DRUG INTERACTIONS

Cimetidine (800 mg), a nonspecific CYP inhibitor, caused a 56% increase in plasma Sildenafil concentrations when coadministered with Sildenafil (50 mg) to healthy volunteers. When a single 100 mg dose of Sildenafil was administered with erythromycin, a specific CYP3A4 inhibitor, at steady state (500 mg bid for 5 days), there was a 182% increase in Sildenafil systemic exposure (AUC). In addition, in a study performed in healthy male volunteers, co-administration of the HIV protease inhibitor saquinavir, also a CYP3A4 inhibitor, at steady state (1200 mg tid) with Sildenafil (100 mg single dose) resulted in a 140% increase in Sildenafil Cmax and a 210% increase in Sildenafil AUC. Stronger CYP3A4 inhibitors such as ketoconazole or itraconazole would be expected to have still greater effects, and population data from patients in clinical trials did indicate a reduction in Sildenafil clearance when it was coadministered with CYP3A4 inhibitors (such as ketoconazole, erythromycin, or cimetidine). In another study in healthy male volunteers, coadministration with the HIV protease inhibitor ritonavir, which is a highly potent P450 inhibitor, at steady state (500 mg bid) with Sildenafil (100 mg single dose) resulted in a 300% (4-fold) increase in Sildenafil Cmax and a 1000% (11-fold) increase in Sildenafil plasma AUC. This is consistent with ritonavir's marked effects on a broad range of P450 substrates.

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In a study of healthy male volunteers, co-administration of Sildenafil at steady state (80 mg t.i.d.) with endothelin receptor antagonist bosentan (a moderate inducer of CYP3A4, CYP2C9 and possibly of cytochrome P450 2C19) at steady state (125 mg b.i.d.) resulted in a 63% decrease of Sildenafil AUC and a 55% decrease in Sildenafil Cmax. Single doses of antacid (magnesium hydroxide/aluminum hydroxide) did not affect the bioavailability of Sildenafil.

7.4 Ritonavir and other CYP3A4 inhibitors

To decrease the chance of adverse events in patients taking ritonavir, a decrease in Sildenafil dosage is recommended. In studies with healthy volunteers of single doses up to 800 mg, adverse events were similar to those seen at lower doses but incidence rates and severities were increased. 24 In cases of overdose, standard supportive measures should be adopted as required. Keep in a dry place, away from light and heat. Keep out of the reach of children.

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Mechanism of Action: The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation. Sildenafil has no direct relaxant effect on isolated human corpus cavernosum, but enhances the effect of nitric oxide (NO) by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.Pharmacokinetics and Metabolism: Sildenafil is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25-63%). It is eliminated predominantly by hepatic metabolism (mainly cytochrome P450 3A4) and is converted to an active metabolite with properties similar to the parent, Sildenafil. Both Sildenafil and the metabolite have terminal half lives of about 4 hours.Absorption and Distribution: Sildenafil is rapidly absorbed. The AUC of the active metabolite, N-desmethyl Sildenafil, was increased 62% by loop and potassium-sparing diuretics and 102% by 16 nonspecific beta-blockers.

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Sildenafil is contraindicated in patient with hypersensitivity to any component of this medication. Sildenafil potentiates the hypotensive effects of nitrates, so it is contraindicated in patients who are using organic nitrates, either regularly or intermittently. Many of these events were reported to occur during or shortly after sexual activity, and a few were reported to occur shortly after the use of Sildenafil without sexual activity.

Your Personalized Health Plan

In some patients, concomitant use of these two drug classes can lower blood pressure significantly leading to symptomatic hypotension (e.g. dizziness, lightheadedness, fainting).Consideration should be given to the following: Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors. In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest dose. A stepwise increase in alpha-blocker dose may be associated with further lowering of blood pressure when taking a PDE5 inhibitor.

