements with all doses of sildenafil compared to placebo. Increasing improvement was apparent with increasing dose over the range 25-100mg. Maintenance of erection after penetration: 9/9 RCTs showed a statistically significant improvement with all doses of sildenafil compared to placebo. General efficacy question: 21/21 RCTs reported an improvement in erections with sildenafil treatment (65-82% improved) compared to placebo (18-26% improved).

A dose-response relationship was seen over the dose range 25-100mg. Successful intercourse: Proportion of attempts at intercourse that were successful with sildenafil treatment increased compared to placebo treatment (6/9 RCTs list a positive outcome). One RCT found no increase in rates of attempted intercourse with sildenafil, despite increased success rates. Erections hard enough for intercourse: In 6/6 RCTs a significant improvement in the number of grade 3 and 4 erections was seen with sildenafil treatment. Partner's questionnaire: Generally increasing partner satisfaction was seen with increasing sildenafil dose (10-100mg).

Other Comments

To examine the effectiveness, safety and cost-effectiveness of sildenafil for the treatment of male erectile dysfunction. MEDLINE (1966 to June 1998), EMBASE (1988 to June 1998), Cochrane Library (Issue 3, 1998), PsycLIT (1996 to 1987 (sic)), National Research Register Interim version June 1998 and Pharm-line were all searched for articles containing the free-text terms "sildenafil" or "Viagra". The main Internet search engines were used using the terms "sildenafil" or "Viagra". The FDA centre for Drug Evaluation and Research, Joint Clinical Review for NDA-20-895 Viagra (Sildenafil), the BMJ, Lancet, JAMA, New England Journal of Medicine, BJGP, Drug, Inpharma and Scrip were all handsearched. Experts in the field and the manufacturers (Pfizer Ltd) were contacted. Quality of life: Statistically significant but small quality of life treatment effects were seen in 4 RCTs. Adverse effects: Adverse events reported in >2% (range 2% - 10%) of patient treated (2RCTs) include headache, flushing, dyspepsia, nasal congestion, urinary tract infection, abnormal vision, diarrhoea, dizziness, rash, respiratory tract infection. No cases of priapism were reported in any of the sildenafil studies. Cardiovascular: 18 RCTs give an overall incidence of cardiovascular events (other than flushing) of 3.0% with sildenafil and 3.5% with placebo. A comparable incidence rate was seen with sildenafil and placebo for serious cardiovascular events. No clinically significant changes in blood pressure, heart rate or ECG were seen with sildenafil treatment. Sildenafil had no direct effect on platelet aggregation.

Why is this medication prescribed?

^ "Generic Viagra developers queue up, but may have to wait". Archived from the original on 28 December 2021. ^ "Approved Viagra copies flood drugstores in Korea". ^ "Viagra prescriptions almost triple in a decade". Archived from the original on 1 July 2024. Death: 8/4500 patients treated with sildenafil in clinical trial died whilst taking the study drug or within 30 days of treatment. Six deaths were related to cardiovascular causes; in all cases it was plausible that the event was not related to the study drug. Diabetics: In general, smaller improvements were seen in diabetics than in those without diabetes.

Spinal cord injury: sildenafil appears to show comparable efficacy in patients with erectile dysfunction solely attributable to spinal cord injury (but with intact spinal cord-mediated reflexes) to patients with erectile dysfunction of broad-spectrum aetiology.

This article is cited by

"Viagra patent expires in June, says Brazilian court". Archived from the original on 17 April 2012. ^ "Revatio patent ruled invalid for lack of sound prediction and obviousness". Archived from the original on 3 March 2016. {{cite web}}: CS1 maint: deprecated archival service (link) ^ Teva Canada Ltd.

What should I know about sildenafil before taking it?

v. Pfizer Canada Inc., 2012 SCC 60 at par. "Supreme Court ruling could lead to cheaper versions of Viagra". Archived from the original on 10 March 2013. "Canadian Supreme court rules Viagra patent invalid". Radical prostatectomy: 4% of participants had erectile dysfunction as a result of radical prostatectomy.

What side effects can this medication cause?

^ "MHRA reclassifies Viagra Connect tablets to a Pharmacy medicine". ^ sildenafil 50 mg tab "Viagra to be available without prescription in UK". A service of the National Library of Medicine, National Institutes of Health. Database of Abstracts of Reviews of Effects (DARE): Quality-assessed Reviews [Internet]. York (UK): Centre for Reviews and Dissemination (UK); 1995-. A subgroup analysis of the patients appeared ot show lower efficacy with sildenafil, with 40-50% achieving improved erections. Age: Age did not affect response to sildenafil. A cost-utility analysis concluded that there is a great deal of uncertainty surrounding the assumptions used to calculate the cost/QALY of treating erectile dysfunction with sildenafil.

How should this medicine be used?

^ "Counterfeit Viagra Pills, Footwear, Belts, Car Emblems and Headphones Worth over $32 Million Seized at the LA/Long Beach Seaport U.S. Customs and Border Protection". Archived from the original on 12 October 2013. "Yes, There Is a Way to Get Generic Viagra". Archived from the original on 2 May 2016.

Oral sildenafil in the treatment of erectile dysfunction

"Pfizer Wins Viagra Patent Infringement Case Against Teva Pharmaceuticals". Archived from the original on 11 January 2015. ^ "Pfizer Completes Transaction to Combine Its Upjohn Business with Mylan". Retrieved 17 June 2024 – via Business Wire. Archived from the original on 17 June 2024. The best estimate was approximately £7,000/QALY. Sensitivity analysis around the assumptions produced a range of cost/QALYs within the £3,000-£20,000/QALY "strongly supported" decision band used by the Development and Evaluation Committee.

Where to buy Sildenafil Citrate

^ "Actavis Launches Generic Viagra in Europe as Patents Expire". Archived from the original on 29 October 2013. "What Will Happen When Viagra Goes Generic?". Archived from the original on 23 April 2011. ^ "Is Viagra about to lose its pulling power in the UK?".

What should I tell my healthcare provider before taking sildenafil?

Archived from the original on 30 October 2013. Archived from the original on 22 August 2009. Archived from the original on 25 June 2007. "Viagra from the pharmacist: insight from reclassification in New Zealand". Archived from the original on 17 May 2021. All trials showed a statistically significant improvement in erectile function in patients using sildenafil compared to placebo.