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Also collected as part of the IIEF was information about other aspects of sexual function, including information on erectile function, orgasm, desire, satisfaction with intercourse, and overall sexual satisfaction. Sexual function data were also recorded by patients in a daily diary. In addition, patients were asked a global efficacy question and an optional partner questionnaire was administered.Efficacy Results from Controlled Clinical StudiesThe effect on one of the major end points, maintenance of erections after penetration, is shown in Figure 6, for the pooled results of 5 fixed-dose, dose-response studies of greater than one month duration, showing response according to baseline function. Results with all doses have been pooled, but scores showed greater improvement at the 50 and 100 mg doses than at 25 mg. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse.
- Sildenafil 200 mg is a high dose used to treat severe erectile dysfunction.
- This medication increases blood flow to the penis for improved erection.
- It is important to follow a doctor's prescription for 200 mg dosage.
- Common side effects include headaches, flushing, and nasal congestion.
- Sildenafil should not be mixed with nitrates due to risk of low blood pressure.
- The drug is typically taken about an hour before sexual activity.
The titration studies, in which most patients received 100 mg, showed similar results.
4.1 Nitrates
Also collected as part of the IIEF was information about other aspects of sexual function, including information on erectile function, orgasm, desire, satisfaction with intercourse, and overall sexual satisfaction. Sexual function data were also recorded by patients in a daily diary. In addition, patients were asked a global efficacy question and an optional partner questionnaire was administered.Efficacy Results from Controlled Clinical StudiesThe effect on one of the major end points, maintenance of erections after penetration, is shown in Figure 6, for the pooled results of 5 fixed-dose, dose-response studies of greater than one month duration, showing response according to baseline function. Results with all doses have been pooled, but scores showed greater improvement at the 50 and 100 mg doses than at 25 mg. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse.
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The titration studies, in which most patients received 100 mg, showed similar results. Figure 6 shows that regardless of the baseline levels of function, subsequent function in patients treated with sildenafil was better than that seen in patients treated with placebo. At the same time, on-treatment function was better in treated patients who were less impaired at baseline.Figure 6. Effect of sildenafil and Placebo on Maintenance of Erection by Baseline Score.The frequency of patients reporting improvement of erections in response to a global question in four of the randomized, double-blind, parallel, placebo-controlled fixed dose studies (1797 patients) of 12 to 24 weeks duration is shown in Figure 7. These patients had erectile dysfunction at baseline that was characterized by median categorical scores of 2 (a few times) on principal IIEF questions.
2.4 Dosage Adjustments Due to Drug Interactions
Erectile dysfunction was attributed to organic (58%; generally not characterized, but including diabetes and excluding spinal cord injury), psychogenic (17%), or mixed (24%) etiologies. Sixty-three percent, 74%, buy pills sildenafil and 82% of the patients on 25 mg, 50 mg and 100 mg of sildenafil, respectively, reported an improvement in their erections, compared to 24% on placebo. In the titration studies (n=644) (with most patients eventually receiving 100 mg), results were similar.Overall treatment p<0.0001Figure 7. Percentage of Patients Reporting an Improvement in Erections.The patients in studies had varying degrees of ED. One-third to one-half of the subjects in these studies reported successful intercourse at least once during a 4-week, treatment-free run-in period.In many of the studies, of both fixed dose and titration designs, daily diaries were kept by patients. Figure 6 shows that regardless of the baseline levels of function, subsequent function in patients treated with sildenafil was better than that seen in patients treated with placebo. At the same time, on-treatment function was better in treated patients who were less impaired at baseline.Figure 6. Effect of sildenafil and Placebo on Maintenance of Erection by Baseline Score.The frequency of patients reporting improvement of erections in response to a global question in four of the randomized, double-blind, parallel, placebo-controlled fixed dose studies (1797 patients) of 12 to 24 weeks duration is shown in Figure 7.
