Sildenafil 100mg

This analysis was performed retrospectively, and was not powered to detect any pre-specified difference in adverse reactions.

Medical uses

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 Clinical Pharmacology (12.3)].Of the total number of subjects in clinical studies of sildenafil, 18% were 65 years and older, while 2% were 75 years and older. No overall differences in safety or efficacy were observed between older ( >65 years of age) and younger (< 65 years of age) subjects.However, since higher plasma levels may increase the incidence of adverse reactions, a starting dose of 25 mg should be considered in older subjects due to the higher systemic exposure [ see Dosage and Administration (2.5)].8.6 Renal ImpairmentNo dose adjustment is required for mild (CLcr=50 to 80 mL/min) and moderate (CLcr = 30 to 49 mL/min) renal impairment. In volunteers with severe renal impairment (Clcr<30 mL/min), sildenafil clearance was reduced, resulting in higher plasma exposure of sildenafil (~2 fold), approximately doubling of C maxand AUC. A starting dose of 25 mg should be considered in patients with severe renal impairment [ see Dosage and Administration (2.5)and Clinical Pharmacology (12.3)] .8.7 Hepatic ImpairmentIn volunteers with hepatic impairment (Child-Pugh Class A and B), sildenafil clearance was reduced, resulting in higher plasma exposure of sildenafil (47% for C maxand 85% for AUC). The pharmacokinetics of sildenafil in patients with severely impaired hepatic function (Child-Pugh Class C) have not been studied.

What’s the best sildenafil dosage for beginners?

A starting dose of 25 mg should be considered in patients with any degree of hepatic impairment [ see Dosage and Administration (2.5) and Clinical Pharmacology (12.3)] . Sildenafil is not indicated for use in females. There are no data with the use of sildenafil in pregnant women to inform any drug-associated risks for adverse developmental outcomes. Animal reproduction studies conducted with sildenafil did not show adverse developmental outcomes when administered during organogenesis in rats and rabbits at oral doses up to 16 and 32 times, respectively, the maximum recommended human dose (MRHD) of 100 mg/day on a mg/m 2basis ( see Data). No evidence of teratogenicity, embryotoxicity or fetotoxicity was observed in rats and rabbits which received oral doses up to 200 mg/kg/day during organogenesis.

How does sildenafil work (mechanism of action)?

In the rat pre- and postnatal development study, the no observed adverse effect dose was 30 mg/kg/day given for 36 days, about 2 times the MRHD on a mg/m 2basis in a 50 kg subject. Limited data indicate that sildenafil and its active metabolite sildenafil citrate 200mg price are present in human milk. There is no information on the effects on the breastfed child, or the effects on milk production. No dose adjustment is required for mild (CLcr=50 to 80 mL/min) and moderate (CLcr = 30 to 49 mL/min) renal impairment. A starting dose of 25 mg should be considered in patients with severe renal impairment [ see Dosage and Administration (2.5)and Clinical Pharmacology (12.3)] . 7 DRUG INTERACTIONS 7.1 NitratesAdministration of sildenafil with nitric oxide donors such as organic nitrates or organic nitrites in any form is contraindicated. Consistent with its known effects on the nitric oxide/cGMP pathway, sildenafil was shown to potentiate the hypotensive effects of nitrates [ see Dosage and Administration (2.3), Contraindications (4.1), Clinical Pharmacology (12.2)] .7.2 Alpha-blockersUse caution when co-administering alpha-blockers with sildenafil because of potential additive blood pressure-lowering effects. When sildenafil is co-administered with an alpha-blocker, patients should be stable on alpha-blocker therapy prior to initiating sildenafil treatment and sildenafil should be initiated at the lowest dose [ see Dosage and Administration (2.3), Warnings and Precautions (5.5), Clinical Pharmacology (12.2)] .7.3 AmlodipineWhen sildenafil 100 mg was co-administered with amlodipine (5 mg or 10 mg) to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic [ see Warnings and Precautions (5.5), Clinical Pharmacology (12.2)].7.4 Ritonavir and Other CYP3A4 InhibitorsCo-administration of ritonavir, a strong CYP3A4 inhibitor, greatly increased the systemic exposure of sildenafil (11-fold increase in AUC). It is therefore recommended not to exceed a maximum single dose of 25 mg of sildenafil in a 48 hour period [ see Dosage and Administration (2.4), Warnings and Precautions (5.6), Clinical Pharmacology (12.3)].Co-administration of erythromycin, a moderate CYP3A4 inhibitor, resulted in a 160% and 182% increases in sildenafil C maxand AUC, respectively.

