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LEVITRA 20 mg caused an additional time-related reduction in blood pressure and increase in heart rate in association with NTG administration.
The blood pressure effects were observed when LEVITRA 20 mg was dosed 1 or 4 hours before NTG and the heart rate effects were observed when 20 mg was dosed 1, 4, or 8 hours before NTG. Additional blood pressure and heart rate changes were not detected when LEVITRA 20 mg was dosed 24 hours before NTG.
(See Figure 1.) Figure 1: Placebo-subtracted point estimates (with 90% CI) of mean maximal blood pressure and heart rate effects of pre-dosing with vardenafil 20 mg at 24, 8, 4, and 1 hour before 0.4 mg NTG sublingually. Because the disease state of patients requiring nitrate therapy is anticipated to increase the likelihood of hypotension, the use of vardenafil by patients on nitrate therapy or on nitric oxide donors is contraindicated [see CONTRAINDICATIONS ]. Blood Pressure Effects In Patients On Stable Alpha-Blocker Treatment.
Three clinical pharmacology studies were conducted in patients with benign prostatic hyperplasia (BPH) on stable-dose alpha-blocker treatment, consisting of alfuzosin, tamsulosin or terazosin. This study was designed to evaluate the effect of 5 mg vardenafil compared suhagra 25 mg price to placebo when administered to BPH patients on chronic alpha-blocker therapy in two separate cohorts: tamsulosin 0.4 mg daily (cohort 1, n=21) and terazosin 5 or 10 mg daily (cohort 2, n=21). The design was a randomized, double blind, cross-over study with four treatments: vardenafil 5 mg or placebo administered simultaneously with the alpha-blocker and vardenafil 5 mg or placebo administered 6 hours after the alpha-blocker. Blood pressure and pulse were evaluated over the 6-hour interval after vardenafil dosing. One patient after simultaneous treatment with 5 mg vardenafil and 10 mg terazosin exhibited symptomatic hypotension with standing blood pressure of 80/60 mmHg occurring one hour cenforce 100mg price cenforce 100mg price after administration and subsequent mild dizziness and moderate lightheadedness lasting for 6 hours.
For vardenafil and
placebo, five and two patients, respectively, experienced a decrease in standing systolic blood pressure (SBP) of >30 mmHg following simultaneous administration of terazosin.
Hypotension was not observed when vardenafil 5 mg and terazosin were administered 6 hours apart.
Following simultaneous administration of vardenafil 5 mg and tamsulosin, two patients had a standing SBP of 30 mmHg was observed in two patients on tamsulosin receiving simultaneous vardenafil and in one patient receiving simultaneous placebo treatment.
When tamsulosin and vardenafil 5 mg were separated by 6 hours, two patients had a standing SBP 30 mmHg. There were no severe adverse events related to hypotension reported during the study.
Table 2: Mean (95% C.I.) maximal change from baseline in systolic blood pressure (mmHg) following vardenafil 5 mg in BPH patients on stable alpha-blocker therapy (Study 1) Alpha-Blocker Simultaneous dosing of Vardenafil 5 mg and Alpha-Blocker, Placebo-Subtracted Dosing of Vardenafil 5 mg and Alpha-Blocker Separated by 6 Hours, Placebo-Subtracted Terazosin Standing SBP -3 (-6.7, 0.1) -4 (-7.4, -0.5) 5 or 10 mg daily Supine SBP -4 (-6.7, -0.5) -4 (-7.1, -0.7) Tamsulosin Standing SBP -6 (-9.9, -2.1) -4 (-8.3, -0.5) 0.4 mg daily Supine SBP -4 (-7, -0.8) -5 (-7.9, -1.7) Blood pressure effects (standing SBP) in normotensive men on stable dose of tamsulosin 0.4 mg following simultaneous administration of vardenafil 5 mg or placebo, or following administration of vardenafil 5 mg or placebo separated by 6 hours are shown in Figure 2.
