Viagra 100mg tablet buy online

The objective of our study was to evaluate the efficacy and safety of the combination of silodosin and vardenafil as a medical expulsive therapy in comparison with each drug alone. One hundred and two male patients with uncomplicated distal ureteric stone 6–10 mm were enrolled in the study.

The patients were randomly divided into 3 equal groups, and each one consists of 34 patients. Group I received silodosin 8 mg once daily, group II vardenafil 5 mg once daily and group III combination of silodosin 8 mg and vardenafil 5 mg once daily. The treatment was given for all the patients until stone expulsion or a maximum of 4 weeks. The primary endpoint was the stone expulsion rate, and the secondary endpoints were time to stone expulsion, number of hospital visits for pain,

amount

Our study showed that the stone expulsion rate was higher in combination = 90.0% than silodosin = 76.7% and vardenafil groups = 60.0% ( P = 0.025), the time to stone expulsion was significantly shorter in combination = 11.23 ± 3.14 than silodosin = 12.50 ± 1.66 and vardenafil groups 14.67 ± 1.24 days ( P. Urolithiasis is considered one of the most common diseases in urological practice.

The prevalence about 1% to 15% with 30 years is the peak age of incidence.

Ureteral stones represent 20% of all urolithiasis, and about 70% of ureteral stones are in the distal ureter [1].

Ureteral stones lead to ureteral spasms which interfere with stone expulsion.

Therefore, trials to reduce these spasms without affecting the normal peristaltic activity have been made to aid stone expulsion.

Medical expulsive therapy (MET) especially using ?-blockers has been used as conservative treatment for patients with ureteral stones [2]. ?1 viagra 100mg tablet buy online receptors are further classified into 3 subtypes of ?-1A, ?-1B and ?-1D, ?-1D > ?-1A > ?-1B in their distribution in the ureter.

?1-adrenoceptors stimulation leads to increase in the ureteric peristalsis frequency and the power of ureteric contractions. Therefore, blockage of these receptors using silodosin reduces ureteral tone and decreases peristaltic force and frequency, leading to lowering of ureteral intra-luminal pressure which increases the stone passage chance [3].

Silodosin is a more selective ?-1A adrenoceptor blocker with a better stone expulsion rate than tamsulosin [4].

Nitrergic fibers have been identified to have a relaxant effect on the distal ureteral smooth musculature [5].

Recently, investigators focused on how blockade of this nitric oxide pathway can be effectively carried out in clinical practice until phosphodiesterase-5 inhibitors (PDE5Is) existed [6, 7]. reported that vardenafil is

more

Previous study had demonstrated that the combination of silodosin and tadalafil is more potent than either drug alone for the treatment of distal ureteric stones [1], but no study has been reported using vardenafil and silodosin in combination for the treatment of distal ureteric stones. Therefore, the efficacy of this combination was evaluated in comparison with the use of each drug alone. From May 2019 to

November

Approval of the ethical committee of our institution was obtained before the start of the study. The inclusion criteria included male patients aged between 18 and 55 years with single radiopaque ureteric stone located below the sacroiliac joint ranging in size between 6 and 10 mm. Exclusion criteria were single kidney, bilateral ureteric stones, severe intractable pain, impairment of renal function, urinary tract infection (UTI), severe hydronephrosis, any urologic anomalies and previous history of ureteral surgery. Also, patients on concomitant treatment with nitrates or calcium channel blockers or with severe hepatic impairment were excluded.

A total of 267 patients with distal ureteric stones were assessed for eligibility to enter the study. One hundred and sixty-five patients were excluded for different reasons (not meeting inclusion criteria 70 patients, refused to participate 54 patients and for other reasons 41 patients) as in Fig. One hundred and two patients who fulfilled the inclusion criteria were enrolled in the study. Informed written consent was obtained from all the patients after explanation of the study procedures and the possible side effects.

The patients were randomly divided into 3 equal groups, and each one consists of 34 patients using closed envelope method.

Group I received silodosin 8 mg once daily, group II vardenafil 5 mg once daily and group III combination of silodosin 8 mg and vardenafil 5 mg once daily.

The treatment was given for all the patients until stone expulsion or a maximum of 4 weeks.

