Vardenafil (English Wikipedia)

Bischoff E (June 2004). "Potency, selectivity, and consequences of nonselectivity of PDE inhibition". International Journal of Impotence Research. 16 (Suppl 1): S11–S14. doi:10.1038/sj.ijir.3901208. PMID 15224129.
Aversa A, Pili M, Francomano D, Bruzziches R, Spera E, La Pera G, et al. (July 2009). "Effects of vardenafil administration on intravaginal ejaculatory latency time in men with lifelong premature ejaculation". International Journal of Impotence Research. 21 (4): 221–7. doi:10.1038/ijir.2009.21. PMID 19474796. S2CID 26078130.
Kloner RA (December 2005). "Pharmacology and drug interaction effects of the phosphodiesterase 5 inhibitors: focus on alpha-blocker interactions". The American Journal of Cardiology. 96 (12B): 42M–46M. doi:10.1016/j.amjcard.2005.07.011. PMID 16387566.
Tucker J, Fischer T, Upjohn L, Mazzera D, Kumar M (October 2018). "Unapproved Pharmaceutical Ingredients Included in Dietary Supplements Associated With US Food and Drug Administration Warnings". JAMA Network Open. 1 (6): e183337. doi:10.1001/jamanetworkopen.2018.3337. PMC 6324457. PMID 30646238.

fda.gov (Global: 447^th place; English: 338^th place)

Stimmel GL, Gutierrez MA. "Counseling Patients About Sexual Issues: Drug-Induced Priapism". Medscape. Retrieved December 6, 2010.

Bischoff E (June 2004). "Potency, selectivity, and consequences of nonselectivity of PDE inhibition". International Journal of Impotence Research. 16 (Suppl 1): S11–S14. doi:10.1038/sj.ijir.3901208. PMID 15224129.
Aversa A, Pili M, Francomano D, Bruzziches R, Spera E, La Pera G, et al. (July 2009). "Effects of vardenafil administration on intravaginal ejaculatory latency time in men with lifelong premature ejaculation". International Journal of Impotence Research. 21 (4): 221–7. doi:10.1038/ijir.2009.21. PMID 19474796. S2CID 26078130.
Kloner RA (December 2005). "Pharmacology and drug interaction effects of the phosphodiesterase 5 inhibitors: focus on alpha-blocker interactions". The American Journal of Cardiology. 96 (12B): 42M–46M. doi:10.1016/j.amjcard.2005.07.011. PMID 16387566.
Carson CC (February 2006). "PDE5 inhibitors: are there differences?". The Canadian Journal of Urology. 13 (Suppl 1): 34–9. PMID 16526979.
Lepor H, Lepor NE, Hill LA, Trohman RG (2008). "The QT Interval and Selection of Alpha-Blockers for Benign Prostatic Hyperplasia". Reviews in Urology. 10 (2): 85–91. PMC 2483321. PMID 18660858.
Tucker J, Fischer T, Upjohn L, Mazzera D, Kumar M (October 2018). "Unapproved Pharmaceutical Ingredients Included in Dietary Supplements Associated With US Food and Drug Administration Warnings". JAMA Network Open. 1 (6): e183337. doi:10.1001/jamanetworkopen.2018.3337. PMC 6324457. PMID 30646238.

Aversa A, Pili M, Francomano D, Bruzziches R, Spera E, La Pera G, et al. (July 2009). "Effects of vardenafil administration on intravaginal ejaculatory latency time in men with lifelong premature ejaculation". International Journal of Impotence Research. 21 (4): 221–7. doi:10.1038/ijir.2009.21. PMID 19474796. S2CID 26078130.