Sildenafil Citrate And Dapoxetine Tablets

Effects ofsildenafil tablets on Blood Pressure When Nitroglycerin is subsequently administered:Based on the pharmacokinetic profile of a single 100 mg oral dose given to healthy normal volunteers, the plasma levels of sildenafil at 24 hours post dose are approximately 2 ng/mL (compared to peak plasma levels of approximately 440 ng/mL). Although plasma levels of sildenafil at 24 hours post dose are much lower than at peak concentration, it is unknown whether nitrates can be safely co-administered at this time point [ see Contraindications (4.1)]. Effects ofSildenafil tablets on Blood Pressure When Co-administered with Alpha-Blockers:Three double-blind, placebo-controlled, randomized, two-way crossover studies were conducted to assess the interaction of sildenafil tablets with doxazosin, an alpha-adrenergic blocking agent. In the first study, a single oral dose of sildenafil tablets100 mg or matching placebo was administered in a 2-period crossover design to 4 generally healthy males with benign prostatic hyperplasia (BPH). The mean subject age was 66.5 years. For the 17 subjects who received sildenafil tablets25 mg and matching placebo, the placebo-subtracted mean maximum decreases from baseline (95% CI) in systolic blood pressure were as follows: The mean profiles of the change from baseline in standing systolic blood pressure in subjects treated with doxazosin in combination with 25 mg sildenafil tablets or matching placebo are shown in Figure 2. Blood pressure was measured immediately pre-dose and at 15, 30, 45 minutes, and 1, 1.5, 2, 2.5, 3, 4, 6 and 8 hours after sildenafil tablets or matching placebo. No severe adverse events potentially related to blood pressure effects were reported in this group.

Aspect	Details	Recommendations
Abuse potential	Moderate, especially for recreational purposes	Use only as prescribed
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Of the four subjects who received sildenafil tablets100 mg in the first part of this study, a severe adverse event related to blood pressure effect was reported in one patient (postural hypotension that began 35 minutes after dosing with sildenafil tablets with symptoms lasting for 8 hours), and mild adverse events potentially related to blood pressure effects were reported in two others (dizziness, headache and fatigue at 1 hour after dosing; and dizziness, lightheadedness and nausea at 4 hours after dosing).

• Sildenafil helps improve erectile response in men with ED.
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• Dapoxetine has a short half-life, suitable for on-demand use.
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• Both drugs are contraindicated in patients with certain heart problems.

Both of these subjects were protocol violators, one due to a low baseline standing SBP, and the other due to baseline orthostatic hypotension. In the second study, a single oral dose of sildenafil tablets 50 mg or matching placebo was administered in a 2-period crossover design to 20 generally healthy males with BPH.

Patients and methods

Blood pressure was measured after administration of sildenafil tablets at the same times as those specified for the first doxazosin study. There were no severe adverse events potentially related to blood pressure and no episodes of syncope reported in this study. In the third study, a single oral dose of sildenafil tablets 100 mg or matching placebo was administered in a 3-period crossover design to 20 generally healthy males with BPH. The mean subject age in this study was 66.4 years. Two were discontinued after study period 1: one failed to meet pre-dose screening qualifications and the other experienced symptomatic hypotension as a moderately severe adverse event 30 minutes after dosing with open-label sildenafil tablets 50 mg.

Foreign Names

Of the twenty subjects who were ultimately assigned to treatment, a total of 13 subjects successfully completed dose period 1, and seven had successfully completed the previous doxazosin study (using sildenafil tablets 50 mg). For the 20 subjects who received sildenafil tablets 100 mg and matching placebo, the placebo- subtracted mean maximum decreases from baseline (95% CI) in systolic blood pressure were as follows: The mean profiles of the change from baseline in standing systolic blood pressure in subjects treated with doxazosin in combination with 100 mg sildenafil tablets or matching placebo are shown in Figure 4. Blood pressure was measured after administration of sildenafil tablets at the same times as those specified for the previous doxazosin studies. There were no episodes of syncope reported in this study. Effect ofsildenafil tablets on Blood Pressure When Co-administered with Anti-hypertensives:When sildenafil tablets 100 mg oral was co-administered with amlodipine, 5 mg or 10 mg oral, to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic.

