Long-term tadalafil once daily in Chinese men with erectile dysfunction: a 2-year final analysis of a post-marketing, multicenter, randomized, open-label trial
(19) included 24 patients, 16 with normal findings on neurological examination, and 8 with diabetic neuropathy.
What do Penile Problems Look Like?
Ethics Committee approval for this study was obtained from the Ethics Committee of Health Sciences University, Antalya Training and Research Hospital (2020-352), and all steps were planned and conducted following the Declaration of Helsinki and its later amendments. Patients who started treatment for ED in the andrology outpatient clinic were referred to the study by the secretariat. We included patients with a history of at least 6 months of ED who did not receive any treatment, cialis lily patients with normal serum levels of testosterone and luteinizing hormones, and patients who were recommended to use tadalafil for 12 weeks. Patients with a history of hypogonadism, cryptorchidism, varicocele, peripheral neuropathy, uncontrolled diabetes mellitus (hemoglobin a1c >7%), and past and current illicit drug abuse were excluded from the study. The demographic and clinical characteristics of all patients were recorded.
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All patients participating in the study completed the International Index of Erectile Function (IIEF-5) form and underwent penile EMG examination before and after treatment. Patients were divided into two groups as over 50 years old and under 50 years old. A comparative evaluation was made on the effect of age on the outcomes of treatment and penile sensorial EMG. Electrophysiological studies were planned to be performed between 09:00 and 12:00, at a room temperature of 23 to 25 °C, in a quiet room with dim light, and with the relaxed and awake patient in the supine position. A two-channel electroneuromyography device (Nihon-Kohden-Neuropack, model MEB-2200) was used for recording.
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Penile sensorial EMG was examined using Clawson’s method. The penis was placed in the concavity of a specially designed Orthoplast penile traction device and stretched to reach its maximum length by pulling from the tip of the glans. A Cunningham incontinence clamp was placed on the glans, and the penis was maintained in tension by holding from the glans. An electroencephalography paste was used for the placement of active and reference steel electrodes. The active recording electrode was placed as proximal as possible to the root of the penis. They investigated the sensory conduction velocity in the dorsal penile nerve at rest and after injection of prostaglandin E1. They reported that the mean NCV values increased from 32.3+/-6.7 m/s to 47.4+/− 8.2 m/s after the injection of prostaglandin E1. They also reported an increase in NCV in patients with improvement in ED.
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We also showed an increase in NCV after 12 weeks of daily treatment with tadalafil compared with pre-treatment values.
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The increase in these values after treatment was interpreted as canadian pharmace cialis an improvement in penile sensation. As a result, it has been shown that the improvement in IIEF-5 provides an improvement in penile sensation (Figure 1). Currently, PDE-5 inhibitors are used as first-line therapy in patients presenting with ED. Our literature search did not find any studies reporting normal values of penile sensation during a normal erection. In our study, we performed sensorial measurements in patients with ED. The mean NCV in EMG was 35.5 m/s (33.3-41.2) before treatment, and 38.05 m/s (34.5-43.6) after treatment (p<0.001).
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The reference electrode was placed 4 cm above the active electrode. The proximal part of the dorsal penile shaft was stimulated orthodromically with an active electrode and the dorsal glans with a reference electrode (15). Categorical data were presented as number and percentages. Continuous data were evaluated by the Kolmogorov-Smirnov test to verify the normality of the distribution of variables. Normally distributed data were presented as mean + standard deviation, while non-normally distributed data were presented as median and IQR (25-75th).
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An independent simple t-test was used to compare two independent normally distributed data, while the Mann-Whitney U test was used for the comparison of non-normally distributed data. A paired sample t-test was used to compare two independent normally distributed data, while the Wilcoxon test was used for the comparison of non-normally distributed data. Spearman’s Correlation analysis was used to analyze the parameters related to changes in IIEF scores. A p-value of <0.05 was considered statistically significant. Analysis of the dataset was carried out using the IBM Statistical Package for Social Sciences version 23.0 (IBM SPSS Corp.; Armonk, NY, USA).
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One patient discontinued the treatment with the complaint of myalgia, and the study was continued with 28 patients since another patient did not come to the follow-up visit. The mean age of the patients was 53±9 years. The mean duration of ED was 6.8 months. There were 8 (29%) patients with diabetes and 7 (25%) patients with hypertension. The demographic characteristics and comorbidities of the patients are given in Table 1. (20) showed a reduction in proinflammatory cytokines in rats with a 12-week high-dose tadalafil therapy.
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Penile sensorial EMG can provide valuable additional information in the differential diagnosis of ED, particularly allowing the identification of different neurogenic lesion sites (16). (17) injected intracavernosal papaverine in 15 patients with ED and compared the results of penile EMG and biopsy examinations. They demonstrated low -amplitude values in 5 patients with diabetes mellitus. Penile sensorial EMG is a less-invasive, valuable method for patients with ED, whereas penile biopsy examination did not reveal any specific results. Kayigil and Ergen (18) reported lower amplitude values in the EMG of the corpus cavernosum (CC-EMG) in 45%-65% of patients with ED. (21) compared patients with vasculogenic ED and non-vasculogenic ED, both treated with tadalafil.