Sildenafil side effects

Sildenafil has systemic vasodilatory properties and may augment the blood pressure-lowering effect of other anti-hypertensive medications. Patients on multiple antihypertensive medications were included in the pivotal clinical trials for Sildenafil. In a separate drug interaction study, when amlodipine, 5 mg or 10 mg, and Sildenafil, 100 mg were orally administered concomitantly to hypertensive patients mean additional blood pressure reduction of 8 mmHg systolic and 7 mmHg diastolic were noted. The safety of Sildenafil is unknown in patients with bleeding disorders and patients with active peptic ulceration. Sildenafil should be used with caution in patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis or Peyronie's disease), or in patients who have conditions which may predispose them to priapism (such as sickle cell anemia, multiple myeloma, or leukemia). Others were reported to have occurred hours to days after the use of Sildenafil and sexual activity. It is not possible to determine whether these events are related directly to Sildenafil, to sexual activity, to the patient's underlying 23 cardiovascular disease, to a combination of these factors, or to other factors.Nervous: seizure, seizure recurrence, anxiety, and transient global amnesia.Urogenital: prolonged erection, priapism and hematuria.Special Senses: diplopia, temporary vision loss/decreased vision, ocular redness or bloodshot appearance, ocular burning, ocular swelling/pressure, increased intraocular pressure, retinal vascular disease or bleeding, vitreous detachment/traction, paramacular edema and epistaxis. There are no adequate and well-controlled studies of Sildenafil in pregnant women.

Who Should Not Take Sildenafil Citrate FM 100mg?

Sildenafil potentiates the hypotensive effects of nitrates, so it is contraindicated in patients who are using organic nitrates, either regularly or intermittently. Many of these events were reported to occur during or shortly after sexual activity, and a few were reported to occur shortly after the use of Sildenafil without sexual activity. Others were reported to have occurred hours to days after the use of Sildenafil and sexual activity. It is not possible to determine whether these events are related directly to Sildenafil, to sexual activity, to the patient's underlying 23 cardiovascular disease, to a combination of these factors, or to other factors.Nervous: seizure, seizure recurrence, anxiety, and transient global amnesia.Urogenital: prolonged erection, priapism and hematuria.Special Senses: diplopia, temporary vision loss/decreased vision, ocular redness or bloodshot appearance, ocular burning, ocular swelling/pressure, increased intraocular pressure, retinal vascular disease or bleeding, vitreous detachment/traction, paramacular edema and epistaxis. There are no adequate and well-controlled studies of Sildenafil in pregnant women.

Why can Suhagra 100 Tablet lower blood pressure?

Sildenafil is not indicated for use by women. In animal study shows that Sildenafil has no evidence of teratogenicity or embryotoxicity. General: The evaluation of erectile dysfunction should include a determination of potential underlying causes and the identification blue sex pills of appropriate treatment following a complete medical assessment.Before prescribing Sildenafil, it is important to note the following: Caution is advised when Phosphodiesterase Type 5 (PDE5) inhibitors are co-administered with alpha-blockers. PDE5 inhibitors, including Sildenafil, and alpha-adrenergic blocking agents are both vasodilators with blood-pressure-lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated. Sildenafil is not indicated for use by women.

Age Group	Percentage of Users	Common Reasons for Use
18-30	35%	Performance enhancement, curiosity
31-45	45%	Erectile dysfunction, libido boost
46-60	15%	Age-related sexual concerns
60+	5%	Prescribed use, health issues

In animal study shows that Sildenafil has no evidence of teratogenicity or embryotoxicity. General: The evaluation of erectile dysfunction should include a determination of potential underlying causes and the identification blue sex pills of appropriate treatment following a complete medical assessment.Before prescribing Sildenafil, it is important to note the following: Caution is advised when Phosphodiesterase Type 5 (PDE5) inhibitors are co-administered with alpha-blockers.

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When Sildenafil is taken with a high fat meal, the rate of absorption is reduced.Metabolism and Excretion: Sildenafil is cleared by hepatic microsomal isoenzymes. 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).Pharmacokinetics in Special Populations: 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 compared to those seen in healthy younger volunteers. The information provided is accurate to our best practices, but it does not replace professional medical advice.

Can Suhagra 100 Tablet be used for premature ejaculation?

PDE5 inhibitors, including Sildenafil, and alpha-adrenergic blocking agents are both vasodilators with blood-pressure-lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated.