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Effect ofsildenafil tablets on Blood Pressure When Co-administered with Alcohol:Sildenafil tablets(50 mg) did not potentiate the hypotensive effect of alcohol (0.5 g/kg) in healthy volunteers with mean maximum blood alcohol levels of 0.08%. The maximum recommended dose of 100 mg sildenafil was not evaluated in this study [ see Drug Interactions (7.5)]. Effects ofsildenafil tablets on Cardiac Parameters:Single oral doses of sildenafil up to 100 mg produced no clinically relevant changes in the ECGs of normal male volunteers. Studies have produced relevant data on the effects of sildenafil tablets on cardiac output. A total dose of 40 mg sildenafil was administered by four intravenous infusions. The mean subject age in this study was 63.9 years. Twenty subjects received sildenafil tablets 50 mg, but only 19 subjects received matching placebo. This patient had been taking minoxidil, a potent vasodilator, during the study. For the 19 subjects who received both sildenafil tablets and matching placebo, the placebo-subtracted mean maximum decreases from baseline dapoxetine 60 mg buy online (95% CI) in systolic blood pressure were as follows: The mean profiles of the change from baseline in standing systolic blood pressure in subjects treated with doxazosin in combination with 50 mg sildenafil tablets or matching placebo are shown in Figure 3. Blood pressure was measured after administration of sildenafil tablets at the same times as those specified for the first doxazosin study.

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There were no severe adverse events potentially related to blood pressure and no episodes of syncope reported in this study. In the third study, a single oral dose of sildenafil tablets 100 mg or matching placebo was administered in a 3-period crossover design to 20 generally healthy males with BPH. The mean subject age in this study was 66.4 years. Two were discontinued after study period 1: one failed to meet pre-dose screening qualifications and the other experienced symptomatic hypotension as a moderately severe adverse event 30 minutes after dosing with open-label sildenafil tablets 50 mg. Of the twenty subjects who were ultimately assigned to treatment, a total of 13 subjects successfully completed dose period 1, and seven had successfully completed the previous doxazosin study (using sildenafil tablets 50 mg). For the 20 subjects who received sildenafil tablets 100 mg and matching placebo, the placebo- subtracted mean maximum decreases from baseline (95% CI) in systolic blood pressure were as follows: The mean profiles of the change from baseline in standing systolic blood pressure in subjects treated with doxazosin in combination with 100 mg sildenafil tablets or matching placebo are shown in Figure 4. Blood pressure was measured after administration of sildenafil tablets at the same times as those specified for the previous doxazosin studies. There were no episodes of syncope reported in this study.

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The results from this pilot study are shown in Table 3; the mean resting systolic and diastolic blood pressures decreased by 7% and 10% compared to baseline in these patients. Even though this total dosage produced plasma sildenafil concentrations which were approximately 2 to 5 times higher than the mean maximum plasma concentrations following a single oral dose of 100 mg in healthy male volunteers, the hemodynamic response to exercise was preserved in these patients. In a double-blind study, 144 patients with erectile dysfunction and chronic stable angina limited by exercise, not receiving chronic oral nitrates, were randomized to a single dose of placebo or sildenafil tablets 100 mg 1 hour prior to exercise testing. These results demonstrated that the effect of sildenafil tablets on the primary endpoint was statistically non-inferior to placebo. Effects ofsildenafil tablets on Vision:At single oral doses of 100 mg and 200 mg, transient dose- related impairment of color discrimination was detected using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels.

