The DOI matches its Crossref record; 5 of the 5 references it cites were found in a registry or an index.
Efficacy and Safety of Daily Tadalafil in Men with Erectile Dysfunction Previously Unresponsive to On-Demand Tadalafil
Abstract
Objective: To assess the efficacy and safety of daily tadalafil, a potent selective phosphodiesterase 5 inhibitor, for the treatment of erectile dysfunction (ED) in men previously unresponsive to on-demand tadalafil. Materials and Methods: A total of 112 men with a mean age of 63 (range 21–79) and moderate to severe ED of various aetiologies were treated with tadalafil, taken on a daily basis at flexible daily doses of 10 and 20 mg for 12 weeks. The three primary outcomes were changes from the pretreatment and on-demand tadalafil baseline in the erectile function domain of the International Index of Erectile Function and the proportion of yes responses to questions 2 and 3 of the Sexual Encounter Profile. Additional efficacy instruments included a Global Assessment Question administered at completion of the study. Results: Compared with pretreatment and on-demand tadalafil baseline, daily dosed tadalafil significantly enhanced all efficacy outcome variables. Patients receiving daily tadalafil (10 mg) experienced a significant mean improvement of 12.8 and 8.2 in the International Index of Erectile Function erectile function domain score from baseline (P < 0.001) and from on-demand tadalafil, respectively (P < 0.001). Fifty-eight percent of intercourse attempts (Sexual Encounter Profile question 3) were successfully completed (P < 0.001 vs. pretreatment baseline, P < 0.001 vs. on-demand tadalafil). Improved erections at end point were reported by 69% of men compared with 42% of men with on-demand tadalafil. Daily tadalafil was well tolerated with headache, dyspepsia, and facial flushing as the most frequent adverse events. Conclusion: Daily tadalafil (10/20 mg) was effective and well tolerated in this study population and is an effective salvage for previous on-demand tadalafil nonresponders.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“McMahon23 previously treated non-responders to on-demand tadalafil with continuous use on a daily basis at flexible doses of 10 or 20 mg of tadalafil for 12 weeks. Daily tadalafil significantly improved (p<0.001) the IIEF EF domain score and Sexual Encounter Profile question 3, compared with on-demand tadalafil.”
From Treatment Strategy for Non-Responders to PDE5 Inhibitors (2013) · cites this paper as [23]
In the citing paper
“Several recent studies have shown a significant treatment benefit from once-daily, low-dose tadalafil (McMahon 2004; McMahon 2005; Porst et al 2006; Rajfer et al 2007; Hatzichristou et al 2008; Porst et al 2008).”
From Tadalafil in the treatment of erectile dysfunction (2008) · cites this paper as McMahon 2004
In the citing paper
“The longer half-life provides a steady state of serum drug concentration with low dose, once-daily administration, a benefit not shared with the other two PDE5 inhibitors (McMahon 2004; McMahon 2005; Porst et al 2006; Porst et al 2008; Rajfer et al 2007).”
From Tadalafil in the treatment of erectile dysfunction (2008) · cites this paper as McMahon 2004
In the citing paper
“Compared with 42% of men with on-demand tadalafil, 69% of men with once-daily tadalafil reported improved erections at the endpoint (McMahon 2004).”
From Tadalafil in the treatment of erectile dysfunction (2008) · cites this paper as McMahon 2004
In the citing paper
“Patients taking tadalafil 10 mg once-daily improved the IIEF-EF score 12.8 from the no-treatment baseline and 8.2 from the on-demand treatment baseline (p < 0.001).”
