All of the study has a reasonable assessment for the quality of each trail. Six RCTs with 1,596 participants (Figure 2) were identified. Based on our analysis, the random-effects estimate of MD=3.09, and 95% CI: 0.92–5.26 (P=0.005). The result shows that long-term tadalafil 5mg once-daily showed greater increases in the IIEF domain compared with control group. Figure 3 shows the results of the change in the IIEF-IS. The random-effects estimate of the MD=1.42, 95% CI: 0.04–2.80 (P=0.04). The result shows that experimental group showed greater increases in the IIEF-IS domain compared with control group. Three RCTs met the inclusion criteria (Figure 3).
| Condition | Recommendation | Notes |
|---|---|---|
| Nitrate use | Do not use concurrently | Risk of severe hypotension |
| Severe liver impairment | Consult doctor before use | Adjusted dosing may be necessary |
| Heart conditions | Caution; consult healthcare provider | Especially for unstable angina |
| Retinitis pigmentosa | Use with caution | Eye health considerations |
| Hypotension (<90/50 mmHg) | Avoid use | Blood pressure management |
The fixed-effects estimate of the MD=0.96, 95% CI: 0.19–1.72 (P=0.01). The result shows that experimental group showed greater increases in the IIEF-OS domain compared with control group.
Three studies failed to report the data. Three RCTs, representing 979 participants were identified (Figure 3).
Tadalafil can be absorbed rapidly and possesses a longer half-life of 17.5 hours than other PDE5 inhibitor (9,10). The prolonged half-life of tadalafil and effective steady-state serum concentration makes it ideally suited for daily dosing (11,12). Although PDE5 inhibitors are easy to use, men should take these oral agents when they wish to engage in sexual activity, and therefore, they should remain temporally linked to treatment. For some patients and their partners, planning sexual activity around drug intake is troublesome. The concept of daily administration of PDE5 inhibitors was also established to provide an alternative treatment option that is closer to a natural sexual life.
Several clinical studies have evaluated the safety and efficacy of tadalafil dosed once daily in patients with ED. Compared with taking on demand, it can eliminate the embarrassment of taking medication before intercourse, increase male confidence, avoid psychological barriers between husband and wife, especially for patients with severe ED. In patients with ED, tadalafil 2.5 and 5 mg administered once daily for 12 weeks were well tolerated and significantly improved erectile function compared with placebo (13). Although tadalafil has been shown to be safe and well tolerated when taken on demand for up to 2 years (14), long-term safety and efficacy data for tadalafil dosed once daily has rarely been reported. This analysis was to assess the efficacy and safety of taking tadalafil 5 mg once-daily for at least 6 months in the treatment of ED, which may resolve some of the current debate over use of the drug. Heterogeneity test indicated P=0.69, the random effect model was selected for statistical analysis. The forest plots showed the SD=0.90 and 95% CI: 0.85–0.95 (P<0.00001). The result shows that experimental group showed greater improvement in the IIEF-5 Q3 compared with control group. Three RCTs including 979 participants were identified (Figure 3).
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No heterogeneity was found among the trials in our analysis (Figure 3), the fixed-effects model was chosen for the statistical analysis.
The pooled estimate of MD was 0.66, and the 95% CI was 0.58–0.74 (P<0.00001). Our meta-analysis suggests that experimental group showed greater improvement in the IIEF-5 Q4 compared with control group. Two RCTs including 471 participants were identified (Figure 4). Based on our analysis, we concluded that (I) the pooled estimate of odds ratio (OR) of the SEP2 was 3.53, and the 95% CI was 1.01–12.40 (P=0.05); (II) the OR of the SEP3 was 2.93, and the 95% CI was 1.14–7.53 (P=0.03); (III) the OR of the SEP4 was 2.87, and the 95% CI was 1.80–4.58 (P<0.00001); (IV) the OR of the SEP5 was 2.98, and 95% CI was 1.85-4.81 (P<0.00001).
We present the following article in accordance with the PRISMA reporting checklist (available at With Embase (2003 to Jun 2019), MEDLINE (2003 to Jun 2019), and Cochrane Central Register of Controlled Trials, we undertook a retrieval to examine published randomized controlled trials (RCTs), which investigated long-term tadalafil (5 mg once-daily) for ED at least 6 months of treatment. The searching terms were following: “ED”, “tadalafil”, “once-daily”, “long-term” and “RCT”. Additionally, we screened the retrieved references for each article. The met criteria of RCTs: (I) tadalafil (5 mg once-daily) in treating ED; (II) accurate data could be analyzed; (III) the study can be accessed. If the same study is published in a different journal, we will include the latest one.
However, if the same group of researchers conducts multiple different trials on a group of subjects, we will include each study. A flow chart was used to show the selection process of the study (Figure 1). We used cialis pricing 20mg the Jadad scale to determine the quality of the retrieved RCTs (15). The methodological quality of each study was assessed based on how patients were assigned to the various departments of the study, the concealment of the distribution procedure, blinding, and data loss due to wear and tear. Then, according to the plan published in the Cochrane Handbook for Systematic Reviews of Interventions v.5.1.0 (16), the studies were then classified qualitatively. Our meta-analysis suggests that the experimental discount cialis online no prescription group showed greater improvement in the SEP 3, SEP 4 and SEP 5 in comparison with placebo. Six RCTs with 1,596 participants reported the TEAEs data (Figure 5).