Patients were assessed by history taking, general examination, serum creatinine, urine analysis, urine culture, KUB (kidney, ureter and bladder X-ray) and non-enhanced spiral CT. Patients were advised to take diclofenac 75 mg tablet orally during pain episodes along with the allocated drug. Patients were instructed to filter their urine to detect any passed stones. Our study was planned as a double-blind study, and both the investigators and the participants were unaware of the type of the

treatment

Follow-up was performed weekly by history taking (stone passage, number of hospital visits for pain, total analgesia required and side effects associated with MET) and ultrasonography until spontaneous passage of the stone or stoppage of MET after 4 weeks. The primary endpoint was the stone expulsion rate, and the secondary endpoints were time to stone expulsion, number of hospital visits for pain, amount of analgesic required and side effects associated with MET.

Data was collected, revised, coded and entered into the Statistical Package for Social Science (IBM SPSS) version 23. Normality of data was checked using Kolmogorov–Smirnov test for normality.

The comparison between groups regarding qualitative data was done by Chi-square test .

The comparison between more than two independent groups with quantitative data and parametric distribution was done by one-way ANOVA test. There was no statistically significant difference between the groups for patient’s age, stone site and stone size ( P > 0.05) as in Table 1. The stone expulsion rate was significantly higher in combination than silodosin and pfizer online pharmacy vardenafil groups ( P = 0.025), the time to stone expulsion was significantly shorter in combination than silodosin and vardenafil groups ( P Table 2 Comparison between 3 groups regarding stone expulsion rate, stone expulsion time, number of hospital visits for pain and amount of analgesic required. There was no significant difference among the studied groups regarding headache ( P = 0.749), dizziness ( P = 0.856), orthostatic hypotension ( P = 0.585). However, incidence of retrograde ejaculation was significantly higher in silodosin and combination groups than vardenafil group ( P Table 3 Comparison between the groups according to common complications.

The primary benefit of conservative approach in the

management

Conservative medical treatment is usually indicated in the treatment of uncomplicated distal ureteral stones of 6–10 mm size as these stones have lower chances to pass spontaneously [9]. A great advance in the MET has been achieved with the use of ?-1 adrenoreceptor antagonists to treat these stones by accelerating stone passage through inducing relaxation of distal ureteral smooth muscles [10]. The ?-1 adrenoreceptor antagonists act by inhibiting basal muscular tone, uncoordinated hyperperistaltic wave frequency and ureteral contractions of distal ureter leading to relaxation of ureteral smooth muscles with subsequent ureteral lumen dilatation which results in increase in the rate of stone expulsion [11]. Recently, PDE5 inhibitors were reported to act on the nitric oxide (NO)/cyclic guanosine monophosphate (cGMP) pathway in the smooth muscles, resulting in accumulation of cGMP, resulting in ureteral smooth muscle relaxation. So, PDE5 inhibitors are potentially able to facilitate stone expulsion [8].

Despite having a well-established role in erectile dysfunction (ED) and benign prostatic hyperplasia (BPH), the use of PDE5 inhibitor for MET is in the preliminary stage. In our study, we found that the stone expulsion rate was significantly higher in combination than silodosin and vardenafil groups (90.0%, 76.7% and 60.0%, respectively) ( P = 0.025).

[12] reported that there was a higher expulsion rate 76% in combination therapy group compared to 73% in tadalafil group and 70% in tamsulosin group. There was an increase in expulsion rate in patients with combination therapy, though statistical significance could not be demonstrated.

[6] reported that the stone expulsion rates for tamsulosin, silodosin and tadalafil were 64.4%, 83.3% and 66.7%, respectively, but there was no significant difference between the tamsulosin and tadalafil groups ( P = 0.875). [13] reported that the stone expulsion rate was 58% for placebo group, 80% for tadalafil group and 74% for tamsulosin group.

Tadalafil was superior to placebo in stone expulsion rate ( P = 0.017). The reason for a higher stone expulsion rate in combination group can be explained by the fact the combination of vardenafil and silodosin with different mechanisms of action.

Silodosin acts as ?-1A adrenoceptor blocker, whereas vardenafil acts as PDE5 inhibitor, and thus, the combination of the two drugs may further help in increase in stone expulsion [1].