• Sildenafil 100 mg tablets are primarily used to treat erectile dysfunction.
• The medication works by increasing blood flow to the penis.
• It is usually taken 30-60 minutes before sexual activity.
• Do not take more than one tablet per 24 hours to avoid overdose.
• Common side effects include headache, flushing, and nasal congestion.
• Sildenafil 100 mg should be used only under medical supervision.
• Avoid consuming high-fat meals close to the time of intake.
• It may interact with nitrates, leading to dangerous blood pressure drops.
• Store in a cool, dry place away from children and pets.

Co-administration of saquinavir, a strong CYP3A4 inhibitor, resulted in 140% and 210% increases in sildenafil C maxand AUC, respectively.

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Stronger CYP3A4 inhibitors such as ketoconazole or itraconazole could be expected to have greater effects than seen with saquinavir.

7.3 Amlodipine

A starting dose of 25 mg of sildenafil should be considered in patients taking erythromycin or strong CYP3A4 inhibitors (such as saquinavir, ketoconazole, itraconazole) [ see Dosage and Administration (2.4), Clinical Pharmacology (12.3)] .7.5 AlcoholIn a drug-drug interaction study sildenafil 50 mg given with alcohol 0.5 g/kg in which mean maximum blood alcohol levels of 0.08% was achieved, sildenafil did not potentiate the hypotensive effect of alcohol in healthy volunteers [ see Clinical Pharmacology (12.2)]. When sildenafil 100 mg was co-administered with amlodipine (5 mg or 10 mg) to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic [ see Warnings and Precautions (5.5), Clinical Pharmacology (12.2)]. 8 USE IN SPECIFIC POPULATIONS 8.1 sildenafil premature ejaculation PregnancyRisk SummarySildenafil is not indicated for use in females.There are no data with the use of sildenafil in pregnant women to inform any drug-associated risks for adverse developmental outcomes. Animal reproduction studies conducted with sildenafil did not show adverse developmental outcomes when administered during organogenesis in rats and rabbits at oral doses up to 16 and 32 times, respectively, the maximum recommended human dose (MRHD) of 100 mg/day on a mg/m 2basis ( see Data).DataAnimal DataNo evidence of teratogenicity, embryotoxicity or fetotoxicity was observed in rats and rabbits which received oral doses up to 200 mg/kg/day during organogenesis. These doses represent, respectively, about 16 and 32 times the MRHD on a mg/m 2basis in a 50 kg subject.

• Sildenafil 100 mg is part of a class of drugs called PDE5 inhibitors.
• It can be used in combination with other ED treatments if prescribed.
• Avoid using medications or supplements not approved by your doctor.
• The effect of sildenafil can be reduced by certain foods and medications.
• Be aware of your health conditions and discuss them with your doctor.
• Use the medication responsibly to minimize potential risks.
• Sildenafil should be used with caution in people with hepatic impairment.
• Check with your doctor if you experience persistent side effects.
• Never take medication that is not prescribed for you.

In the rat pre- and postnatal development study, the no observed adverse effect dose was 30 mg/kg/day given for 36 days, about 2 times the MRHD on a mg/m 2basis in a 50 kg subject.8.2 LactationRisk SummarySildenafil is not indicated for use in females.Limited data indicate that sildenafil and its active metabolite are present in human milk.

Dosage for Viagra

There is no information on the effects on the breastfed child, or the effects on milk production.8.4 Pediatric UseSildenafil is not indicated for use in pediatric patients. Safety and effectiveness have not been established in pediatric patients.8.5 Geriatric UseHealthy 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 young volunteers (18 to 45 years) [ see Clinical Pharmacology (12.3)].