Neurocognitive safety

An evaluation of visual function at doses up to twice the maximum recommended dose revealed no effects of sildenafil tablets on visual priligy dapoxetine canada acuity, intraocular pressure, or pupillometry. Effects ofsildenafil tablets on Sperm: There was no effect on sperm motility or morphology after single 100 mg oral doses of sildenafil tablets in healthy volunteers. Sildenafil is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25–63%). Both sildenafil and the metabolite have terminal half lives of about 4 hours. Mean sildenafil plasma concentrations measured after the administration of a single oral dose of 100 mg to healthy male volunteers is depicted below: Absorption and Distribution:Sildenafil is rapidly absorbed.

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Protein binding is independent of total drug concentrations. Based upon measurements of sildenafil in semen of healthy volunteers 90 minutes after dosing, less than 0.001% of the administered dose may appear in the semen of patients. Metabolism and Excretion:Sildenafil is cleared predominantly by the CYP3A4 (major route) and CYP2C9 (minor route) hepatic microsomal isoenzymes. Plasma concentrations of this metabolite are approximately 40% of those seen for sildenafil, so that the metabolite accounts for about 20% of sildenafil's pharmacologic effects. After either oral or intravenous administration, sildenafil is excreted as metabolites predominantly in the feces (approximately 80% of administered oral dose) and to a lesser extent in the urine (approximately 13% of the administered oral dose). Effect ofsildenafil tablets on Blood Pressure When Co-administered with Anti-hypertensives:When sildenafil tablets 100 mg oral was co-administered with amlodipine, 5 mg or 10 mg oral, to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic. Effect ofsildenafil tablets on Blood Pressure When Co-administered with Alcohol:Sildenafil tablets(50 mg) did not potentiate the hypotensive effect of alcohol (0.5 g/kg) in healthy volunteers with mean maximum blood alcohol levels of 0.08%.

8.4 Pediatric Use

Similar values for pharmacokinetic parameters were seen in normal volunteers and in the patient population, using a population pharmacokinetic approach. Geriatrics:Healthy elderly volunteers (65 years or over) had a reduced clearance of sildenafil, resulting in approximately 84% and 107% higher plasma AUC values of sildenafil and its active N-desmethyl metabolite, respectively, compared to those seen in healthy younger volunteers (18–45 years). Due to age-differences in plasma protein binding, the corresponding increase in the AUC of free (unbound) sildenafil and its active N-desmethyl metabolite were 45% and 57%, respectively [ see Dosage and Administration (2.5), and Use in Specific Populations (8.5)] Renal Impairment:In volunteers with mild (CLcr=50–80 mL/min) and moderate (CLcr=30–49 mL/min) renal impairment, the pharmacokinetics of a single oral dose of sildenafil (50 mg) were not altered. In volunteers with severe (CLcr <30 mL/min) renal impairment, sildenafil clearance was reduced, resulting in approximately doubling of AUC and C maxcompared to age-matched volunteers with no renal impairment [ see Dosage and Administration (2.5), and Use in Specific Populations (8.6)]. In addition, N-desmethyl metabolite AUC and C maxvalues significantly increased by 200% and 79%, respectively in subjects with severe renal impairment compared to subjects with normal renal function.

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Hepatic Impairment:In volunteers with hepatic impairment (Child-Pugh Class A and B), sildenafil clearance was reduced, resulting in increases in AUC (85%) and C max(47%) compared to age-matched volunteers with no hepatic impairment.

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The maximum recommended dose of 100 mg sildenafil was not evaluated in this study [ see Drug Interactions (7.5)]. Effects ofsildenafil tablets on Cardiac Parameters:Single oral doses of sildenafil up to 100 mg produced no clinically relevant changes in the ECGs of normal male volunteers. Studies have produced relevant data on the effects of sildenafil tablets on cardiac output.