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These patients had erectile dysfunction at baseline that was characterized by median categorical scores of 2 (a few times) on principal IIEF questions. Erectile dysfunction was attributed to organic (58%; generally not characterized, but including diabetes and excluding spinal cord injury), psychogenic (17%), or mixed (24%) etiologies. Sixty-three percent, 74%, buy pills sildenafil and 82% of the patients on 25 mg, 50 mg and 100 mg of sildenafil, respectively, reported an improvement in their erections, compared to 24% on placebo. In the titration studies (n=644) (with most patients eventually receiving 100 mg), results were similar.Overall treatment p<0.0001Figure 7. Percentage of Patients Reporting an Improvement in Erections.The patients in studies had varying degrees of ED. One-third to one-half of the subjects in these studies reported successful intercourse at least once during a 4-week, treatment-free run-in period.In many of the studies, of both fixed dose and titration designs, daily diaries were kept by patients. In these studies, involving about 1600 patients, analyses of patient diaries showed no effect of sildenafil on rates of attempted intercourse (about 2 per week), but there was clear treatment-related improvement in sexual function: per patient weekly success rates averaged 1.3 on 50-100 mg of sildenafil vs 0.4 on placebo; similarly, group mean success rates (total successes divided by total attempts) were about 66% on sildenafil vs about 20% on placebo.During 3 to 6 months of double-blind treatment or longer-term (1 year), open-label studies, few patients withdrew from active treatment for any reason, including lack of effectiveness.
| Interacting Drug/Class | Effect on Sildenafil | Clinical Significance | Recommendations |
|---|---|---|---|
| Nitrates | Potentiates vasodilation | Risk of severe hypotension | Avoid concomitant use |
| CYP3A4 inhibitors (e.g., Ritonavir) | Increase sildenafil plasma levels | Risk of increased side effects | Reduce dose or avoid |
| Alpha-blockers | Additive blood pressure lowering | Hypotension | Use with caution, monitor BP |
| CYP3A4 inducers (e.g., Rifampin) | Decrease sildenafil effectiveness | May reduce efficacy | Adjust dose accordingly |
At the end of the long-term study, 88% of patients reported that sildenafil improved their erections.Men with untreated ED had relatively low baseline scores for all aspects of sexual function measured (again using a 5-point scale) in over the counter drugs containing sildenafil the IIEF. Sildenafil improved these aspects of sexual function: frequency, firmness and maintenance of erections; frequency of orgasm; frequency and level of desire; frequency, satisfaction and enjoyment of intercourse; and overall relationship satisfaction.One randomized, double-blind, flexible-dose, placebo-controlled study included only patients with erectile dysfunction attributed to complications of diabetes mellitus (n=268).
| Parameter | Description | Typical Values | Notes |
|---|---|---|---|
| Absorption | Time to peak plasma concentration (Tmax) | 30-120 minutes | Taken on an empty stomach for faster absorption |
| Bioavailability | Percentage absorbed into bloodstream | 40% | Affected by food intake |
| Half-life | Duration for plasma concentration to reduce by half | 4 hours | Determines dosing frequency |
| Metabolism | Liver enzyme involved | CYP3A4 | Also metabolized by CYP2C9 |
As in the other titration studies, patients were started on 50 mg and allowed to adjust the dose up to 100 mg or down to 25 mg of sildenafil; all patients, however, were receiving 50 mg or 100 mg at the end of the study. There were highly statistically significant improvements on the two principal IIEF questions (frequency of successful penetration during sexual activity and maintenance of erections after penetration) on sildenafil compared to placebo. On a global improvement question, 57% of sildenafil patients reported improved erections versus 10% on placebo.