Parameter	Value	Description
Absorption Time	30-60 minutes	Time to reach peak plasma concentration
Bioavailability	40%	Percentage of dose that reaches systemic circulation
Half-life	4-5 hours	Time for plasma concentration to reduce by half
Metabolism	Liver (primarily CYP3A4)	Enzymes responsible for breakdown
Excretion	Feces and urine	Routes of elimination

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 Clinical Pharmacology (12.3)].Of the total number of subjects in clinical studies of sildenafil, 18% were 65 years and older, while 2% were 75 years and older. No overall differences in safety or efficacy were observed between older ( >65 years of age) and younger (< 65 years of age) subjects.However, since higher plasma levels may increase the incidence of adverse reactions, a starting dose of 25 mg should be considered in older subjects due to the higher systemic exposure [ see Dosage and Administration (2.5)].8.6 Renal ImpairmentNo dose adjustment is required for mild (CLcr=50 to 80 mL/min) and moderate (CLcr = 30 to 49 mL/min) renal impairment.

Interacting Drug Type	Specific Drugs	Effect on Sildenafil	Clinical Significance
Nitrates	Nitroglycerin, Isosorbide Mononitrate	Potentiate hypotension	Contraindicated
Alpha-blockers	Doxazosin, Tamsulosin	Enhance hypotensive effect	Caution advised
CYP3A4 Inhibitors	Ketoconazole, Ritonavir	Increase sildenafil levels	Dose adjustment may be needed
CYP3A4 Inducers	Rifampin, Phenytoin	Decrease sildenafil effectiveness	May require dosage adjustment

In volunteers with severe renal impairment (Clcr<30 mL/min), sildenafil clearance was reduced, resulting in higher plasma exposure of sildenafil (~2 fold), approximately doubling of C maxand AUC. A starting dose of 25 mg should be considered in patients with severe renal impairment [ see Dosage and Administration (2.5)and Clinical Pharmacology (12.3)] .8.7 Hepatic ImpairmentIn volunteers with hepatic impairment (Child-Pugh Class A and B), sildenafil clearance was reduced, resulting in higher plasma exposure of sildenafil (47% for C maxand 85% for AUC). The pharmacokinetics of sildenafil in patients with severely impaired hepatic function (Child-Pugh Class C) have not been studied.

8.1 Pregnancy

10 OVERDOSAGE In studies with healthy volunteers of single doses 20mg sildenafil up to 800 mg, adverse reactions were similar to those seen at lower doses but incidence rates and severities were increased.In cases of overdose, standard supportive measures should be adopted as required. Renal dialysis is not expected to accelerate clearance as sildenafil is highly bound to plasma proteins and it is not eliminated in the urine. In studies with healthy volunteers of single doses up to 800 mg, adverse reactions were similar to those seen at lower doses but incidence rates and severities were increased. Each tablet contains sildenafil citrate USP equivalent to 25 mg, 50 mg and 100 mg of sildenafil. Sildenafil tablets USP, an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).

Adjusting Your Sildenafil Dosage Over Time

Sildenafil tablets, USP are formulated as white to off-white, diamond shaped, biconvex, film-coated tablets for oral administration. 12 CLINICAL PHARMACOLOGY 12.1 Mechanism of ActionThe physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation. NO then activates the enzyme guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood.Sildenafil enhances the effect of NO by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. When sexual stimulation causes local release of NO, inhibition of PDE5 by sildenafil causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.Binding CharacteristicsStudies in vitrohave shown that sildenafil is selective for PDE5.

What’s the youngest age for which Viagra is safe to use?

