What is Viagra?
Pharmacokinetic interactions between sildenafil and saquinavir/ritonavir.
What is sildenafil?
Early sildenafil dose optimization and personalized instruction improves the frequency, flexibility, and success of sexual intercourse in men with erectile dysfunction. Lowy M, Collins S, Bloch MT, Gillman M, Lording DW, Sutherland P et al. Quality of erection questionnaire correlates: change in erection quality with erectile function, hardness, and psychosocial measures in men treated with sildenafil for erectile dysfunction. Effect of sildenafil citrate on the male sexual experience assessed with the Sexual Experience Questionnaire; a multicenter, double-blind, placebo-controlled trial with open-label extension. Validation of the Erection Hardness Score (EHS).
What causes an erection?
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. Development and validation of the Self-Esteem And Relationship (SEAR) questionnaire in erectile dysfunction. Comparison between sildenafil-treated subjects with erectile dysfunction and control subjects on the Self-Esteem And Relationship Questionnaire. Sildenafil citrate improves self-esteem, confidence, and relationships in men with erectile dysfunction: results from an international, multi-center, double-blind, placebo-controlled trial. Pharmacology and drug interaction effects of the phosphodiesterase 5 inhibitors: focus on alpha-blocker interactions.
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Viagra Generic | 150mg | 20 Pills | 55.02€ 52.40€ | |
| Viagra Generic | 25mg | 30 + 4 Pills | 47.97€ 45.69€ | |
| Viagra Generic | 150mg | 90 + 6 Pills | 147.18€ 140.17€ | |
| Kamagra Oral Jelly | 100mg | 90 + 8 Sachets | 303.56€ 289.10€ | |
| Viagra Generic | 150mg | 180 + 10 Pills | 236.46€ 225.20€ | |
| Kamagra Oral Jelly | 100mg | 110 + 9 Sachets | 334.87€ 318.92€ | |
| Viagra Generic | 25mg | 180 + 6 Pills | 154.93€ 147.55€ | |
| Viagra Generic | 150mg | 30 + 2 Pills | 72.32€ 68.88€ | |
| Kamagra Soft Tabs | 100mg | 32 Pills | 120.11€ 114.39€ | |
| Viagra Generic | 100mg | 90 + 6 Pills | 129.02€ 122.88€ |
These studies were funded by Pfizer Inc.
- The original sildenafil formulation was developed in the 1980s and approved in the 1990s.
- Sildenafil is also marketed for pulmonary arterial hypertension under different brand names.
- The 100g dose is not standard; typical prescriptions are measured per tablet.
- Misuse or abuse of sildenafil can lead to psychological dependency or health risks.
- Always consult a healthcare provider to determine if sildenafil is appropriate for your condition.
Editorial sildenafil for women support was provided by Deborah M Campoli-Richards, BSPHA, RPh, at Complete Healthcare Communications, Inc and was funded by Pfizer. Peter Ströberg is a scientific study/trial investigator for Pfizer.
What happens if I overdose?
The similarity in outcomes between the two regimens is not surprising given that almost 90% of the men who initiated treatment with flexible-dose sildenafil titrated to a dose of 100 mg after 2 weeks. The apparent difference in outcomes on the SEAR, SEX-Q and EDITS between the two regimens may represent cultural differences between the European and Asian population treated with 100 mg fixed-dose sildenafil and the US (mainly white) population treated with flexible-dose sildenafil. The SEAR, SEX-Q and EDITS assess health-related quality-of-life concepts, which are likely to be more susceptible to cultural differences than are more functional concepts, such as those assessed by the EHS and IIEF. Cultural differences on SEAR responses were published previously.13, 17 Given that almost 90% of the men who initiated treatment with flexible-dose sildenafil titrated to a dose of 100 mg after 2 weeks, initiating treatment with 100-mg sildenafil should greatly decrease the need for dose titration and, in those men for whom a dose of 50 mg might prove ineffective, may decrease the risk of discouragement and treatment abandonment because of inadequate dosing. The high proportion of men titrating to a dose of 100 mg supports earlier results, which showed that 100-mg sildenafil produced optimal erection hardness (fully hard and rigid) in a substantial proportion of men with ED2 and that 100 mg was the dose used by most men in dose-optimization studies.3, 4, 6 Several studies reported that titration to the highest well-tolerated approved dose and/or early dose optimization contributed to treatment success.6 Treatment optimization, which includes selecting the most appropriate dose, ‘…may promote treatment adherence and thus facilitate optimal patient outcomes.’6 Some patients who are prescribed sildenafil for ED in the clinical practice setting neither refill their initial prescription nor seek alternative therapies.18, 19 For example, an analysis of sildenafil use during the first 24 weeks of availability at a large health maintenance organization revealed that only 61% of patients filled a second sildenafil prescription within 3 months of their first prescription.20 In addition, in a large dose-optimization study in which sildenafil was initiated at a dose of 50 mg for 4 weeks according to the package instructions, 14% (153/1109) failed to return for the second visit for scheduled dosage optimization.6 In several studies, incorrect administration, including suboptimal dosing, was the most frequent cause of nonresponse to sildenafil.6 An initial dose of sildenafil 100 mg may not be appropriate in some men.
What is sildenafil used for?
An initial dose of sildenafil 100 mg appears to be at least as efficacious and well tolerated as an initial dose of 50 mg with the option to titrate to the optimal dose. Furthermore, an initial dose of 100 mg may reduce the need for dose titration and may prevent discouragement and treatment abandonment in men for whom a dose of 50 mg is insufficient. This suggests prescription of an initial dose of 100 mg, except in those for whom it is inappropriate. Correlations between increased erection hardness and improvements in emotional well-being and satisfaction outcomes in men treated with sildenafil citrate for erectile dysfunction. Steidle C, McCullough A, Kaminetsky J, Crowley A, Siegel R, Deriesthal H et al. Nam Cheol Park has nothing to declare.