• Sildenafil is used to treat erectile dysfunction in men.
• Dapoxetine is primarily prescribed for premature ejaculation.
• Sildenafil increases blood flow to the penis during arousal.
• Dapoxetine works by delaying serotonin reuptake, extending ejaculation time.
• Both medications require a prescription from a healthcare provider.
• Sildenafil usually takes about 30-60 minutes to work.
• Dapoxetine is typically taken 1-3 hours before sexual activity.
• Combining sildenafil and dapoxetine should only be done under medical guidance.

A total dose of 40 mg sildenafil was administered by four intravenous infusions. The results from this pilot study are shown in Table 3; the mean resting systolic and diastolic blood pressures decreased by 7% and 10% compared to baseline in these patients.

• Sildenafil was first approved by the FDA in 1998.
• Dapoxetine was developed specifically for premature ejaculation treatment.
• Both drugs are available in tablet form for oral administration.
• Use of sildenafil may be affected by certain eye conditions.
• Dapoxetine is absorbed quickly and metabolized mainly in the liver.
• Patients should follow the dosage instructions strictly.
• Avoid taking sildenafil with large quantities of grapefruit juice.
• Dapoxetine has been shown to be effective in clinical trials.

Even though this total dosage produced plasma sildenafil concentrations which were approximately 2 to 5 times higher than the mean maximum plasma concentrations following a single oral dose of 100 mg in healthy male volunteers, the hemodynamic response to exercise was preserved in these patients. In a double-blind study, 144 patients with erectile dysfunction and chronic stable angina limited by exercise, not receiving chronic oral nitrates, were randomized to a single dose of placebo or sildenafil tablets 100 mg 1 hour prior to exercise testing. These results demonstrated that the effect of sildenafil tablets on the primary endpoint was statistically non-inferior to placebo. Effects ofsildenafil tablets on Vision:At single oral doses of 100 mg and 200 mg, transient dose- related impairment of color discrimination was detected using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels. An evaluation of visual function at doses up to twice the maximum recommended dose revealed no effects of sildenafil tablets on visual priligy dapoxetine canada acuity, intraocular pressure, or pupillometry. Effects ofsildenafil tablets on Sperm: There was no effect on sperm motility or morphology after single 100 mg oral doses of sildenafil tablets in healthy volunteers. Sildenafil is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25–63%). Both sildenafil and the metabolite have terminal half lives of about 4 hours. Mean sildenafil plasma concentrations measured after the administration of a single oral dose of 100 mg to healthy male volunteers is depicted below: Absorption and Distribution:Sildenafil is rapidly absorbed.

• Consistent use of sildenafil can help maintain erectile function.
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• Dapoxetine's short half-life minimizes residual effects.
• Patients should inform healthcare providers about all current medications.

Protein binding is independent of total drug concentrations. Based upon measurements of sildenafil in semen of healthy volunteers 90 minutes after dosing, less than 0.001% of the administered dose may appear in the semen of patients. Metabolism and Excretion:Sildenafil is cleared predominantly by the CYP3A4 (major route) and CYP2C9 (minor route) hepatic microsomal isoenzymes. Plasma concentrations of this metabolite are approximately 40% of those seen for sildenafil, so that the metabolite accounts for about 20% of sildenafil's pharmacologic effects. After either oral or intravenous administration, sildenafil is excreted as metabolites predominantly in the feces (approximately 80% of administered oral dose) and to a lesser extent in the urine (approximately 13% of the administered oral dose). Similar values for pharmacokinetic parameters were seen in normal volunteers and in the patient population, using a population pharmacokinetic approach. Geriatrics:Healthy elderly volunteers (65 years or over) had a reduced clearance of sildenafil, resulting in approximately 84% and 107% higher plasma AUC values of sildenafil and its active N-desmethyl metabolite, respectively, compared to those seen in healthy younger volunteers (18–45 years).