Blood pressure effects (standing SBP) in normotensive men on stable dose terazosin (5 or 10 mg) following simultaneous administration of vardenafil 5 mg or placebo, or following administration of vardenafil 5 mg or placebo separated by 6 hours, are shown in Figure 3. Figure 2: Mean change from baseline in standing systolic blood pressure (mmHg) over 6 hour interval following simultaneous or 6 hr separation administration of vardenafil 5 mg or placebo with stable dose tamsulosin 0.4 mg in normotensive BPH patients (Study 1) Figure 3: Mean change from baseline in standing systolic blood pressure (mmHg) over 6 hour interval following simultaneous or 6 hr separation administration of vardenafil 5 mg or placebo
with stable dose terazosin (5 or 10 mg) in normotensive BPH patients (Study 1) This study was designed to evaluate the effect of 10 mg vardenafil (stage 1) and 20 mg vardenafil (stage 2) compared to placebo, when administered to a single cohort of BPH patients (n=23) on stable therapy with tamsulosin 0.4 mg or 0.8 mg daily for at least four weeks.
The design was a randomized, double blind, two-period cross-over study.
Vardenafil or placebo was given simultaneously with tamsulosin.
Blood pressure and pulse were evaluated over the 6hour interval after vardenafil dosing.
One patient experienced a decrease from baseline in standing SBP of >30 mmHg following vardenafil 10 mg.
There were no other instances of outlier blood pressure values (standing SBP 30 mmHg).
Three patients reported dizziness following vardenafil 20 mg.
Table 3: Mean (95% C.I.) maximal change from baseline in systolic blood pressure (mmHg) following vardenafil 10 and 20 mg in BPH patients on stable alpha-blocker therapy with tamsulosin 0.4 or 0.8 mg daily (Study 2) Vardenafil 10 mg Placebo-subtracted Vardenafil 20 mg Placebo-subtracted Standing SBP -4 (-6.8, -0.3) -4 (-6.8, -1.4) Supine SBP -5 (-8.2, -0.8) -4 (-6.3, -1.8) Blood pressure effects (standing SBP) in normotensive men on stable dose of tamsulosin 0.4 mg following simultaneous administration of vardenafil 10 mg, vardenafil 20 mg or placebo are shown in Figure 4. Figure 4: Mean change from baseline in standing systolic blood pressure (mmHg) over 6 hour interval following simultaneous administration of vardenafil 10 mg (Stage 1), vardenafil 20 mg (Stage 2), or placebo with stable dose tamsulosin 0.4 mg in normotensive BPH patients (Study 2) This study was designed to evaluate the effect of single doses of 5 mg vardenafil (stage 1) and 10 mg vardenafil (stage 2) compared to placebo, when administered to a single cohort of BPH patients (n=24) on stable therapy with alfuzosin 10 mg daily for at least four weeks. The design was a randomized, double blind, 3period cross-over study.
Vardenafil or placebo was administered 4 hours after the administration of alfuzosin. Blood pressure and pulse were evaluated over a 10-hour interval
after dosing of vardenafil or placebo. Table 4: Mean (95% C.I.) maximal change from baseline in systolic blood pressure (mmHg) following vardenafil 5 and 10 mg in BPH patients on stable alpha-blocker therapy with alfuzosin 10 mg daily (Study 3) Vardenafil 5 mg Placebo-subtracted Vardenafil 10 mg Placebo-subtracted Standing SBP -2 (-5.8, 1.2) -5 (-8.8, -1.6) Supine SBP -1 (-4.1, 2.1) -6 (-9.4, -2.8) One patient experienced decreases from baseline in standing systolic blood pressure >30 mm Hg after administration of vardenafil 5 mg film-coated tablet and vardenafil 10 mg film-coated tablet. Blood Pressure Effects In Normotensive Men After Forced Titration With Alpha-Blockers. Two randomized, double blind, placebo-controlled clinical pharmacology studies with healthy normotensive volunteers (age range, 45-74 years) were performed after forced titration of the alpha-blocker terazosin to cenforce 100mg price 10 mg daily over 14 days (n=29), and after initiation of tamsulosin 0.4 mg daily for five days (n=24).