In this study, we found that the mean stone expulsion time was significantly shorter in combination than silodosin and vardenafil groups (11.23 ± 3.14, 12.50 ± 1.66 and 14.67 ± 1.24 days, respectively, P 0.05).

This can be explained by the young age of the studied population. However, there was a highly significant difference among the studied groups regarding retrograde ejaculation (silodosin and combination = 86.7% vs vardenafil groups = 0.0%) ( P. The combination of silodosin and vardenafil significantly increases the stone expulsion rate and decreases the time to stone expulsion. This combination also significantly decreases the pain episodes without incidence of serious side

effects

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Cardiovascular Effects of the 3 Phosphodiesterase-5 Inhibitors Approved for the Treatment of Erectile Dysfunction.

From the Heart Institute, Good Samaritan Hospital, and the Division of Cardiovascular Medicine, Keck School of Medicine, University of Southern California, Los Angeles.

Within the last year, 2 new phosphodiesterase-5 (PDE5) inhibitors have been approved by the US Food and Drug Administration (FDA) for the treatment of erectile dysfunction (ED).

Currently, sildenafil (Viagra), vardenafil (Levitra), and tadalafil (Cialis) are on the market.

These agents have been shown to be effective in a broad population of men with ED, including patients with vascular disease, coronary artery disease, hypertension, and diabetes. 1–5 Because the enzyme that they inhibit, PDE-5, is found in smooth muscle cells of the systemic arteries and veins throughout the body, these agents have mild vasodilator effects and thus, have the potential to impact the cardiovascular system. 6 This fact is especially important for the patient with ED, because risk factors for ED include many of the same risk factors that are associated with coronary artery disease: lipid abnormalities, hypertension, smoking, diabetes, and lack of physical exercise. 7,8 Because erection is a vascular event, endothelial dysfunction may inhibit it.

9 Endothelial dysfunction, an early component of atherosclerosis, is rarely confined to the arteries supplying blood to the penis but more likely occurs throughout the vascular bed.

Kaiser et al 10 studied 30 men with ED and observed that brachial artery flow–mediated vasodilation and nitroglycerin-mediated vasodilation were reduced in these patients compared with men without ED. Thus, ED may be an early marker of vascular disease.

10 Patients with frank coronary artery disease, known to be associated with endothelial dysfunction, and frank atherosclerosis often have ED, as we recently observed in 1 study, in which three fourths of the men with chronic stable angina also reported some degree of ED. 11 Hence, the vasodilator effect of these PDE5 agents should be taken into consideration for the cardiac patient, both as a possible concern in some cases or a possible beneficial effect in others. The purpose of the present review is to describe the cardiovascular effects of the 3 available PDE5 inhibitors, the issue of nitrate interaction, differences and similarities in labeling regarding concomitant use of nitrates and ?-blockers, their effect on the QT interval, their safety in regard to cardiac events, and the concept that these agents may eventually play a role in therapies for various cardiac conditions, including pulmonary hypertension and congestive heart failure.

Effect of PDE5 Inhibitors on Blood Pressure and Heart Rate.

Sildenafil was approved as an effective agent for treating ED in 1998, and its cardiovascular effects have been studied in great depth.

In 1 study of 8 volunteers, 12 80 mg of intravenous sildenafil reduced systolic blood pressure from 131±12 mm Hg with placebo to 122±13 mm Hg ( P 12 gave 8 healthy male subjects 100, 150, and 200 mg of oral sildenafil.

The mean maximum reduction in supine systolic/diastolic blood pressure was 10/7 mm Hg at 3 hours after dosing, with no difference in the 200-mg versus the 100-mg dose.

In most subjects, blood pressure returned to baseline within 6 hours.

The authors did not observe a significant orthostatic drop in blood pressure or increase in heart rate in the female viagra cheap standing position.

Sildenafil, as expected, reduced vascular resistance.

In patients with stable ischemic heart disease 40 mg of intravenous sildenafil reduced systolic arterial pressure from 150±12 to 141±16 mm Hg (mean±SD) and diastolic blood pressure from 74±8 to 66±10 mm Hg but had no effect on heart rate. Cardiac output was 5.6±0.9 L/min at baseline and 5.2±1.1 L/min after intravenous sildenafil. Pulmonary artery pressure fell from 16.7±4.0 to 12.1±3.9 mm Hg.