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In these studies, involving about 1600 patients, analyses of patient diaries showed no effect of sildenafil on rates of attempted intercourse (about 2 per week), but there was clear treatment-related improvement in sexual function: per patient weekly success rates averaged 1.3 on 50-100 mg of sildenafil vs 0.4 on placebo; similarly, group mean success rates (total successes divided by total attempts) were about 66% on sildenafil vs about 20% on placebo.During 3 to 6 months of double-blind treatment or longer-term (1 year), open-label studies, few patients withdrew from active treatment for any reason, including lack of effectiveness. At the end of the long-term study, 88% of patients reported that sildenafil improved their erections.Men with untreated ED had relatively low baseline scores for all aspects of sexual function measured (again using a 5-point scale) in over the counter drugs containing sildenafil the IIEF. Sildenafil improved these aspects of sexual function: frequency, firmness and maintenance of erections; frequency of orgasm; frequency and level of desire; frequency, satisfaction and enjoyment of intercourse; and overall relationship satisfaction.One randomized, double-blind, flexible-dose, placebo-controlled study included only patients with erectile dysfunction attributed to complications of diabetes mellitus (n=268). As in the other titration studies, patients were started on 50 mg and allowed to adjust the dose up to 100 mg or down to 25 mg of sildenafil; all patients, however, were receiving 50 mg or 100 mg at the end of the study. There were highly statistically significant improvements on the two principal IIEF questions (frequency of successful penetration during sexual activity and maintenance of erections after penetration) on sildenafil compared to placebo.
Organic Nitrates, Nitrites, and Nitric Oxide Donors
On a global improvement question, 57% of sildenafil patients reported improved erections versus 10% on placebo. Diary data indicated that on sildenafil, 48% of intercourse attempts were successful versus 12% on placebo.One randomized, double-blind, placebo-controlled, crossover, flexible-dose (up to 100 mg) study of patients with erectile dysfunction resulting from spinal cord injury (n=178) was conducted. The changes from baseline in scoring on the two end point questions (frequency of successful penetration during sexual activity and maintenance of erections after penetration) were highly statistically significantly in favor of sildenafil. On a global improvement question, 83% of patients reported improved erections on sildenafil versus 12% on placebo. Diary data indicated that on sildenafil, 59% of attempts at sexual intercourse were successful compared to 13% on placebo.Across all trials, sildenafil improved the erections of 43% of radical prostatectomy patients compared to 15% on placebo.Subgroup analyses of responses to a global improvement question in patients with psychogenic etiology in two fixed-dose studies (total n=179) and two titration studies (total n=149) showed 84% of sildenafil patients reported improvement in erections compared with 26% of placebo.
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Diary data in two of the studies (n=178) showed rates of successful intercourse per attempt of 70% for sildenafil and 29% for placebo.Efficacy Results in Subpopulations in Controlled Clinical StudiesA review of population subgroups demonstrated efficacy regardless of baseline severity, etiology, race and age. Sildenafil was effective in a broad range of ED patients, including those with a history of coronary artery disease, hypertension, other cardiac disease, peripheral vascular disease, diabetes mellitus, depression, coronary artery bypass graft (CABG), radical prostatectomy, transurethral resection of the prostate (TURP) and spinal cord injury, and in patients taking antidepressants/antipsychotics and anti-hypertensives/diuretics. In clinical studies, sildenafil was assessed for its effect on the ability of men with erectile dysfunction (ED) to engage in sexual activity and in many cases specifically on the ability to achieve and maintain an erection sufficient for satisfactory sexual activity. The studies that established benefit demonstrated improvements in success rates for sexual intercourse compared with placebo. Effect of sildenafil and Placebo sildenafil tablets lp 100 mg on Maintenance of Erection by Baseline Score. Diary data indicated that on sildenafil, 48% of intercourse attempts were successful versus 12% on placebo.One randomized, double-blind, placebo-controlled, crossover, flexible-dose (up to 100 mg) study of patients with erectile dysfunction resulting from spinal cord injury (n=178) was conducted. The changes from baseline in scoring on the two end point questions (frequency of successful penetration during sexual activity and maintenance of erections after penetration) were highly statistically significantly in favor of sildenafil. On a global improvement question, 83% of patients reported improved erections on sildenafil versus 12% on placebo.