4.3 Concomitant Guanylate Cyclase (GC) Stimulators

Due to age-differences in plasma protein binding, the corresponding increase in the AUC of free (unbound) sildenafil and its active N-desmethyl metabolite were 45% and 57%, respectively [ see Dosage and Administration (2.5), and Use in Specific Populations (8.5)] Renal Impairment:In volunteers with mild (CLcr=50–80 mL/min) and moderate (CLcr=30–49 mL/min) renal impairment, the pharmacokinetics of a single oral dose of sildenafil (50 mg) were not altered. In volunteers with severe (CLcr <30 mL/min) renal impairment, sildenafil clearance was reduced, resulting in approximately doubling of AUC and C maxcompared to age-matched volunteers with no renal impairment [ see Dosage and Administration (2.5), and Use in Specific Populations (8.6)].

4.2 Hypersensitivity Reactions

Effects ofsildenafil tablets on Blood Pressure When Nitroglycerin is subsequently administered:Based on the pharmacokinetic profile of a single 100 mg oral dose given to healthy normal volunteers, the plasma levels of sildenafil at 24 hours post dose are approximately 2 ng/mL (compared to peak plasma levels of approximately 440 ng/mL). Although plasma levels of sildenafil at 24 hours post dose are much lower than at peak concentration, it is unknown whether nitrates can be safely co-administered at this time point [ see Contraindications (4.1)]. Effects ofSildenafil tablets on Blood Pressure When Co-administered with Alpha-Blockers:Three double-blind, placebo-controlled, randomized, two-way crossover studies were conducted to assess the interaction of sildenafil tablets with doxazosin, an alpha-adrenergic blocking agent. In the first study, a single oral dose of sildenafil tablets100 mg or matching placebo was administered in a 2-period crossover design to 4 generally healthy males with benign prostatic hyperplasia (BPH). The mean subject age was 66.5 years.

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For the 17 subjects who received sildenafil tablets25 mg and matching placebo, the placebo-subtracted mean maximum decreases from baseline (95% CI) in systolic blood pressure were as follows: The mean profiles of the change from baseline in standing systolic blood pressure in subjects treated with doxazosin in combination with 25 mg sildenafil tablets or matching placebo are shown in Figure 2. Blood pressure was measured immediately pre-dose and at 15, 30, 45 minutes, and 1, 1.5, 2, 2.5, 3, 4, 6 and 8 hours after sildenafil tablets or matching placebo. No severe adverse events potentially related to blood pressure effects were reported in this group. Of the four subjects who received sildenafil tablets100 mg in the first part of this study, a severe adverse event related to blood pressure effect was reported in one patient (postural hypotension that began 35 minutes after dosing with sildenafil tablets with symptoms lasting for 8 hours), and mild adverse events potentially related to blood pressure effects were reported in two others (dizziness, headache and fatigue at 1 hour after dosing; and dizziness, lightheadedness and nausea at 4 hours after dosing). Both of these subjects were protocol violators, one due to a low baseline standing SBP, and the other due to baseline orthostatic hypotension.

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In the second study, a single oral dose of sildenafil tablets 50 mg or matching placebo was administered in a 2-period crossover design to 20 generally healthy males with BPH. The mean subject age in this study was 63.9 years. Twenty subjects received sildenafil tablets 50 mg, but only 19 subjects received matching placebo. This patient had been taking minoxidil, a potent vasodilator, during the study. For the 19 subjects who received both sildenafil tablets and matching placebo, the placebo-subtracted mean maximum decreases from baseline dapoxetine 60 mg buy online (95% CI) in systolic blood pressure were as follows: The mean profiles of the change from baseline in standing systolic blood pressure in subjects treated with doxazosin in combination with 50 mg sildenafil tablets or matching placebo are shown in Figure 3. In addition, N-desmethyl metabolite AUC and C maxvalues significantly increased by 200% and 79%, respectively in subjects with severe renal impairment compared to subjects with normal renal function. Hepatic Impairment:In volunteers with hepatic impairment (Child-Pugh Class A and B), sildenafil clearance was reduced, resulting in increases in AUC (85%) and C max(47%) compared to age-matched volunteers with no hepatic impairment.

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