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Individuals with “crowded” optic disc are also considered at greater risk for NAION compared to the general population, however, evidence is insufficient to support screening of prospective users of PDE5 inhibitors, including sildenafil tablets, for this uncommon condition. There are no controlled clinical data on the safety or efficacy of sildenafil tablets in patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases); if prescribed, this should be done with caution. Physicians should advise patients to stop use of all phosphodiesterase type 5 (PDE5) inhibitors, including sildenafil tablets, and seek medical attention in the event of a sudden loss of vision in one or both eyes. Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION), a rare condition and a cause of decreased vision including permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors. Based on published literature, the annual incidence of NAION is 2.5 to 11.8 cases per 100,000 in males aged ≥ 50.

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An observational case-crossover study evaluated the risk of NAION when PDE5 inhibitor use, as a class, occurred immediately before NAION onset (within 5 half-lives), compared to PDE5 inhibitor use in a prior time period. The results suggest an approximate 2-fold increase in the risk of NAION, with a risk estimate of 2.15 (95% CI 1.06, 4.34). Other risk factors for NAION, such as the presence of “crowded” sildenafil 50 mg tab optic disc, may have contributed to the occurrence of NAION in these studies. Neither the rare post-marketing reports, nor the association of PDE5 inhibitor use and NAION in the observational studies, substantiate a causal relationship between PDE5 inhibitor use and NAION [see Adverse Reactions (6.2)].Physicians should consider whether their patients with underlying NAION risk factors could be adversely affected by use of PDE5 inhibitors. Individuals with “crowded” optic disc are also considered at greater risk for NAION compared to the general population, however, evidence is insufficient to support screening of prospective users of PDE5 inhibitors, including sildenafil tablets, for this uncommon condition.There are no controlled clinical data on the safety or efficacy of sildenafil tablets in patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases); if prescribed, this should be done with caution.5.4 Hearing LossPhysicians should advise patients to stop taking PDE5 inhibitors, including sildenafil tablets, and seek prompt medical attention in the event of sudden decrease or loss of hearing.

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These events, which may be accompanied by tinnitus and dizziness, have been reported in temporal association to the intake of PDE5 inhibitors, including sildenafil tablets. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors [see Adverse Reactions (6.1, 6.2)].5.5 Hypotension when Co-administered with Alpha-blockers or Anti-hypertensivesAlpha-blockersCaution is advised when PDE5 inhibitors are co-administered with alpha-blockers. PDE5 inhibitors, including sildenafil tablets, 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 occur. In some patients, concomitant use of these two drug classes can lower blood pressure significantly [see Drug Interactions (7.2)and Clinical Pharmacology (12.2)]leading to symptomatic hypotension (e.g., dizziness, lightheadedness, fainting).Consideration should be given to the following:•Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors. Physicians should advise patients to stop use of all phosphodiesterase type 5 (PDE5) inhibitors, including sildenafil tablets, and seek medical attention in the event of a sudden loss of vision in one or both eyes.

Ingredient	Quantity per Tablet	Function	Note
Sildenafil Citrate	50 mg	Active pharmaceutical ingredient	Main active component
Croscarmellose Sodium	20 mg	Disintegrant	Ensures tablet breaks down
Lactose Monohydrate	150 mg	Filler	Used as excipient
Magnesium Stearate	5 mg	Lubricant	Facilitates manufacturing
Microcrystalline Cellulose	100 mg	Binder	Holds tablet together

Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION), a rare condition and a cause of decreased vision including permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors. Based on published literature, the annual incidence of NAION is 2.5 to 11.8 cases per 100,000 in males aged ≥ 50.

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Other risk factors for NAION, such as the presence of “crowded” sildenafil 50 mg tab optic disc, may have contributed to the occurrence of NAION in these studies. Neither the rare post-marketing reports, nor the association of PDE5 inhibitor use and NAION in the observational studies, substantiate a causal relationship between PDE5 inhibitor use and NAION [see Adverse Reactions (6.2)].Physicians should consider whether their patients with underlying NAION risk factors could be adversely affected by use of PDE5 inhibitors. Individuals with “crowded” optic disc are also considered at greater risk for NAION compared to the general population, however, evidence is insufficient to support screening of prospective users of PDE5 inhibitors, including sildenafil tablets, for this uncommon condition.There are no controlled clinical data on the safety or efficacy of sildenafil tablets in patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases); if prescribed, this should be done with caution.5.4 Hearing LossPhysicians should advise patients to stop taking PDE5 inhibitors, including sildenafil tablets, and seek prompt medical attention in the event of sudden decrease or loss of hearing.