About Sildenafil and Viagra
However, for the fixed-dose sildenafil 100-mg group relative to the flexible-dose sildenafil group there was a greater improvement from baseline in SEAR scores (8–16 point difference between the groups across SEAR components) and in SEX-Q scores (3–7 point difference between the groups across SEX-Q domains), a greater least square mean±s.e. EDITS Index (78.4±2.0 and 66.5±3.3, respectively), and a larger estimated percentage of men who were satisfied with sildenafil treatment (dichotomized EDITS scores: 93 vs 69%). The SEX-Q total score, which assesses the sexual experience overall in the domains of erection, individual satisfaction and couples satisfaction, correlated positively with all other outcomes in both trials (Table 3). In both trials, most AEs were mild or moderate in severity. The most frequently reported AEs were flushing, dyspepsia, headache and nasal congestion in the fixed-dose trial, which occurred at similar frequencies in the sildenafil 50-mg and 100-mg groups, and flushing, headache, nasal congestion and dizziness in the flexible-dose trial (Table 4).
What does Viagra do to men?
No treatment-related serious or severe AEs were reported in the sildenafil arms. As reported previously, sildenafil, whether initiated at a fixed dose of 50 or 100 mg,7 or at a dose of 50 mg and titrated as needed up to 100 mg,8 was significantly more effective than placebo in the treatment of ED, and there were additional benefits to the use of 100 mg fixed-dose sildenafil compared with 50 mg fixed-dose sildenafil.8 Although definitive statements about the comparative efficacy of 100-mg fixed-dose sildenafil and the flexible-dose sildenafil regimen are limited by the fact that the regimens were not compared within a controlled trial and the protocols of the two trials collated herein were not identical, the results of the current collated report suggest that an initial dose of sildenafil 100 mg is at least as effective and well tolerated as an initial dose of 50 mg with the option to titrate as needed. Definitive statements about the comparative tolerability of 100-mg fixed-dose sildenafil and the flexible-dose sildenafil regimen are also limited by the collated nature of the data presented in this report, although the low rate of discontinuation because of treatment-related AEs suggests that both regimens are generally well tolerated. The results of the current report are generalizable to the population of men with ED. For the 100-mg fixed-dose regimen relative to the flexible-dose regimen, there was a similar increase from baseline in the percentage of EHS 4 erections and EHS 3 or 4 erections, a similar 150mg sildenafil for sale improvement from baseline in IIEF scores, a greater improvement from baseline in SEAR scores and SEX-Q scores, and a higher EDITS Index; approximately one-third more men in the 100-mg fixed-dose vs the flexible-dose regimen were satisfied with their sildenafil treatment. Dana L.
How Often Can You Take Sildenafil in a Day?
The diffusion of a novel therapy into clinical practice: the case of sildenafil. Muirhead GJ, Wilner K, Colburn W, Haug-Pihale G, Rouvieux B . The effects of age and renal and hepatic impairment on the pharmacokinetics of sildenafil citrate. Muirhead GJ, Faulkner S, Harness JA, Taubel J . The effects of steady-state erythromycin and azithromycin on the pharmacokinetics of sildenafil in healthy volunteers. Creanga was a paid consultant to Pfizer in connection with the statistical analyses performed in this study. Vera J.
- Sildenafil is a phosphodiesterase type 5 inhibitor specific to erectile dysfunction.
- It has been proven effective in improving sexual performance in men with ED.
- The medication is contraindicated for men taking certain antihypertensives or antidepressants.
- The onset of action varies depending on whether taken on an empty stomach.
- Always adhere to the prescribed amount; excess intake can reduce efficacy or cause harm.
Stecher is an employee of Pfizer. This work is licensed under the Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License.
Key Takeaways:
Mulhall JP, King R, Kirby M, Hvidsten K, Symonds T, Bushmakin AG et al. Evaluating sildenafil from canada the sexual experience in men: validation of the Sexual Experience Questionnaire. Development and validation of the Quality of Erection Questionnaire. Althof SE, Corty EW, Levine SB, Levine F, Burnett AL, McVary K et al. EDITS: development of questionnaires for evaluating satisfaction with treatments for erectile dysfunction.
Is Viagra’s dosage based on weight?
O'Leary MP, Althof SE, Cappelleri JC, Crowley A, Sherman N, Duttagupta S . Self-esteem, confidence and relationship satisfaction of men with erectile dysfunction treated with sildenafil citrate: a multicenter, randomized, parallel group, double-blind, placebo controlled study in the United States. What to learn about sildenafil in the treatment of erectile dysfunction from 3-year clinical experience. Achieving treatment optimization with sildenafil citrate (Viagra) in patients with erectile dysfunction. Harrold LR, Gurwitz JH, Field TS, Andrade SE, Fish LS, Jarry PD et al. To view a copy of this license, visit Ströberg, P., Kaminetsky, J., Park, N. et al. Hardness, function, emotional well-being, satisfaction and the overall sexual experience in men using 100-mg fixed-dose or flexible-dose sildenafil citrate.
- Sildenafil can sometimes cause nasal congestion or stomach upset as side effects.
- The medication's safety profile has been extensively studied in clinical trials.
- Combining sildenafil with other medications can increase the risk of adverse effects.
- Pfizer continues to research new applications and formulations for sildenafil.
- Education about proper use of sildenafil ensures safer treatment for erectile dysfunction.
Enhanced understanding of the relationship between erection and satisfaction in ED treatment: application of a longitudinal mediation model International Journal of Impotence Research (2014) Changes in sexual inhibition and excitation during PDE5I therapy International Journal of Impotence Research (2014)