Based on the above inclusion criteria, after reading the titles and abstracts of these articles, 74 studies cialis soft online were deleted. Finally, six articles (18-23) were included in the study to access the long-term (≥6 months) effect of tadalafil (5 mg once-daily) in treating male with ED (Figure 1). Table 1 showed the characteristics of each trail. All six trials were randomized controlled studies, both of which addressed randomized and double-blind processes. All studies included adequate patients (Table 2). We adopted the fixed-effects model (The pooled OR 1.25, 95% CI: 0.99–1.58, P=0.06).
| Study | Percentage of Effective Cases | Notes |
|---|---|---|
| Clinical Trial A | 70% | Effectiveness after 4 weeks |
| Real-World User Reports | 65-75% | Variability depending on individual |
| Meta-analysis (2022) | 72% | Overall success rate |
| Patient Satisfaction Survey | 80% | Satisfaction with duration |
| Short-term Use (2 weeks) | 60% | Initial response rate |
The results showed no difference in the incidence of TEARs between the two groups. Six RCTs with 1,596 participants were included. The random-effects estimate of the MD=1.29, 95% CI: 0.79–2.09 (P=0.31). In terms of the incidence of discontinuation due to AEs, the result showed that tadalafil and placebo are similar.
Six RCTs including 1,596 participants were involved in the analysis for headache.
| Parameter | Value | Description |
|---|---|---|
| Absorption Time | About 2 hours | Time to reach peak plasma levels |
| Half-life | 17.5 hours | Duration of drug presence in blood |
| Bioavailability | 40% | Percentage absorbed into circulation |
| Metabolism | Liver (CYP3A4 enzyme) | Primary pathway |
| Excretion | Feces and urine | Elimination routes |
The pooled estimate of the OR was 1.46, and the 95% CI was 0.85 to 2.51 (P=0.17). Three RCTs included data on back pain (OR 2.24; 95% CI: 1.09–4.62; P=0.03), and 4 RCTs included data on dyspepsia (OR 1.82; 95% CI: 1.01–3.26; P=0.05).
$2/pill with our mail order partner. Prices at Walgreens/CVS can be $18/pill. To choose the best ED medicine for you, check out: Of All the Erectile Dysfunction Drugs, Which One’s the Best? Answer confidential assessmentYour responses help us understand your unique situation Your responses help us understand your unique situation A doctor or nurse practitioner will message you within 1 dayPersonalized discussion about treatment options FREE fast delivery to your door2-3 business days and then monthly delivery for 11 refills - cancel anytime 2-3 business days and then monthly delivery for 11 refills - cancel anytime Erectile dysfunction (ED) is defined as the inability to achieve and maintain an erection sufficient for satisfactory sexual intercourse (1). Although ED is not life-threatening, it is closely related to the patient’s quality of life, sexual relationship and family stability (2).
It is also an early warning sign of many physical diseases, such as stroke, tumors, Parkinson’s disease, and spinal cord disease, etc. Estimates suggest that ED affects approximately 150 million men worldwide, and the rates of ED are expected to double by the year 2025 (4,5). In view of the current trend, the research and treatment of ED is very important and meaningful. A number of therapeutic options are available to treat men with ED. Of these, oral phosphodiesterase type 5 (PDE5) inhibitors are recommended as a first line of therapy (6-8). These results indicate that there is no significant difference between the two groups in terms of headache, back pain and indigestion (Figure 5).
Each article is evaluated and assigned according to three quality classification criteria: (I) meting all quality criteria: low risk of bias; (II) partially met or ambiguous: moderate risk of bias; or (III) rarely met or not involved: high risk of bias. All authors participated in the RCTs quality assessment and resolved the differences through discussion. This systematic review and meta-analysis was not required ethical approval. All six articles included were obtained from open databases. The following details from individual studies: (I) regimen patients received; (II) design of study and size of sample; (III) name of the RCT; (IV) the study of country; (V) total international index of erectile function (IIEF) domain, international index of erectile function questionnaire intercourse satisfaction (IIEF-IS) domain, IIEF overall satisfaction (IIEF-OS) domain, question 3 (IIEF-5 Q3) and question 4 (IIEF-5 Q4), IIEF sexual encounter profile (SEP) question 2 (SEP2), question 3 (SEP3), question 4 (SEP4), question 5 (SEP5), treatment-emergent adverse events (AEs), headache, back pain, dyspepsia and discontinuations due to AEs.
It should be noted that both IIEF-5 and IIEF-EF belong to the IIEF category, so we choose the IIEF domain as an indicator. The meta-analysis of comparable data was carried out using RevMan v.5.1.0 (Cochrane Collaboration, Oxford, UK). We used a fixed-effect and random-effects model to estimate the mean difference (MD) of continuous data and the odds ratio (OR) of the categorical results, with a corresponding 95% confidence interval (CI) (17). When the analysis results showed that the P value was >0.05, the study was considered to be homogeneous, we would use fixed-effect model. Otherwise, the random effect model was chosen to analyze the data. ED is a common disease that affects men worldwide and is associated with increased age, underlying cardiovascular, neurological, psychological, and even some urology surgery (24).