There were no severe adverse events related to hypotension in either study. Symptoms of hypotension were a cause for withdrawal in 2 subjects receiving terazosin and in 4 subjects receiving tamsulosin.
Instances of outlier blood pressure values (defined as standing SBP 30 mmHg) were observed in 9/24 subjects receiving tamsulosin and 19/29 receiving terazosin. The incidence of subjects with standing SBP Alpha-Blocker Dosing of Vardenafil and Alpha-Blocker Separated by 6 Hours Simultaneous dosing of Vardenafil and Alpha-Blocker Vardenafil 10 mg Placebo-Subtracted Vardenafil 20 mg Placebo-Subtracted Vardenafil 10 mg Placebo-Subtracted Vardenafil 20 mg Placebo-Subtracted Terazosin 10 mg daily Standing SBP -7 (-10, -3) -11 (-14, -7) -23 (-31, 16) a -14 (-33, 11) a Supine SBP -5 (-8, -2) -7 (-11, -4) -7 (-25, 19) a -7 (-31, 22) a Tamsulosin 0.4 mg daily Standing SBP -4 (-8, -1) -8 (-11, -4) -8 (-14, -2) -8 (-14, -1) Supine SBP -4 (-8, 0) -7 (-11, -3) -5 (-9, -2) -3 (-7, 0) a) Due to the sample size, confidence intervals may not be an accurate measure for these data. These values represent the range for the difference.
Figure 6: Mean change from baseline in standing systolic blood pressure (mmHg) over 6 hour interval following simultaneous or 6 hr separation administration of vardenafil 10 mg, vardenafil 20 mg or placebo with terazosin (10 mg) in healthy volunteers.
Figure 7: Mean change from baseline in standing systolic blood pressure (mmHg) over 6 hour interval following simultaneous or 6 hr separation administration of vardenafil 10 mg, vardenafil 20 mg or placebo with tamsulosin.
The effect of 10 mg and 80 mg vardenafil on QT interval was evaluated in a single-dose, double-blind, randomized, placebo-and active-controlled (moxifloxacin 400 mg) crossover study in 59 healthy males (81% White, 12% Black, 7% Hispanic) aged 45-60 years.
The QT interval was measured at one hour post dose because this time point approximates the average time of peak vardenafil concentration.
The 80 mg dose of LEVITRA (four times the highest recommended dose) was chosen because this dose yields plasma concentrations covering those observed upon co-administration of a
low-dose of LEVITRA (5 mg) and 600 mg BID of ritonavir. Of the CYP3A4 inhibitors that have been studied, ritonavir causes the most significant drug-drug interaction with vardenafil.
Table 6 summarizes the effect on mean uncorrected QT and mean corrected QT interval (QT c ) with different methods of correction (Fridericia and a linear individual correction method) at one hour post-dose. No single correction method is known to be more valid than the other. In this study, the mean increase in heart rate associated with a 10 mg dose of LEVITRA compared to placebo was 5 beats/minute and with an 80 mg dose of LEVITRA the mean increase was 6 beats/minute.
Mean QT and QT c changes in msec (90% CI) from baseline relative to placebo at 1 hour post-dose with different methodologies to correct for the effect of heart rate. Drug/Dose QT Uncorrected (msec) Fridericia QT Correction (msec) Individual QT Correction (msec) Vardenafil 10 mg -2 (-4, 0) 8 (6, 9) 4 (3, 6) Vardenafil 80 mg -2 (-4, 0) 10 (8, 11) 6 (4, 7) Moxifloxacin a 400 mg 3 (1, 5) 8 (6, 9) 7 (5, 8) a) Active control (drug known to prolong QT) Therapeutic and supratherapeutic doses of vardenafil and the active control moxifloxacin produced similar increases in QT c interval. This study, however, was not designed to make direct statistical comparisons between the drug or the dose levels.