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They have demonstrated the therapeutic effects of tadalafil on non-vasculogenic ED. (22) showed that long-term tadalafil therapy in diabetic rats partially reduced penile oxidative stress lesions through a local antioxidative stress pathway.
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We showed statistically significant changes in pre-treatment and post-treatment IIEF-5 scores and penile sensorial EMG findings. Pre-treatment IIEF-5 scores of 13±3 were measured as 19±3 after treatment with tadalafil at a daily dose for 12 cialis help with premature ejaculation weeks (p<0.001). This improvement was consistent with the literature. The mean nerve conduction velocities (NCV) in EMG was 35.5 m/sec (33.3-41.2) before treatment, and 38.05 m/sec (34.5-43.6) after treatment (p<0.001). The increase in NCV is the most important finding of penile sensorial EMG showing an increase in penile sensation.
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Thus, the increase in NCV has been interpreted as an improvement in penile sensation. The changes in latency and amplitude values used in the calculation of NCV are given in Table 2. The delta equation (Δ = the amount of change) was created for the IIEF-5 score and penile sensorial EMG findings as post-treatment value minus pre-treatment value. Factors that may be related to this change were evaluated. There was a significant correlation between age and IIEF-5 score and penile sensorial EMG findings.
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There was a significant correlation between the IIEF-5 score and NCV (r=0.663, p<0.001) and Amplitude (r=0.659, p<0.001). As improvement in IIEF-5 increases, so does improvement in NCV and Amplitude (Table 3). The mean amplitude value in penile sensorial EMG was 4.47±1.32 before treatment, whereas it increased to 5.07±1.60 after treatment (p<0.015). Additionally, the mean latency value was 2.14±0.42 before treatment, whereas it increased to 2.32±0.38after treatment (p<0.001). The latency and amplitude parameters in the penile sensorial EMG are used to calculate NCV. Accordingly, they reported that the initiation of long-term once-daily tadalafil therapy immediately after the diagnosis of DM may partially prevent the development of diabetic ED in rats. In our study, we examined patients who received 12 weeks of tadalafil therapy regardless of the cause of ED and performed IIEF scoring and penile sensorial EMG examinations before and after treatment. A significant correlation was observed between the IIEF score and penile sensorial EMG findings.
- Tadalafil Cialis daily provides flexibility in sexual activity timing.
- It is preferred by men who have unpredictable schedules.
- The medication is taken every day, not just before intimacy.
- It helps maintain spontaneous sexual encounters.
- Tadalafil is available in various strengths.
- It is advisable to start at the lowest effective dose.
- Avoid taking more than prescribed to prevent serious side effects.
- Sexual activity remains safe for most men on daily tadalafil.
- Patients should inform their doctor of any adverse reactions.
- The medication can be used in combination with other therapies.
- Safety profiles are well established with daily use.
- Always adhere to medical guidance for optimal results.
A statistically significant improvement was observed in IIEF, NCV, and latency values in both age groups.
- Tadalafil Cialis daily is a prescription medication for ED management.
- It supports improved blood flow for stronger erections.
- The medication is generally taken at the same time each day.
- Ideal for men with frequent erectile concerns.
- It can be used with or without food but consistently.
- Tadalafil’s effects can last up to 36 hours.
- Regular use helps prevent performance stress.
- It’s important to communicate with your doctor about health changes.
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- Tadalafil is not intended for use in women.
- Store medication safely away from children and pets.
(p<0.001, p<0.001, p=0.010 for ≤50 years of age; and p<0.001, p=0.012, p=0.030 for >50 years of age, respectively).
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The dorsal nerve of the penis (DPN) is the terminal sensory branch of the pudendal nerve, which carries sensory data from the glans and shaft of the penis (7,8). Sensory and tactile stimulation of the penis play an important role in erectile and sexual function. Interruption of sensory stimulation causes decreased libido, ejaculatory dysfunction, and loss of impotence (9,10). Erection occurs through three different stimuli: Genital stimulation (contact and reflexogenic), central stimulation (non-contact or psychogenic), or stimulation to the central nervous system (night-time) (11). DPN carries sensory innervation from the penile shaft and glans.
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Therefore, tactile stimulation has an important role in erection (12). Sensory electromyography (EMG) to DPN showed the early occurrence of sensory disturbances in the distal penis (2). Recently, inhibitors of the phosphodiesterase-5 (PDE-5) enzyme have been the most widely used treatment for ED. Tadalafil is an effective and well-tolerated treatment for ED (13). Tadalafil at a dose of 5 mg once daily significantly improves ejaculation and orgasm, sexual intercourse and overall satisfaction, and erectile function (14).
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In this study, we showed the change in penile sensation in men after treatment with ED. Additionally, this topic has not yet been studied in the literature as far as we know. The inclusion of patients using daily therapy for ED regularly was aimed at a clear assessment of outcomes. This research has a prospective and controlled study design. A signed consent form was obtained from all patients who volunteered to participate in the study.
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