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These events, which may be accompanied by tinnitus and dizziness, have been reported in temporal association to the intake of PDE5 inhibitors, including sildenafil tablets.

Take sildenafil on an empty stomach or after a light meal for quicker absorption.
It does not provide automatic erection; sexual stimulation is needed.
Follow dosage instructions precisely to ensure safety.

It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors [see Adverse Reactions (6.1, 6.2)].5.5 Hypotension when Co-administered with Alpha-blockers or Anti-hypertensivesAlpha-blockersCaution is advised when PDE5 inhibitors are co-administered with alpha-blockers.

Use Case	Description	Onset Time	Duration of Effect	Typical Dosage Advice
Erectile Dysfunction	Enhances blood flow to the penis for erection	30-60 min	4-6 hours	Take 1 hour before activity
Pulmonary Hypertension	Relaxes blood vessels in lungs	Varies	Up to 4 hours	As prescribed by doctor
Off-label uses	Certain cases of altitude sickness or Raynaud's phenomenon	Varies	Variable	Under medical supervision

PDE5 inhibitors, including sildenafil tablets, and alpha-adrenergic blocking agents are both vasodilators with blood pressure lowering effects.

The medication is not intended for use by women or children.
Effectiveness may vary depending on individual health and age.
Regular exercise and healthy lifestyle can improve outcomes.

When vasodilators are used in combination, an additive effect on blood pressure may occur. In some patients, concomitant use of these two drug classes can lower blood pressure significantly [see Drug Interactions (7.2)and Clinical Pharmacology (12.2)]leading to symptomatic hypotension (e.g., dizziness, lightheadedness, fainting).Consideration should be given to the following:•Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors. Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor.In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest dose [see Dosage and Administration (2.3)].•In those patients already taking an optimized dose of a PDE5 inhibitor, alpha-blocker therapy should be initiated at the lowest dose. Stepwise increase in alpha-blocker dose may be associated with further lowering of blood pressure when taking a PDE5 inhibitor.•Safety of combined use of PDE5 inhibitors and alpha-blockers may be affected by other variables, including intravascular volume depletion and other anti-hypertensive drugs.Anti-hypertensivesSildenafil tablets have systemic vasodilatory properties and may further lower blood pressure in patients taking anti-hypertensive medications.In a separate drug interaction study, when amlodipine, 5 mg or 10 mg, and sildenafil tablets, 100 mg were orally administered concomitantly to hypertensive patients mean additional blood pressure reduction of 8 mmHg systolic and 7 mmHg diastolic were noted[see Drug Interactions (7.3) and Clinical Pharmacology (12.2)].5.6 Adverse Reactions with the Concomitant Use of RitonavirThe concomitant administration of the protease inhibitor ritonavir substantially increases serum concentrations of sildenafil (11-fold increase in AUC).

Do not exceed one tablet per 24 hours to avoid side effects.
Consult a doctor before starting sildenafil, especially if you have heart issues.
Avoid alcohol and fat-rich meals around the time of intake.

If sildenafil tablets are prescribed to patients taking ritonavir, caution should be used.

5.7 Priapism

If priapism is not treated immediately, penile tissue damage and permanent loss of potency could result. should advise patients to stop use of all phosphodiesterase type 5 (PDE5) inhibitors, including sildenafil tablets, and seek medical attention in the event of a sudden loss of vision in one or both eyes. Neither the rare post-marketing reports, nor the association of PDE5 inhibitor use and NAION in the observational studies, substantiate a causal relationship between PDE5 inhibitor use and NAION [see Adverse Reactions (6.2)]. Physicians should advise patients to stop taking PDE5 inhibitors, including sildenafil tablets, and seek prompt medical attention in the event of sudden decrease or loss of hearing. It is not possible to determine whether these events are related directly sildenafil citrate tables to the use of PDE5 inhibitors or to other factors [see Adverse Reactions (6.1, 6.2)].

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To decrease the chance of adverse reactions in patients taking ritonavir, a decrease in sildenafil dosage is recommended [see Dosage and Administration (2.4), Drug Interactions (7.4), and Clinical Pharmacology (12.3)]. The safety and efficacy of combinations of sildenafil tablets with other PDE5 Inhibitors, including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil, or other treatments for erectile dysfunction have not been studied. Therefore, the use of such combinations is not recommended. There have been postmarketing reports of bleeding events in patients who have taken sildenafil tablets. In addition, the combination of heparin and sildenafil tablets had an additive effect on bleeding time in the anesthetized rabbit, but this interaction has not been studied in humans.