- Men should avoid taking sildenafil on an empty stomach if prone to nausea.
- The drug may cause hiccups or flushing in some users.
- Inform your doctor of any past eye conditions before starting sildenafil.
- Do not use sildenafil within 24 hours of consuming large amounts of alcohol.
- It is essential to follow prescribed dosing to prevent complications.
- Understand that sildenafil does not protect against sexually transmitted diseases.
Diary data indicated that on sildenafil, 59% of attempts at sexual intercourse were successful compared to 13% on placebo.Across all trials, sildenafil improved the erections of 43% of radical prostatectomy patients compared to 15% on placebo.Subgroup analyses of responses to a global improvement question in patients with psychogenic etiology in two fixed-dose studies (total n=179) and two titration studies (total n=149) showed 84% of sildenafil patients reported improvement in erections compared with 26% of placebo. Diary data in two of the studies (n=178) showed rates of successful intercourse per attempt of 70% for sildenafil and 29% for placebo.Efficacy Results in Subpopulations in Controlled Clinical StudiesA review of population subgroups demonstrated efficacy regardless of baseline severity, etiology, race and age. Sildenafil was effective in a broad range of ED patients, including those with a history of coronary artery disease, hypertension, other cardiac disease, peripheral vascular disease, diabetes mellitus, depression, coronary artery bypass graft (CABG), radical prostatectomy, transurethral resection of the prostate (TURP) and spinal cord injury, and in patients taking antidepressants/antipsychotics and anti-hypertensives/diuretics.
- The effects of sildenafil 200 mg typically last for 4-6 hours.
- Do not take more than a prescribed dose to avoid overdose symptoms.
- Sildenafil's effectiveness varies based on individual health factors.
- It is available by prescription or from authorized pharmacies.
- The medication can cause priapism, a painful, persistent erection.
- Always follow dosing instructions to ensure safety and efficacy.
In clinical studies, sildenafil was assessed for its effect on the ability of men with erectile dysfunction (ED) to engage in sexual activity and in many cases specifically on the ability to achieve and maintain an erection sufficient for satisfactory sexual activity. The studies that established benefit demonstrated improvements in success rates for sexual intercourse compared with placebo. Effect of sildenafil and Placebo sildenafil tablets lp 100 mg on Maintenance of Erection by Baseline Score. 16 HOW SUPPLIED/STORAGE AND HANDLING Sildenafil tablets USP are supplied as pale blue to blue, caplet shaped film-coated tablets containing sildenafil citrate equivalent to the nominally indicated amount of sildenafil as follows:For 100 mg - Pale blue to blue, caplet shaped film-coated tablets, debossed with ‘1A1’ on one side and plain on other side.For 50 mg - Pale blue to blue, caplet shaped film-coated tablets, debossed with ‘1A2’ on one side and plain on other side.For 25 mg - Pale blue to blue, round film-coated tablets, debossed with “25” on one side and “SL” on other side.Recommended Storage:Store at 25°C (77°F); excursions permitted within 15-30°C (59-86°F) [see USP Controlled Room Temperature]. Sildenafil tablets USP are supplied as pale blue to blue, caplet shaped film-coated tablets containing sildenafil citrate equivalent to the nominally indicated amount of sildenafil as follows: Recommended Storage:Store at 25°C (77°F); excursions permitted within 15-30°C (59-86°F) [see USP Controlled Room Temperature]. 17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Patient Information)NitratesPhysicians should discuss with patients the contraindication of sildenafil with regular and/or intermittent use of nitric oxide donors, such as organic nitrates or organic nitrites in any form [ see Contraindications (4.1)].Guanylate Cyclase (GC) StimulatorsPhysicians should discuss with patients the contraindication of sildenafil with use of guanylate cyclase stimulators such as riociguat [ see Contraindications (4.3)].Concomitant Use with Drugs Which Lower Blood PressurePhysicians should advise patients of the potential for sildenafil to augment the blood pressure lowering effect of alpha-blockers and anti-hypertensive medications. Concomitant administration of sildenafil and an alpha - blocker may lead to symptomatic hypotension in some patients.