Subsequent studies verified that sildenafil results in small reductions in systolic and diastolic blood pressure, with little or no effect on heart

rate

13–15 In addition, sildenafil was shown in numerous studies of pulmonary hypertension to reduce pulmonary vascular resistance and pulmonary artery pressure (PDE5 is rich within the pulmonary vasculature). Vardenafil was the second PDE5 inhibitor to come to market in the United States, and it was approved by the FDA in 2003.

It has many similarities to sildenafil; in fact, its molecular structure is very similar (Figure), and they share a half-life of ?4 hours.

In healthy volunteers, vardenafil caused a transient reduction in supine blood pressure with a mean maximum decrease of 7 mm Hg systolic and 8 mm Hg diastolic. Maximum reduction occurred between 1 and 4 hours after dosing.

19 A 20-mg dose of vardenafil resulted in a mean maximum increase in heart rate of 4 beats/min.

Molecular structures of sildenafil, vardenafil, and tadalafil. Note similarity in structure between sildenafil and vardenafil. Reprinted with permission from Rosen RC, Kostis JB. Overview of phosphodiesterase 5 inhibition in erectile dysfunction. Tadalafil was the third PDE5 inhibitor to come to market in the United States and was approved by the FDA at the end of 2003.

Its chemical structure differs substantially from that of sildenafil and vardenafil, and it has a unique, long half-life of 17.5 hours.

In healthy subjects, a single oral dose of 10 or 20 mg of tadalafil did not drop systolic blood pressure significantly compared with placebo.

The decrease in systolic blood pressure with 20 mg tadalafil versus placebo was ?0.2 mm Hg (95% confidence interval [CI], ?7.1 to 6.6) in the standing position. 20,21 The mean decrease in diastolic blood pressure compared with placebo was ?4.6 mm Hg (95% CI, ?7.9 to ?1.2) in the standing position. Diastolic blood pressure was generally lower for 12 hours after administration of the drug, but the decrease in pressure remained small.

Changes were even less marked in the supine position. Standing and supine heart rates were not significantly different from those with placebo.

In patients with coronary artery disease, who had higher systolic blood pressures at baseline than did healthy volunteers, 10 mg tadalafil reduced standing systolic blood pressure from 134 to 127 mm Hg (?7 mm Hg) and diastolic blood pressure from 78 to 74 mm Hg (?4 mm Hg) at time to maximum plasma concentration (T max ; 2 hours) after dosing.

Hence, all 3 of the PDE5 inhibitors are mild vasodilators and may cause small drops in arterial pressure. However, the degree of drop in blood pressure is usually small.

Although this is rarely a concern in healthy individuals, in cardiovascular patients with low blood pressure or hypotension at baseline, this could be a concern, as described in recent guidelines. 22 This vasodilating property would also be a concern for patients with left ventricular outflow obstruction or aortic stenosis.

22,23 This property also

becomes

When NO donors are given at the same time as PDE5 inhibitors, there is both an increase in the production of cyclic viagra 100mg tablet buy online GMP (due to the NO donor) and an inhibition of its breakdown (due to the PDE5 inhibitor) that can lead to a build-up of cyclic GMP with pronounced vasodilation and, in some patients, frank hypotension. Organic nitrates are contraindicated with all 3 PDE5 inhibitors on the market.

19–21,25,26 Details of interaction studies are presented in the online supplement to this article.

If a patient with coronary artery disease takes a PDE5 inhibitor and then develops angina pectoris, when is it safe to administer nitroglycerin? A consensus statement from the American College of Cardiology/American Heart Association suggested that for sildenafil, 6 half-lives, or 24 hours (4 hours ? 6), pass between sildenafil intake and the administration of a nitrate.

22 This time frame was chosen to allow full washout of drug from the tissues.

In a previous analysis, 20 at 24 hours after sildenafil, there was no interaction with sublingual nitroglycerin.

In a recent preliminary study of healthy individuals, the sildenafil-nitroglycerin interaction appeared to be gone as early as 4 hours.