The clinical impact of these QT c changes is unknown [see WARNINGS AND PRECAUTIONS ]. In a separate postmarketing study of 44 healthy volunteers, single doses of 10 mg LEVITRA resulted in a placebo- subtracted mean change from baseline of QT c F (Fridericia correction) of 5 msec (90% CI: 2,8). Single doses of gatifloxacin 400mg resulted in a placebo-subtracted mean change from baseline QTcF of 4 msec (90% CI: 1,7). When LEVITRA 10mg and gatifloxacin 400 mg were co-administered, the mean QTcF change from baseline was additive when compared to either drug alone and produced a mean QTcF change of 9 msec from baseline (90% CI: 6,11). The clinical impact of these QT changes is unknown [see WARNINGS AND PRECAUTIONS ].
Effects On Exercise Treadmill Test In Patients With Coronary Artery Disease (CAD) In two independent trials that assessed 10 mg (n=41) and 20 mg (n=39) vardenafil, respectively, vardenafil did not alter the total treadmill exercise time compared to placebo.
The patient population included
men aged 40-80 years with stable exercise-induced angina documented by at least one of the following: 1) prior history of myocardial infarction (MI), coronary artery bypass graft (CABG), percutaneous transluminal coronary angioplasty (PTCA), or stenting (not within 6 months); 2) positive coronary angiogram showing at least 60% narrowing of the diameter of at least one major coronary artery; or 3) a positive stress echocardiogram or stress nuclear perfusion study. Results of these studies showed that LEVITRA did not alter the total treadmill
exercise time compared to placebo (10 mg LEVITRA vs. placebo: 433±109 and 426±105 seconds, respectively; 20 mg LEVITRA vs.
placebo: 414±114 and 411±124 seconds, respectively). The total time to angina was not altered by LEVITRA when compared to placebo (10 mg LEVITRA vs.
placebo: 291±123 and 292±110 seconds; 20 mg LEVITRA vs.
placebo: 354±137 and 347±143 seconds, respectively). The total time to 1 mm or greater ST-segment depression was similar to placebo in both the 10 mg
and the 20 mg LEVITRA groups (10 mg LEVITRA vs. placebo: 380±108 and 334±108 seconds; 20 mg LEVITRA vs.
placebo: 364±101 and 366±105 seconds, respectively).
Single oral doses of phosphodiesterase inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green) using the Farnsworth-Munsell 100-hue test and reductions in electroretinogram (ERG) b-wave amplitudes, with peak effects near the time of peak plasma levels. These findings are consistent with the inhibition of PDE6 in rods and cones, which is involved in phototransduction in the retina.
The findings were most evident one hour after administration, diminishing but still present 6 hours after administration.
In a single dose study in 25 normal males, LEVITRA 40 mg, twice the maximum daily recommended dose, did not alter visual acuity, intraocular pressure, fundoscopic and slit lamp findings. In another double-blind, placebo controlled clinical trial, at least 15 doses of 20 mg vardenafil were administered over 8 weeks versus placebo to 52 males. Thirty-two (32) males (62%) of the patients completed the trial.
Retinal function was measured by ERG and FM-100 test 2, 6 and 24 hours after dosing. The trial was designed to detect changes in retinal function that might occur in more than 10% of patients. Vardenafil did not produce clinically significant ERG or FM-100 effects in healthy men compared to placebo.
Two patients on vardenafil in the trial reported episodes of transient cyanopsia (objects appear blue). There was no effect on sperm motility or morphology after single 20 mg oral doses of vardenafil in healthy volunteers. The pharmacokinetics of vardenafil are approximately dose proportional over the recommended dose
range.. Mean vardenafil plasma concentrations measured after the administration of a single oral dose of 20 mg to healthy male volunteers are depicted in Figure 8. Figure 8: Plasma Vardenafil Concentration (Mean ± SD) Curve for a Single 20 mg LEVITRA Dose.
Vardenafil is rapidly absorbed with absolute bioavailability of approximately 15%.