From Tadalafil in the treatment of erectile dysfunction (2008) · cites this paper as McMahon 2004
1 more claim about this paper
Create a free account to see every claim other papers make about this one.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
Sexual Dysfunction in the United States: Prevalence and Predictors
Laumann, E. O., Paik, A., & Rosen, R. C. (1999) · JAMA · doi:10.1001/jama.281.6.537 · Cited by 5,119
Impotence and Its Medical and Psychosocial Correlates: Results of the Massachusetts Male Aging Study
Feldman, H. A., Goldstein, I., Hatzichristou, D. G., Krane, R. J., & McKinlay, J. B. (1994) · Journal of Urology · doi:10.1016/s0022-5347(17)34871-1 · Cited by 5,074
Oral Sildenafil in the Treatment of Erectile Dysfunction
Goldstein, I., Lue, T. F., Padma-Nathan, H., Rosen, R. C., Steers, W. D., & Wicker, P. A. (1998) · New England Journal of Medicine · doi:10.1056/nejm199805143382001 · Cited by 2,120
Aversa, A., Isidori, A. M., Spera, G., Lenzi, A., & Fabbri, A. (2003) · Clinical Endocrinology · doi:10.1046/j.1365-2265.2003.01764.x · Cited by 343
Kalinchenko, S. Y., Kozlov, G. I., Gontcharov, N. P., & Katsiya, G. V. (2003) · The Aging Male · doi:10.1080/tam.6.2.94.99 · Cited by 173
Research works printed but not linked: 36
- Virag, 1985, Is impotence an arterial disorder? A study of arterial risk factors in 440 impotent men, Lancet, 1, 181, 10.1016/S0140-6736(85)92023-9 · DOI · Paper page
- Jensen, 1999, The prevalence and etiology of impotence in 101 male hypertensive outpatients, Am J Hypertens, 12, 271, 10.1016/S0895-7061(98)00225-8 · DOI
- Azadzoi, 1991, Hypercholesterolemia impairs endothelium-dependent relaxation of rabbit corpus cavernosum smooth muscle, J Urol, 146, 238, 10.1016/S0022-5347(17)37759-5 · DOI
- Azadzoi, 1992, Erectile dysfunction due to atherosclerotic vascular disease: The development of an animal model, J Urol, 147, 1675, 10.1016/S0022-5347(17)37676-0 · DOI
- Saenz de Tejada, 1989, Impaired neurogenic and endothelium-mediated relaxation of penile smooth muscle from diabetic men with impotence, N Engl J Med, 320, 1025, 10.1056/NEJM198904203201601 · DOI
- Kaiser, 2004, Impaired brachial artery endothelium-dependent and -independent vasodilation in men with erectile dysfunction and no other clinical cardiovascular disease, J Am Coll Cardiol, 43, 179, 10.1016/j.jacc.2003.07.042 · DOI
- Brock, 2002, Efficacy and safety of tadalafil for the treatment of erectile dysfunction: Results of integrated analyses, J Urol, 168, 1332, 10.1016/S0022-5347(05)64442-4 · DOI · Paper page
- Porst, 2003, Efficacy of tadalafil for the treatment of erectile dysfunction at 24 and 36 hours after dosing: A randomized controlled trial, Urology, 62, 121, 10.1016/S0090-4295(03)00359-5 · DOI · Paper page
- Atiemo, 2003, Salvage of sildenafil failures referred from primary care physicians, J Urol, 170, 2356, 10.1097/01.ju.0000096221.67967.ae · DOI
- McMahon, 2002, High dose sildenafil citrate as a salvage therapy for severe erectile dysfunction, Int J Impot Res, 14, 533, 10.1038/sj.ijir.3900936 · DOI
- McMahon, 1999, Treatment of intracorporeal injection nonresponse with sildenafil alone or in combination with triple agent intracorporeal injection therapy, J Urol, 162, 1992, 10.1016/S0022-5347(05)68085-8 · DOI
- Mydlo, 2000, Initial results utilizing combination therapy for patients with a suboptimal response to either alprostadil or sildenafil monotherapy, Eur Urol, 38, 30, 10.1159/000020248 · DOI
- Saenz de Tejada, 2002, Effects of tadalafil on erectile dysfunction in men with diabetes, Diabetes Care, 25, 2159, 10.2337/diacare.25.12.2159 · DOI · Paper page
- Rendell, 1999, Sildenafil for treatment of erectile dysfunction in men with diabetes: A randomized controlled trial, JAMA, 281, 421, 10.1001/jama.281.5.421 · DOI
- Stuckey, 2003, Sildenafil citrate for treatment of erectile dysfunction in men with type 1 diabetes: Results of a randomized controlled trial, Diabetes Care, 26, 279, 10.2337/diacare.26.2.279 · DOI
- Goldstein, 2003, Vardenafil, a new phosphodiesterase type 5 inhibitor, in the treatment of erectile dysfunction in men with diabetes: A multicenter double-blind placebo-controlled fixed-dose study, Diabetes Care, 26, 777, 10.2337/diacare.26.3.777 · DOI
- Emmick, 2002, Overview of the cardiovascular effects of tadalafil, Eur Heart J, 4, H32, 10.1016/S1520-765X(02)90050-7 · DOI
- Aranda, 2004, Erectile dysfunction in essential arterial hypertension and effects of sildenafil: Results of a Spanish national study, Am J Hypertens, 17, 139, 10.1016/j.amjhyper.2003.09.006 · DOI