Viagra side effects

Cimetidine (800 mg), a nonspecific CYP inhibitor, caused a 56% increase in plasma Sildenafil concentrations when coadministered with Sildenafil (50 mg) to healthy volunteers. When a single 100 mg dose of Sildenafil was administered with erythromycin, a specific CYP3A4 inhibitor, at steady state (500 mg bid for 5 days), there was a 182% increase in Sildenafil systemic exposure (AUC). In addition, in a study performed in healthy male volunteers, co-administration of the HIV protease inhibitor saquinavir, also a CYP3A4 inhibitor, at steady state (1200 mg tid) with Sildenafil (100 mg single dose) resulted in a 140% increase in Sildenafil Cmax and a 210% increase in Sildenafil AUC. Stronger CYP3A4 inhibitors such as ketoconazole or itraconazole would be expected to have still greater effects, and population data from patients in clinical trials did indicate a reduction in Sildenafil clearance when it was coadministered with CYP3A4 inhibitors (such as ketoconazole, erythromycin, or cimetidine). In another study in healthy male volunteers, coadministration with the HIV protease inhibitor ritonavir, which is a highly potent P450 inhibitor, at steady state (500 mg bid) with Sildenafil (100 mg single dose) resulted in a 300% (4-fold) increase in Sildenafil Cmax and a 1000% (11-fold) increase in Sildenafil plasma AUC.

How quickly does Sildenafil Tablets USP work?

This is consistent with ritonavir's marked effects on a broad range of P450 substrates. In a study of healthy male volunteers, co-administration of Sildenafil at steady state (80 mg t.i.d.) with endothelin receptor antagonist bosentan (a moderate inducer of CYP3A4, CYP2C9 and possibly of cytochrome P450 2C19) at steady state (125 mg b.i.d.) resulted in a 63% decrease of Sildenafil AUC and a 55% decrease in Sildenafil Cmax. Single doses of antacid (magnesium hydroxide/aluminum hydroxide) did not affect the bioavailability of Sildenafil. The AUC of the active metabolite, N-desmethyl Sildenafil, was increased 62% by loop and potassium-sparing diuretics and 102% by 16 nonspecific beta-blockers. Sildenafil is contraindicated in patient with hypersensitivity to any component of this medication. In some patients, concomitant use of these two drug classes can lower blood pressure significantly leading to symptomatic hypotension (e.g. dizziness, lightheadedness, fainting).Consideration should be given to the following: Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors. In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest dose. A stepwise increase in alpha-blocker dose may be associated with further lowering of blood pressure when taking a PDE5 inhibitor. Sildenafil has systemic vasodilatory properties and may augment the blood pressure-lowering effect of other anti-hypertensive medications. Patients on multiple antihypertensive medications were included in the pivotal clinical trials for Sildenafil. In a separate drug interaction study, when amlodipine, 5 mg or 10 mg, and Sildenafil, 100 mg were orally administered concomitantly to hypertensive patients mean additional blood pressure reduction of 8 mmHg systolic and 7 mmHg diastolic were noted. The safety of Sildenafil is unknown in patients with bleeding disorders and patients with active peptic ulceration. Sildenafil should be used with caution in patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis or Peyronie's disease), or in patients who have conditions which may predispose them to priapism (such as sickle cell anemia, multiple myeloma, or leukemia). The safety and efficacy of combinations of Sildenafil with other treatments for erectile dysfunction have not been studied.

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Therefore, treatments for erectile dysfunction, including Sildenafil, should not be generally used in men for whom sexual activity is inadvisable because of their underlying cardiovascular status. Sildenafil has systemic vasodilatory properties that resulted in transient decreases in supine blood pressure in healthy volunteers (mean maximum decrease of 8.4/5.5 mmHg). While this normally would be expected to be of little consequence in most patients, prior to prescribing Sildenafil, physicians should carefully consider whether their patients with underlying cardiovascular disease could be affected adversely by such vasodilatory effects, especially in combination with sexual activity.Patients with the following underlying conditions can be particularly sensitive to the actions of vasodilators including Sildenafil - those with left ventricular outflow obstruction (e.g. aortic stenosis, idiopathic hypertrophic subaortic stenosis) and those with super p force uk severely impaired autonomic control of blood pressure.There is no controlled clinical data on the safety or efficacy of Sildenafil in the following groups; if prescribed, this should be done with caution. Patients who have suffered a myocardial infarction, stroke, or life-threatening arrhythmia within the last 6 months; Patients with resting hypotension (BP <90/50) or hypertension (BP >170/110); Patients with cardiac failure or coronary artery disease causing unstable angina; Patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases); Patients with sickle cell or related anemias.

