Combination Therapy of Tadalafil 2.5mg Plus Sildenafil 25mg Versus Tadalafil 5 mg Monotherapy for Treatment of Erectile Dysfunction: A Randomized, Placebo-Controlled Double-Blinded Cross-Over Study
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Tadalafil 2.5 mg, Sildenafil 25 mg, Tadalafil 5 mg.
- Who it may be relevant to
- Registry conditions: Erectile Dysfunction. Basic parameters: 18 years — 60 years · Male.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Center list to be confirmed — check the primary protocol.
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
Erectile dysfunction (ED) is characterized by the persistent inability to attain or sustain an erection adequate for satisfactory sexual intercourse. As one of the most common male sexual health disorders, ED exhibits a global prevalence of moderate-to-severe cases ranging between 5% and 20% (1). Although erectile dysfunction is not life-threatening, it can substantially impair both physical and psychosocial well-being, exerting a notable negative impact on the quality of life of affected individuals and their partners. ED is a multifactorial condition associated with vascular, psychological, and, in some cases, idiopathic causes (2). Management strategies encompass lifestyle modification, pharmacotherapy particularly with phosphodiesterase type 5 (PDE5) inhibitors, vacuum erection devices, intracavernosal injections, and surgical options (1). ED frequently coexists with metabolic and cardiovascular disorders and shows a rising incidence with advancing age and the presence of cardiovascular risk factors (2). Both physiological and psychological mechanisms may underlie the condition; psychological etiologies tend to be more prevalent in younger, otherwise healthy individuals (3). The presence of preserved nocturnal erections is a key clinical indicator suggestive of a psychogenic origin of ED (4). Phosphodiesterase-5 inhibitors (PDE5Is) represent the primary pharmacologic therapy for ED. Currently, seven PDE5Is (avanafil, lodenafil, mirodenafil, sildenafil, tadalafil, udenafil, and vardenafil) are available in varying dosages and formulations. Their efficacy has been consistently demonstrated in randomized controlled trials (5)(6). Sildenafil exhibits a rapid onset of action, typically beginning 30 minutes after administration, with an effective duration of 4 to 6 hours and a maximum pharmacological activity lasting up to 12 hours (7). While sildenafil is effective in managing erectile dysfunction, discontinuation rates among responders range from 20% to 50% (8). In contrast, tadalafil, a selective and long-acting PDE5 inhibitor introduced in 2003, has a slightly faster onset around 20 minutes and is recommended to be taken at least 30 minutes before sexual activity. Notably, tadalafil has the longest duration of action among PDE5 inhibitors, with effects lasting up to 72 hours. Approximately 52% of patients are able to achieve successful intercourse within 30 minutes of ingestion (9). The purpose of this study is to evaluate the efficacy and safety of Tadalafil 2.5 mg plus sildenafil 25 mg as a combination therapy versus tadalafil 5 mg monotherapy for Treatment of Erectile Dysfunction
Interventions
- Drug Tadalafil 2.5 mg
patients recived Tadalafil 2.5 mg daily - Drug Sildenafil 25 mg
patients recived Sildenafil 25 mg daily - Drug Tadalafil 5 mg
patients recived Tadalafil 5 mg daily
Primary outcome measures
- Change in Erectile Function (IIEF-5 Score) [Time frame: 12 week]
Eligibility criteria
Inclusion criteria
- -Men aged 18-70 years with a clinical diagnosis of erectile dysfunction (ED) for ≥3 months.
- International Index of Erectile Function (IIEF-5) score ≤21.
- Stable sexual relationship for ≥3 months.
- Willingness to adhere to the study protocol and provide informed consent.
- No prior use of PDE5 inhibitors within 4 weeks before enrollment.
Exclusion criteria
- -Severe cardiovascular disease (uncontrolled hypertension, recent MI/stroke).
- Hypersensitivity to tadalafil, sildenafil, or any PDE5 inhibitor.
- Severe hepatic/renal impairment (e.g., CrCl <30 mL/min, Child-Pugh C).
- Concomitant use of nitrates, strong CYP3A4 inhibitors (e.g., ritonavir, ketoconazole).
- History of priapism, penile deformities, or radical prostatectomy.
- Major psychiatric disorders affecting compliance.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Allocation
- Randomized
- Model
- Parallel assignment
- Masking
- Quadruple blind
- Primary purpose
- Treatment
Study locations
Center list to be confirmed — check the primary protocol.
Identifiers
NCT: NCT07177326 · Tadal+Silden VSTadal ED