Maximum observed plasma concentrations after a single 20 mg dose in healthy volunteers are usually reached between 30 minutes and 2 hours (median 60 minutes) after oral dosing in the fasted state. Two food-effect studies were conducted which showed that high-fat meals caused a reduction in Cmax by 18%-50%.
The mean steady-state volume of distribution (Vss) for vardenafil is 208 L, indicating extensive tissue distribution. Vardenafil and its major circulating metabolite, M1, are highly bound to plasma proteins (about 95% for parent drug and M1). This protein binding is reversible and independent of total drug concentrations. Following a single oral dose of 20 mg vardenafil in healthy volunteers, cenforce 100mg price a mean of 0.00018% of the administered dose was obtained in semen 1.5 hours after dosing. Vardenafil is metabolized predominantly by the hepatic enzyme CYP3A4, with contribution from the CYP3A5 and CYP2C isoforms. The major viagra 100mg tablet price circulating metabolite, M1, results from desethylation at the piperazine moiety of vardenafil. The plasma concentration of M1 is approximately 26% that of the parent compound. This metabolite shows a phosphodiesterase selectivity profile similar to that of vardenafil and an in vitro inhibitory potency for PDE5 28% of that of vardenafil.
Therefore, M1 accounts for approximately 7% of total pharmacologic activity.
The total body clearance of vardenafil is 56 L/h, and the terminal half-life of vardenafil and its primary metabolite (M1) is approximately 4-5 hours. After oral administration, vardenafil is excreted as metabolites predominantly in the feces (approximately 91-95% of administered oral dose) and to a lesser extent in the urine (approximately 2-6% of administered oral dose).
LEVITRA is not indicated for use in pediatric patients. Vardenafil trials were not conducted in the pediatric population.
In a healthy volunteer study of elderly males (?65 years) and younger males (18–45 years), mean Cmax and AUC were 34% and 52% higher, respectively, in the elderly males [see Use In Specific Populations ]. In volunteers with mild hepatic impairment (Child-Pugh A), the Cmax and AUC following a 10 mg vardenafil dose were increased by 22% and 17%, respectively, compared to healthy control subjects. In volunteers with moderate hepatic impairment (Child-Pugh B), the Cmax and AUC following a 10 mg vardenafil dose were increased by 130% and 160%, respectively, compared to healthy control subjects.
Vardenafil has not been evaluated in patients with severe (Child-Pugh C) hepatic impairment.
[See DOSAGE AND ADMINISTRATION , WARNINGS AND PRECAUTIONS and Use In Specific Populations ] Renal Impairment. In male volunteers with CL cr = 50.80 mL/min, the pharmacokinetics of vardenafil were similar to those observed in a control group with CLcr >80 mL/min.
In male volunteers with CL cr = 30.50 mL/min or CL cr 80 mL/min). Vardenafil pharmacokinetics have not been evaluated in patients requiring renal dialysis.
[See DOSAGE AND ADMINISTRATION , WARNINGS AND PRECAUTIONS and Use In Specific Populations ].
LEVITRA was evaluated in four
major double-blind, randomized, placebo-controlled, fixed-dose, parallel design, multicenter trials in 2431 men aged 20-83 (mean age 57 years; 78% White, 7% Black, 2% Asian, 3% Hispanic and 10% Other/Unknown). The doses of LEVITRA in these studies were 5 mg, 10 mg, and 20 mg.
Two of these trials were conducted in the general erectile dysfunction (ED) population and two in special ED populations (one in patients with diabetes mellitus and one in post-prostatectomy patients). LEVITRA was dosed without regard to meals on an as needed basis in men with ED, many of whom had multiple other medical conditions. Primary efficacy assessment in all four major trials was by means of the Erectile Function (EF) Domain score of the validated International Index of Erectile Function (IIEF) Questionnaire and two questions from the Sexual Encounter Profile (SEP) dealing with
the ability to achieve vaginal penetration (SEP2), and the ability to maintain an erection long enough for successful intercourse (SEP3).
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