Aspect	Details	Notes
Approval by medicines agencies	FDA (US), EMA (EU), TGA (Australia) approval statuses	Most branded tablets are approved, generics vary
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Prolonged erection greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of Sildenafil. If Sildenafil is prescribed to patients taking ritonavir, caution should be used. Visual disturbances occurred more commonly at higher levels of Sildenafil exposure. Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of Sildenafil (200-800 mg).

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To decrease the chance of adverse events in patients taking ritonavir, a decrease in Sildenafil dosage is recommended. In studies with healthy volunteers of single doses up to 800 mg, adverse events were similar to those seen at lower doses but incidence rates and severities were increased. 24 In cases of overdose, standard supportive measures should be adopted as required. Keep in a dry place, away from light and heat. Keep out of the reach of children.

Benefits of the Medication

The safety and efficacy of combinations of Sildenafil with other treatments for erectile dysfunction have not been studied. Therefore, treatments for erectile dysfunction, including Sildenafil, should not be generally used in men for whom sexual activity is inadvisable because of their underlying cardiovascular status. Sildenafil has systemic vasodilatory properties that resulted in transient decreases in supine blood pressure in healthy volunteers (mean maximum decrease of 8.4/5.5 mmHg). While this normally would be expected to be of little consequence in most patients, prior to prescribing Sildenafil, physicians should carefully consider whether their patients with underlying cardiovascular disease could be affected adversely by such vasodilatory effects, especially in combination with sexual activity.Patients with the following underlying conditions can be particularly sensitive to the actions of vasodilators including Sildenafil - those with left ventricular outflow obstruction (e.g. aortic stenosis, idiopathic hypertrophic subaortic stenosis) and those with super p force uk severely impaired autonomic control of blood pressure.There is no controlled clinical data on the safety or efficacy of Sildenafil in the following groups; if prescribed, this should be done with caution.

Pharmacokinetics in Special Populations

Patients who have suffered a myocardial infarction, stroke, or life-threatening arrhythmia within the last 6 months; Patients with resting hypotension (BP <90/50) or hypertension (BP >170/110); Patients with cardiac failure or coronary artery disease causing unstable angina; Patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases); Patients with sickle cell or related anemias. Prolonged erection greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of Sildenafil. If Sildenafil is prescribed to patients taking ritonavir, caution should be used. Visual disturbances occurred more commonly at higher levels of Sildenafil exposure. Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of Sildenafil (200-800 mg). Mechanism of Action: The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation.

Side Effect	Severity	Occurrence Rate	Recommended Action
Headache	Mild	20%	Hydrate, take analgesics
Flushing	Mild	15%	Cool environment
Dizziness	Mild to Moderate	10%	Sit or lie down
Nasal Congestion	Mild	12%	Use decongestants
Nausea	Mild	8%	Eat before use

Sildenafil has no direct relaxant effect on isolated human corpus cavernosum, but enhances the effect of nitric oxide (NO) by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.Pharmacokinetics and Metabolism: Sildenafil is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25-63%). It is eliminated predominantly by hepatic metabolism (mainly cytochrome P450 3A4) and is converted to an active metabolite with properties similar to the parent, Sildenafil. Both Sildenafil and the metabolite have terminal half lives of about 4 hours.Absorption and Distribution: Sildenafil is rapidly absorbed. When Sildenafil is taken with a high fat meal, the rate of absorption is reduced.Metabolism and Excretion: Sildenafil is cleared by hepatic microsomal isoenzymes. 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).Pharmacokinetics in Special Populations: 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 compared to those seen in healthy younger volunteers. The information provided is accurate to our best practices, but it does not replace professional medical advice.