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The use of sildenafil tablets offers no protection against sexually transmitted diseases. 6 ADVERSE REACTIONS The following are discussed in more detail in other sections of the labeling:•Cardiovascular [see Warnings and Precautions (5.1)]•Prolonged Erection and Priapism [see Warnings and Precautions (5.2)]•Effects on the Eye [see Warnings and Precautions (5.3)]•Hearing Loss [ see Warnings and Precautions (5.4)]•Hypotension when Co-administered with Alpha-blockers or Anti-hypertensives [see Warnings and Precautions (5.5)]•Adverse Reactions with the Concomitant Use of Ritonavir [see Warnings and Precautions (5.6)]•Combination with other PDE5 Inhibitors or Other Erectile Dysfunction Therapies [see Warnings and Precautions (5.7)]•Effects on Bleeding [see Warnings and Precautions (5.8)]•Counseling Patients About Sexually Transmitted Diseases [see Warnings and Precautions (5.9)]The most common adverse reactions reported in clinical trials (≥ 2%) are headache, flushing, dyspepsia, abnormal vision, nasal congestion, back pain, myalgia, nausea, dizziness, and rash.6.1 Clinical Trials ExperienceBecause clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.Sildenafil tablets were administered to over 3700 patients (aged 19 to 87 years) during pre-marketing clinical trials worldwide. Data from subjects exposed to high systemic levels of sildenafil are limited. Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of sildenafil (200 to 800 mg). To decrease the chance of adverse reactions in patients taking ritonavir, a decrease in sildenafil dosage is recommended [see Dosage and Administration (2.4), Drug Interactions (7.4), and Clinical Pharmacology (12.3)].5.7 Combination with other PDE5 Inhibitors or Other Erectile Dysfunction TherapiesThe safety and efficacy of combinations of sildenafil tablets with other PDE5 Inhibitors, including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil, or other treatments for erectile dysfunction have not been studied. Such combinations sildenafil citrate tablets for female may further lower blood pressure.

5.4 Hearing Loss

Therefore, the use of such combinations is not recommended.5.8 Effects on BleedingThere have been postmarketing reports of bleeding events in patients who have taken sildenafil tablets. A causal relationship between sildenafil tablets and these events has not been established. In humans, sildenafil tablets have no effect on bleeding time when taken alone or with aspirin. However, in vitro studies with human platelets indicate that sildenafil potentiates the antiaggregatory effect of sodium nitroprusside (a nitric oxide donor). In addition, the combination of heparin and sildenafil tablets had an additive effect on bleeding time in the anesthetized rabbit, but this interaction has not been studied in humans.The safety of sildenafil tablets is unknown in patients with bleeding disorders and patients with active peptic ulceration.5.9 Counseling Patients About Sexually Transmitted DiseasesThe use of sildenafil tablets offers no protection against sexually transmitted diseases. Counseling of patients about the protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), may be considered. There is a potential for cardiac risk of sexual activity in patients with preexisting cardiovascular disease. 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 tablets.

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Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor.In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest dose [see Dosage and Administration (2.3)].•In those patients already taking an optimized dose of a PDE5 inhibitor, alpha-blocker therapy should be initiated at the lowest dose. Stepwise increase in alpha-blocker dose may be associated with further lowering of blood pressure when taking a PDE5 inhibitor.•Safety of combined use of PDE5 inhibitors and alpha-blockers may be affected by other variables, including intravascular volume depletion and other anti-hypertensive drugs.Anti-hypertensivesSildenafil tablets have systemic vasodilatory properties and may further lower blood pressure in patients taking anti-hypertensive medications.In a separate drug interaction study, when amlodipine, 5 mg or 10 mg, and sildenafil tablets, 100 mg were orally administered concomitantly to hypertensive patients mean additional blood pressure reduction of 8 mmHg systolic and 7 mmHg diastolic were noted[see Drug Interactions (7.3) and Clinical Pharmacology (12.2)].5.6 Adverse Reactions with the Concomitant Use of RitonavirThe concomitant administration of the protease inhibitor ritonavir substantially increases serum concentrations of sildenafil (11-fold increase in AUC). If sildenafil tablets are prescribed to patients taking ritonavir, caution should be used. Data from subjects exposed to high systemic levels of sildenafil are limited. Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of sildenafil (200 to 800 mg).

