The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Sildenafil Failures May Be Due to Inadequate Patient Instructions and Follow-Up: A Study on 100 Non-Responders
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
“In one study of 100 consecutive sildenafil non-responders, 56 patients used sildenafil inappropriately: 45 had never used the highest recommended dose (100 mg); 32 had taken the pill with a full stomach right after a meal; 22 had taken the pill just before initiating sexual activity; and 12 were not aware that sexual stimulation was mandatory to achieve an erection.3”
From Treatment Strategy for Non-Responders to PDE5 Inhibitors (2013) · cites this paper as [3]
In the citing paper
“The reported efficacy of PDE5 inhibitors is about 70%, although it is significantly lower in difficult-to-treat subpopulations.”
From Treatment Strategy for Non-Responders to PDE5 Inhibitors (2013) · cites this paper as [3]
In the citing paper
“The reported efficacy of PDE5 inhibitors is about 70%, although it is significantly lower in difficult-to-treat subpopulations.”
From Treatment Strategy for Non-Responders to PDE5 Inhibitors (2013) · cites this paper as [3]
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
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
Research works printed but not linked: 16
- Lewis, 2001, Patient and partner satisfaction with Viagra (sildenafil citrate) treatment as determined by the Erectile Dysfunction Inventory of Treatment Satisfaction Questionnaire, Urology, 57, 960, 10.1016/S0090-4295(01)00945-1 · DOI
- Hatzichristou, 2001, Current treatments and emerging therapeutic approaches in male erectile dysfunction, BJU Int, 88, 11, 10.1046/j.1464-4096.2001.123.x · 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
- Hatzichristou, 2002, Diagnostic steps in the evaluation of patients with erectile dysfunction, J Urol, 168, 615, 10.1016/S0022-5347(05)64690-3 · DOI
- Hatzichristou, 2002, Sildenafil citrate: lessons learned from 3 years of clinical experience, Int J Impot Res, 14, S43, 10.1038/sj.ijir.3900805 · DOI · Paper page
- Martinez-Jabaloyas, 2001, Prognostic factors for response to sildenafil in patients with erectile dysfunction, Eur Urol, 40, 641, 10.1159/000049850 · DOI
- Souverein, 2002, Incidence and determinants of sildenafil (dis)continuation: the Dutch cohort of sildenafil users, Int J Impot Res, 14, 259, 10.1038/sj.ijir.3900883 · DOI
- Althof, 2002, When an erection alone is not enough: biopsychosocial obstacles to lovemaking, Int J Impot Res, 14, S99, 10.1038/sj.ijir.3900799 · DOI
- Pallas, 2000, A study using Viagra in a mental health practice, J Sex Marital Ther, 26, 41, 10.1080/009262300278632 · DOI
- Christiansen, 2000, Long-term efficacy and safety of oral Viagra (sildenafil citrate) in men with erectile dysfunction and the effect of randomised treatment withdrawal, Int J Impot Res, 12, 177, 10.1038/sj.ijir.3900527 · DOI
- McCullough, 2002, Achieving treatment optimization with sildenafil citrate (Viagra®) in patients with erectile dysfunction, Urology, 60, 28, 10.1016/S0090-4295(02)01688-6 · DOI
- The process of care model for evaluation and treatment of erectile dysfunction. The Process of Care Consensus Panel. Int J Impot Res 1999;11(2):59–70. · DOI
- Barada, 2001, Successful salvage of “Sildenafil (Viagra) failures”: Benefits of patient education and rechallenge with sildenafil, Int J Impot Res, 13, S49
- Atiemo, 2003, Salvage of sildenafil failures referred from primary care physicians, J Urol, 170, 2356, 10.1097/01.ju.0000096221.67967.ae · DOI
- Rutchik, 2001, Practice patterns in the diagnosis and treatment of erectile dysfunction among family practice physicians, Urology, 57, 146, 10.1016/S0090-4295(00)00880-3 · DOI · Paper page
- Utiger, 1998, A pill for impotence, N Engl J Med, 338, 1458, 10.1056/NEJM199805143382009 · DOI
Cited by
Guidelines on male sexual dysfunction: erectile dysfunction and premature ejaculation
Hatzimouratidis, K., Amar, E., Eardley, I., Giuliano, F., Hatzichristou, D., Montorsi, F., Vardi, Y., & Wespes, E. (2010) · European Urology · doi:10.1016/j.eururo.2010.02.020 · Cited by 1,223
Self-citationSalonia, A., Capogrosso, P., Boeri, L., Cocci, A., Corona, G., Dinkelman-Smit, M., Falcone, M., Jensen, C. F., Gül, M., Kalkanli, A., et al. (2025) · European Urology · doi:10.1016/j.eururo.2025.04.010 · Cited by 174
Carvalheira, A. A., Pereira, N. M., Maroco, J., & Forjaz, V. (2012) · The Journal of Sexual Medicine · doi:10.1111/j.1743-6109.2012.02787.x · Cited by 132
Treatment Options for Erectile Dysfunction
Brant, W. O., Bella, A. J., & Lue, T. F. (2007) · Endocrinology and Metabolism Clinics of North America · doi:10.1016/j.ecl.2007.02.001 · Cited by 51
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
Metadata
- Authors
- Hatzichristou, D., Moysidis, K., Apostolidis, A., Bekos, A., Tzortzis, V., Hatzimouratidis, K., & Ioannidis, E.
- Venue
- European Urology
- Publisher
- Elsevier BV
- Published
- 2005-04
- Volume
- 47
- Issue
- 4
- Pages
- 518-523
- ISSN
- 0302-2838
- Cited by
- 79
- References
- 1
- Language
- en
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
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: Sildenafil Failures May Be Due to Inadequate Patient Instructions and Follow-Up: A Study on 100 Non-Responders. https://app.cochat.ai/papers/10.1016/j.eururo.2004.12.005
- The paper
- Hatzichristou, D., Moysidis, K., Apostolidis, A., Bekos, A., Tzortzis, V., Hatzimouratidis, K., & Ioannidis, E. (2005). Sildenafil Failures May Be Due to Inadequate Patient Instructions and Follow-Up: A Study on 100 Non-Responders. European Urology. https://doi.org/10.1016/j.eururo.2004.12.005
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.