- Steers, 1998, Sildenafil (Viagra) is effective in the treatment of severe male erectile dysfunction, Int J Impot Res, 10, S49
- Brock, 2003, Safety and efficacy of vardenafil for the treatment of men with erectile dysfunction after radical retropubic prostatectomy, J Urol, 170, 1278, 10.1097/01.ju.0000086947.00547.49 · DOI
- Lowentritt, 1999, Sildenafil citrate after radical retropubic prostatectomy, J Urol, 162, 1614, 10.1016/S0022-5347(05)68179-7 · DOI
- Hong, 1999, Time dependent patient satisfaction with sildenafil for erectile dysfunction (ED) after nerve-sparing radical retropubic prostatectomy (RRP), Int J Impot Res, 11, S15, 10.1038/sj.ijir.3900466 · DOI
- Anderson, 1991, Cardiovascular disease risk profiles, Am Heart J, 121, 293, 10.1016/0002-8703(91)90861-B · DOI · Paper page
- DeBusk, 2000, Management of sexual dysfunction in patients with cardiovascular disease: Recommendations of the Princeton Consensus Panel, Am J Cardiol, 86, 175, 10.1016/S0002-9149(00)00896-1 · DOI · Paper page
- El-Galley, 2001, Long-term efficacy of sildenafil and tachyphylaxis effect, J Urol, 166, 927, 10.1016/S0022-5347(05)65866-1 · DOI
- Steers, 2001, Assessment of the efficacy and safety of Viagra (sildenafil citrate) in men with erectile dysfunction during long-term treatment, Int J Impot Res, 13, 261, 10.1038/sj.ijir.3900714 · DOI
- Moreland, 1999, Sildenafil citrate, a selective phosphodiesterase type 5 inhibitor, Trends Endocrinol Metab, 10, 97, 10.1016/S1043-2760(98)00127-1 · DOI
- Gonzalez, 1999, Sildenafil causes a dose- and time-dependent downregulation of phosphodiesterase type 6 expression in the rat retina, Int J Impot Res, 11, S9, 10.1038/sj.ijir.3900465 · DOI
- Lin, 2002, Human PDE5A gene encodes three PDE5 isoforms from two alternate promoters, Int J Impot Res, 14, 15, 10.1038/sj.ijir.3900802 · DOI
- Lin, 2003, Up and down-regulation of phosphodiesterase-5 as related to tachyphylaxis and priapism, J Urol, 170, S15, 10.1097/01.ju.0000075500.11519.e8 · DOI
- Ferrini, 2004, Long-term treatment with high doses of sildenafil does not up-regulate the levels of phosphodiesterase 5 (PDE5) in the rat penis, J Urol, 171, 424, 10.1016/S0022-5347(18)38816-5 · DOI
- Behr-Roussel, 2004, Chronic sildenafil enhances erectile responses and endothelium-dependent corporal relaxations of normal rats: Lack of tachyphylaxis, J Urol, 171, 425, 10.1016/S0022-5347(18)38819-0 · DOI
- Halcox, 2002, The effect of sildenafil on human vascular function, platelet activation, and myocardial ischemia, J Am Coll Cardiol, 40, 1232, 10.1016/S0735-1097(02)02139-3 · DOI · Paper page
- Desouza, 2002, Acute and prolonged effects of sildenafil on brachial artery flow-mediated dilatation in type 2 diabetes, Diabetes Care, 25, 1336, 10.2337/diacare.25.8.1336 · DOI
- Kimura, 2003, PDE5 inhibitor sildenafil citrate augments endothelium-dependent vasodilation in smokers, Hypertension, 41, 1106, 10.1161/01.HYP.0000068202.42431.CC · DOI
- Katz, 2000, Acute type 5 phosphodiesterase inhibition with sildenafil enhances flow-mediated vasodilation in patients with chronic heart failure, J Am Coll Cardiol, 36, 845, 10.1016/S0735-1097(00)00790-7 · DOI · Paper page
Cited by
Tadalafil in the treatment of erectile dysfunction
Coward, R., & Carson, C. (2008) · Therapeutics and Clinical Risk Management · doi:10.2147/tcrm.s3336 · Cited by 138
Treatment Strategy for Non-Responders to PDE5 Inhibitors
Park, N. C., Kim, T. N., & Park, H. J. (2013) · The World Journal of Men's Health · doi:10.5534/wjmh.2013.31.1.31 · Cited by 41
El Taieb, M., Hegazy, E., & Ibrahim, A. (2019) · The Journal of Sexual Medicine · doi:10.1016/j.jsxm.2019.06.009 · Cited by 22
Metadata
- Authors
- McMahon, C.
- Venue
- The Journal of Sexual Medicine
- Publisher
- Oxford University Press (OUP)
- Published
- 2004-11-01
- Volume
- 1
- Issue
- 3
- Pages
- 292-300
- ISSN
- 1743-6109
- 1743-6095
- Cited by
- 98
- References
- 5
- Language
- en
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Efficacy and Safety of Daily Tadalafil in Men with Erectile Dysfunction Previously Unresponsive to On-Demand Tadalafil. https://app.cochat.ai/papers/10.1111/j.1743-6109.04042.x
- The paper
- McMahon, C. (2004). Efficacy and Safety of Daily Tadalafil in Men with Erectile Dysfunction Previously Unresponsive to On-Demand Tadalafil. The Journal of Sexual Medicine. https://doi.org/10.1111/j.1743-6109.04042.x
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.