Although a detailed time-course study of the interaction between vardenafil and nitrates is not available, 1 unpublished study 19 did suggest a lack of interaction at 24 hours, consistent with a 4-hour half-life.

A nitrate-tadalafil interaction study was recently reported. 28 In a population of patients who were healthy or had controlled hypertension or diabetes, 20 mg tadalafil or placebo was given daily for 7 days. On the seventh day, sublingual nitroglycerin was administered at 2, 4, 8, 24, 48, 72, or 96 hours. There was evidence that tadalafil augmented the nitrate-induced decrease in blood pressure within the first 24 hours of its administration. At and beyond 48 hours, the interaction was not detectable, as assessed by mean maximal falls in blood pressure or outlier criteria. Thus, the manufacturer suggests that if a patient has taken tadalafil and develops chest pain and it is deemed medically necessary that nitrates be given, at least 48 hours should elapse after the last dose of tadalafil before nitrates are given. Even then, nitrates should be given only under close medical supervision and appropriate hemodynamic monitoring.

What should a patient do if he/she develops chest pain after having taken a PDE5 inhibitor? The patient should call for emergency assistance for hospital transport 29 and apprise the emergency medical technicians and emergency physicians regarding use of the PDE5 inhibitor.

The American College of Cardiology/American Heart Association Consensus document 22 reminds physicians that other antianginal agents can be considered in such situations.

?-Blockers,

calcium

Interaction With Common Antihypertensive Agents Other Than ?-Blockers.

Several studies investigated the interactions of sildenafil, vardenafil, and tadalafil on blood pressure in patients already taking usual antihypertensive medicines, such as calcium channel blockers, diuretics, ?-blockers, angiotensin-converting-enzyme inhibitors, and angiotensin receptor blockers. In general, these studies suggested that when a PDE5 inhibitor was administered to patients already taking antihypertensive medications, small additive drops in blood pressure occurred that were roughly equivalent to or less than the drops in pressure that occurred when the PDE5 inhibitors were taken without concomitant antihypertensive agents. Webb buy sildenafil at walgreens et al 25 studied men who were already receiving amlodipine for the treatment of hypertension for at least 1 month.

These authors showed that 100 mg sildenafil given 2 hours after a morning dose of 5 or 10 mg amlodipine resulted in a mean maximal change from baseline blood pressure of ?8 mm Hg supine systolic and ?7 mm Hg supine diastolic compared with men who received placebo plus amlodipine. The differences in standing systolic and diastolic blood pressures were ?10 and ?8 mm Hg, respectively.

Even smaller additional reductions in blood pressure were reported when the PDE5 inhibitor sildenafil was administered to patients already taking ?-blockers, diuretics, or angiotensin-converting-enzyme inhibitors.

30 There was no increase in adverse events in patients treated with sildenafil who received antihypertensive medicines, even multiple antihypertensive medicines.

30–32 No increase in syncope or postural hypotension was reported when sildenafil was given to patients already taking these common antihypertensive drugs.

Furthermore, the most common side effects of sildenafil (headache, flushing, dyspepsia, visual disturbance, rhinitis) were not worsened in patients on concomitant antihypertensive medicines, even if the patients were taking 2 or more antihypertensive medicines. 31 The efficacy of sildenafil to improve ED remained high (?72%) in hypertensive patients taking antihypertensive agents.

Vardenafil was associated with a small or no fall in blood pressure when administered to patients taking their usual antihypertensive medicines. 33,34 Vardenafil 20 mg produced an additional fall in mean systolic/diastolic blood pressure of 6/5 mm Hg versus placebo when it was concomitantly administered with slow-release nifedipine (30 or 60 mg) in patients whose blood pressure had been controlled with this calcium channel blocker.

Kloner et al 36 reported a series of studies in which 10 or 20 mg tadalafil was administered to patients with hypertension taking antihypertensive medications or to healthy individuals who received an antihypertensive medicine.

In healthy individuals receiving 5 mg amlodipine daily for at least 14 days, 20 mg tadalafil had no significant additional effect with a mean change in systolic/diastolic blood pressure of ?1/1 mm Hg compared with placebo.