TY - JOUR
T1 - Selectivity of Avanafil, a PDE5 Inhibitor for the Treatment of Erectile Dysfunction
T2 - Implications for Clinical Safety and Improved Tolerability
AU - Wang, Run
AU - Burnett, Arthur L.
AU - Heller, Warren H.
AU - Omori, Kenji
AU - Kotera, Jun
AU - Kikkawa, Kohei
AU - Yee, Shiyin
AU - Day, Wesley W.
AU - Didonato, Karen
AU - Peterson, Craig A.
N1 - Funding Information:
KnowledgePoint360 Group, LLC provided writing, editorial, and graphics support for the development of this manuscript; their participation was funded by VIVUS, Inc.
PY - 2012/8
Y1 - 2012/8
N2 - Introduction. Phosphodiesterase type 5 (PDE5) inhibitors are indicated for the treatment of erectile dysfunction (ED); however, they can also inhibit other PDE isozymes, affecting their target tissues (e.g., PDE1: heart; PDE6: retina; and PDE11: skeletal muscle), which in some cases can cause unwanted side effects and therapy discontinuation. Data from in vitro studies showed that avanafil, a PDE5 inhibitor for the treatment of ED, exhibited strong selectivity toward PDE5 and against all other PDE isozymes. Aim. To review the inhibitory effects of avanafil for PDE isozymes compared with those of sildenafil, tadalafil, and vardenafil and to discuss these results within the context of clinical trial safety observations. Methods. Review of in vitro selectivity data for avanafil (published primary data from a peer-reviewed journal and scientific congress abstracts); PubMed search for pertinent publications on PDE5 inhibitor safety data; and review of published articles and abstracts from avanafil phase 1, 2, and 3 clinical trials. Main Outcome Measures. A low incidence of some PDE-related adverse events may be reflected by the high selectivity of avanafil against non-PDE5 isozymes. Results. Avanafil is highly selective toward PDE5 and against all other PDE isozymes tested. Lower selectivity against PDE1, PDE6, and PDE11 is consistent with results from randomized, placebo-controlled, phase 3 trials in which musculoskeletal and hemodynamic adverse events were reported in <2% of patients and no color vision-related abnormalities were reported with avanafil doses up to 200mg once daily. Conclusions. Data suggest that avanafil may confer a safety benefit, in terms of a lower incidence of specific adverse events, by virtue of its high specificity to PDE5 and its overall selectivity against other PDE isozymes.
AB - Introduction. Phosphodiesterase type 5 (PDE5) inhibitors are indicated for the treatment of erectile dysfunction (ED); however, they can also inhibit other PDE isozymes, affecting their target tissues (e.g., PDE1: heart; PDE6: retina; and PDE11: skeletal muscle), which in some cases can cause unwanted side effects and therapy discontinuation. Data from in vitro studies showed that avanafil, a PDE5 inhibitor for the treatment of ED, exhibited strong selectivity toward PDE5 and against all other PDE isozymes. Aim. To review the inhibitory effects of avanafil for PDE isozymes compared with those of sildenafil, tadalafil, and vardenafil and to discuss these results within the context of clinical trial safety observations. Methods. Review of in vitro selectivity data for avanafil (published primary data from a peer-reviewed journal and scientific congress abstracts); PubMed search for pertinent publications on PDE5 inhibitor safety data; and review of published articles and abstracts from avanafil phase 1, 2, and 3 clinical trials. Main Outcome Measures. A low incidence of some PDE-related adverse events may be reflected by the high selectivity of avanafil against non-PDE5 isozymes. Results. Avanafil is highly selective toward PDE5 and against all other PDE isozymes tested. Lower selectivity against PDE1, PDE6, and PDE11 is consistent with results from randomized, placebo-controlled, phase 3 trials in which musculoskeletal and hemodynamic adverse events were reported in <2% of patients and no color vision-related abnormalities were reported with avanafil doses up to 200mg once daily. Conclusions. Data suggest that avanafil may confer a safety benefit, in terms of a lower incidence of specific adverse events, by virtue of its high specificity to PDE5 and its overall selectivity against other PDE isozymes.
KW - Adverse Events
KW - Avanafil
KW - Erectile Dysfunction
KW - Inhibition
KW - PDE5 Inhibitor
KW - Selectivity
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U2 - 10.1111/j.1743-6109.2012.02822.x
DO - 10.1111/j.1743-6109.2012.02822.x
M3 - Article
C2 - 22759639
AN - SCOPUS:84864502944
SN - 1743-6095
VL - 9
SP - 2122
EP - 2129
JO - Journal of Sexual Medicine
JF - Journal of Sexual Medicine
IS - 8
ER -