7.1 Nitrates
Key takeaways
Therefore, when sildenafil is co-administered with alpha-blockers, patients should be stable on alpha-blocker therapy prior to initiating sildenafil treatment and sildenafil should be initiated at the lowest dose [ see Warnings and Precautions (5.5)].Cardiovascular ConsiderationsPhysicians should discuss with patients the potential cardiac risk of sexual activity in patients with preexisting cardiovascular risk factors. Patients who experience symptoms (e.g., angina pectoris, dizziness, nausea) upon initiation of sexual activity should be advised to refrain from further activity and should discuss the episode with their physician [ seeWarnings and Precautions (5.1)].Sudden Loss of VisionPhysicians should advise patients to stop use of all PDE5 inhibitors, including sildenafil, and seek medical attention in the event of a sudden loss of vision in one or both eyes.
Advice To Patients
16 HOW SUPPLIED/STORAGE AND HANDLING Sildenafil tablets USP are supplied as pale blue to blue, caplet shaped film-coated tablets containing sildenafil citrate equivalent to the nominally indicated amount of sildenafil as follows:For 100 mg - Pale blue to blue, caplet shaped film-coated tablets, debossed with ‘1A1’ on one side and plain on other side.For 50 mg - Pale blue to blue, caplet shaped film-coated tablets, debossed with ‘1A2’ on one side and plain on other side.For 25 mg - Pale blue to blue, round film-coated tablets, debossed with “25” on one side and “SL” on other side.Recommended Storage:Store at 25°C (77°F); excursions permitted within 15-30°C (59-86°F) [see USP Controlled Room Temperature]. Sildenafil tablets USP are supplied as pale blue to blue, caplet shaped film-coated tablets containing sildenafil citrate equivalent to the nominally indicated amount of sildenafil as follows: Recommended Storage:Store at 25°C (77°F); excursions permitted within 15-30°C (59-86°F) [see USP Controlled Room Temperature]. 17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Patient Information)NitratesPhysicians should discuss with patients the contraindication of sildenafil with regular and/or intermittent use of nitric oxide donors, such as organic nitrates or organic nitrites in any form [ see Contraindications (4.1)].Guanylate Cyclase (GC) StimulatorsPhysicians should discuss with patients the contraindication of sildenafil with use of guanylate cyclase stimulators such as riociguat [ see Contraindications (4.3)].Concomitant Use with Drugs Which Lower Blood PressurePhysicians should advise patients of the potential for sildenafil to augment the blood pressure lowering effect of alpha-blockers and anti-hypertensive medications. Concomitant administration of sildenafil and an alpha - blocker may lead to symptomatic hypotension in some patients. Therefore, when sildenafil is co-administered with alpha-blockers, patients should be stable on alpha-blocker therapy prior to initiating sildenafil treatment and sildenafil should be initiated at the lowest dose [ see Warnings and Precautions (5.5)].Cardiovascular ConsiderationsPhysicians should discuss with patients the potential cardiac risk of sexual activity in patients with preexisting cardiovascular risk factors.
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Patients who experience symptoms (e.g., angina pectoris, dizziness, nausea) upon initiation of sexual activity should be advised to refrain from further activity and should discuss the episode with their physician [ seeWarnings and Precautions (5.1)].Sudden Loss of VisionPhysicians should advise patients to stop use of all PDE5 inhibitors, including sildenafil, 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 cause of decreased vision including possible permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors.
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Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION), a cause of decreased vision including possible permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors.
- Sildenafil 200 mg is not recommended for women or children.
- Overuse can lead to serious cardiovascular problems.
- The medication should be part of a comprehensive treatment plan.
- Use caution if combining sildenafil with other ED medications.
- Inform your healthcare provider of all health conditions before use.
- Ensure correct timing to maximize the drug's effectiveness.
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