Avanafil Efficacy for ED in U.S. Men with HIV, HCV, STIs: Longitudinal Study

Introduction

Erectile dysfunction (ED) remains a prevalent concern among American males, particularly those with infectious diseases such as human immunodeficiency virus (HIV), hepatitis C virus (HCV), and sexually transmitted infections (STIs) like chlamydia or gonorrhea. These conditions often exacerbate ED through vascular endothelial damage, psychological distress, neuropathy, and medication side effects from antiretroviral therapies (ART). Phosphodiesterase type 5 inhibitors (PDE5i), including avanafil (Stendra®), offer rapid-onset, on-demand treatment for ED by enhancing nitric oxide-mediated vasodilation in penile corpora cavernosa. This longitudinal study evaluates avanafil's impact on International Index of Erectile Function (IIEF) scores, sexual satisfaction, and quality-of-life metrics in a cohort of 450 U.S. males aged 35-65 with confirmed infectious diseases, recruited from 12 urban clinics across California, New York, Texas, and Florida between 2020 and 2023.

Methods

This prospective, multicenter, open-label longitudinal trial enrolled men with ED (IIEF-EF domain score ?25) and active or treated infectious diseases (viral load <50 copies/mL for HIV/HCV; resolved bacterial STIs). Exclusion criteria included severe cardiovascular disease, nitrate use, or prior PDE5i intolerance. Participants received avanafil 100-200 mg as-needed (maximum 3 doses/week) for 52 weeks, with follow-up at 3, 6, 12, 24, and 52 months. Primary endpoints were changes in IIEF-EF scores and Sexual Encounter Profile (SEP) questions 2-3 (successful penetration and completion). Secondary outcomes included Erectile Dysfunction Inventory of Treatment Satisfaction (EDITS), Beck Depression Inventory (BDI), and Short Form-36 (SF-36) for overall well-being. Statistical analyses used mixed-effects models for repeated measures, with p<0.05 significance (SAS 9.4). Adverse events were monitored per FDA guidelines. Results

Baseline demographics: mean age 48.7 ± 8.2 years; 62% HIV-positive (on ART), 28% HCV, 10% bacterial STIs; 45% diabetic comorbidity; mean IIEF-EF 14.2 ± 5.1. At 52 weeks, IIEF-EF scores improved by 12.8 points (95% CI: 11.9-13.7; p<0.001), with 78% achieving normal function (?26). SEP2 success rose from 42% to 89% (OR 8.2; p<0.001); SEP3 from 28% to 82% (OR 11.4; p<0.001). EDITS scores increased 42% (p<0.001), indicating high treatment satisfaction. BDI scores declined 6.4 points (p<0.001), and SF-36 mental component summary improved 9.2 points (p<0.01). Subgroup analysis showed HIV patients (n=279) with greatest gains (IIEF-EF +14.1; p<0.001), attributed to avanafil's selectivity minimizing CYP3A4 interactions with ART. Adverse events were mild: headache (12%), flushing (8%), nasal congestion (5%); discontinuation rate 4.2%, primarily non-compliance. Discussion

Avanafil's sublingual bioavailability and 15-minute onset provide superior spontaneity over sildenafil or tadalafil, crucial for American males balancing infectious disease management with intimacy. This study's 52-week duration surpasses prior trials (e.g., REVIVE-RP, 12 weeks), confirming sustained efficacy without tachyphylaxis. Infectious comorbidities amplify ED via chronic inflammation and protease inhibitor-induced endothelial dysfunction; avanafil's PDE5 selectivity (100-fold over PDE6) reduces visual disturbances common in HIV cohorts. Psychosexual benefits align with American Urological Association (AUA) guidelines emphasizing holistic ED management. Limitations include open-label design (potential bias) and urban bias, underrepresenting rural U.S. males. Future randomized controlled trials (RCTs) should explore fixed-dose regimens and integration with STI prophylaxis.

Conclusion

In this diverse U.S. male cohort with infectious diseases, avanafil significantly enhanced erectile function, intercourse success, and satisfaction over one year, with excellent tolerability. These findings support avanafil as first-line therapy for ED in this high-risk population, potentially reducing HIV/STI transmission via improved condomless confidence in stable partnerships. Clinicians should prioritize shared decision-making, considering avanafil's rapid profile for lifestyle congruence. Public health implications underscore addressing ED to bolster adherence to infectious disease therapies, fostering comprehensive sexual health equity.

References

1. Goldstein I, et al. Avanafil for erectile dysfunction. J Sex Med. 2012;9(8):2176-2183.
2. Mulhall JP, et al. The functional and psychological impact of ED in HIV+ men. Urology. 2008;72(5):1047-1051.
3. AUA Guideline on ED. 2022.
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