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To decrease the chance of adverse reactions in patients taking ritonavir, a decrease in sildenafil dosage is recommended [see Dosage and Administration (2.4), Drug Interactions (7.4), and Clinical Pharmacology (12.3)].5.7 Combination with other PDE5 Inhibitors or Other Erectile Dysfunction TherapiesThe safety and efficacy of combinations of sildenafil tablets with other PDE5 Inhibitors, including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil, or other treatments for erectile dysfunction have not been studied. Such combinations sildenafil citrate tablets for female may further lower blood pressure. Therefore, the use of such combinations is not recommended.5.8 Effects on BleedingThere have been postmarketing reports of bleeding events in patients who have taken sildenafil tablets. A causal relationship between sildenafil tablets and these events has not been established. In humans, sildenafil tablets have no effect on bleeding time when taken alone or with aspirin.

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However, in vitro studies with human platelets indicate that sildenafil potentiates the antiaggregatory effect of sodium nitroprusside (a nitric oxide donor). In addition, the combination of heparin and sildenafil tablets had an additive effect on bleeding time in the anesthetized rabbit, but this interaction has not been studied in humans.The safety of sildenafil tablets is unknown in patients with bleeding disorders and patients with active peptic ulceration.5.9 Counseling Patients About Sexually Transmitted DiseasesThe use of sildenafil tablets offers no protection against sexually transmitted diseases. Counseling of patients about the protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), may be considered. There is a potential for cardiac risk of sexual activity in patients with preexisting cardiovascular disease. 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 tablets. If priapism is not treated immediately, penile tissue damage and permanent loss of potency could result. should advise patients to stop use of all phosphodiesterase type 5 (PDE5) inhibitors, including sildenafil tablets, and seek medical attention in the event of a sudden loss of vision in one or both eyes. Neither the rare post-marketing reports, nor the association of PDE5 inhibitor use and NAION in the observational studies, substantiate a causal relationship between PDE5 inhibitor use and NAION [see Adverse Reactions (6.2)]. Physicians should advise patients to stop taking PDE5 inhibitors, including sildenafil tablets, and seek prompt medical attention in the event of sudden decrease or loss of hearing. It is not possible to determine whether these events are related directly sildenafil citrate tables to the use of PDE5 inhibitors or to other factors [see Adverse Reactions (6.1, 6.2)]. To decrease the chance of adverse reactions in patients taking ritonavir, a decrease in sildenafil dosage is recommended [see Dosage and Administration (2.4), Drug Interactions (7.4), and Clinical Pharmacology (12.3)]. The safety and efficacy of combinations of sildenafil tablets with other PDE5 Inhibitors, including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil, or other treatments for erectile dysfunction have not been studied. Therefore, the use of such combinations is not recommended. There have been postmarketing reports of bleeding events in patients who have taken sildenafil tablets.

Condition	Caution or Contraindication	Rationale
Use of Nitrates	Contraindicated	Risk of dangerous blood pressure drop
Severe Liver Impairment	Use with caution	Altered metabolism
Cardiovascular disease	Consult doctor before use	Potential strain on heart
Retinal Disorders	Caution; consult healthcare provider	Risk of vision-related side effects

In addition, the combination of heparin and sildenafil tablets had an additive effect on bleeding time in the anesthetized rabbit, but this interaction has not been studied in humans. The use of sildenafil tablets offers no protection against sexually transmitted diseases. 6 ADVERSE REACTIONS The following are discussed in more detail in other sections of the labeling:•Cardiovascular [see Warnings and Precautions (5.1)]•Prolonged Erection and Priapism [see Warnings and Precautions (5.2)]•Effects on the Eye [see Warnings and Precautions (5.3)]•Hearing Loss [ see Warnings and Precautions (5.4)]•Hypotension when Co-administered with Alpha-blockers or Anti-hypertensives [see Warnings and Precautions (5.5)]•Adverse Reactions with the Concomitant Use of Ritonavir [see Warnings and Precautions (5.6)]•Combination with other PDE5 Inhibitors or Other Erectile Dysfunction Therapies [see Warnings and Precautions (5.7)]•Effects on Bleeding [see Warnings and Precautions (5.8)]•Counseling Patients About Sexually Transmitted Diseases [see Warnings and Precautions (5.9)]The most common adverse reactions reported in clinical trials (≥ 2%) are headache, flushing, dyspepsia, abnormal vision, nasal congestion, back pain, myalgia, nausea, dizziness, and rash.6.1 Clinical Trials ExperienceBecause clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.Sildenafil tablets were administered to over 3700 patients (aged 19 to 87 years) during pre-marketing clinical trials worldwide.

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