Its effect is more potent on PDE5 than on other known phosphodiesterases (10-fold for PDE6, >80-fold for PDE1, >700-fold for PDE2, PDE3, PDE4, PDE7, PDE8, PDE9, PDE10, and PDE11). Sildenafil is approximately 4,000-fold more selective for PDE5 compared to PDE3. PDE3 is involved in control of cardiac contractility. Sildenafil is only about 10-fold as potent for PDE5 compared to PDE6, an enzyme found in the retina which is involved in the phototransduction pathway of the retina. A starting dose of 25 mg should be considered in patients with any degree of hepatic impairment [ see Dosage and Administration (2.5) and Clinical Pharmacology (12.3)] . Sildenafil is not indicated for use in females. There are no data with the use of sildenafil in pregnant women to inform any drug-associated risks for adverse developmental outcomes. Animal reproduction studies conducted with sildenafil did not show adverse developmental outcomes when administered during organogenesis in rats and rabbits at oral doses up to 16 and 32 times, respectively, the maximum recommended human dose (MRHD) of 100 mg/day on a mg/m 2basis ( see Data). No evidence of teratogenicity, embryotoxicity or fetotoxicity was observed in rats and rabbits which received oral doses up to 200 mg/kg/day during organogenesis. In the rat pre- and postnatal development study, the no observed adverse effect dose was 30 mg/kg/day given for 36 days, about 2 times the MRHD on a mg/m 2basis in a 50 kg subject. Limited data indicate that sildenafil and its active metabolite sildenafil citrate 200mg price are present in human milk.

Frequently asked questions

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There is no information on the effects on the breastfed child, or the effects on milk production.

• Sildenafil was originally developed to treat pulmonary hypertension.
• The 100 mg dosage is often prescribed when lower doses are ineffective.
• It can cause vision changes such as blurred vision or a blue tint.
• Alcohol consumption can enhance side effects and reduce effectiveness.
• Patients with heart conditions should consult a doctor before use.
• The medication is available by prescription only in many countries.
• Use with caution in patients with kidney or liver impairment.
• Report any allergic reactions like rash or difficulty breathing immediately.
• Sildenafil may cause dizziness; avoid operating heavy machinery after intake.

No dose adjustment is required for mild (CLcr=50 to 80 mL/min) and moderate (CLcr = 30 to 49 mL/min) renal impairment. A starting dose of 25 mg should be considered in patients with severe renal impairment [ see Dosage and Administration (2.5)and Clinical Pharmacology (12.3)] . 10 OVERDOSAGE In studies with healthy volunteers of single doses 20mg sildenafil up to 800 mg, adverse reactions were similar to those seen at lower doses but incidence rates and severities were increased.In cases of overdose, standard supportive measures should be adopted as required. Renal dialysis is not expected to accelerate clearance as sildenafil is highly bound to plasma proteins and it is not eliminated in the urine. In studies with healthy volunteers of single doses up to 800 mg, adverse reactions were similar to those seen at lower doses but incidence rates and severities were increased. Each tablet contains sildenafil citrate USP equivalent to 25 mg, 50 mg and 100 mg of sildenafil.

• The pill is oval-shaped and often light blue in color.
• It should not be chewed or crushed; swallow whole with water.
• Do not use sildenafil if you have a condition affecting your heart.
• Keep track of your dosage to prevent accidental overuse.
• It’s effective for about 4-6 hours after taking the tablet.
• Some users may experience indigestion or stomach upset.
• Using sildenafil with certain medications can increase side effects.
• Consult your healthcare provider for personalized dosage recommendations.
• Avoid grapefruit or grapefruit juice while using sildenafil.

Sildenafil tablets USP, an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Sildenafil tablets, USP are formulated as white to off-white, diamond shaped, biconvex, film-coated tablets for oral administration. 12 CLINICAL PHARMACOLOGY 12.1 Mechanism of ActionThe physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation.

Other uses for this medicine

This analysis was performed retrospectively, and was not powered to detect any pre-specified difference in adverse reactions. 7 DRUG INTERACTIONS 7.1 NitratesAdministration of sildenafil with nitric oxide donors such as organic nitrates or organic nitrites in any form is contraindicated. Consistent with its known effects on the nitric oxide/cGMP pathway, sildenafil was shown to potentiate the hypotensive effects of nitrates [ see Dosage and Administration (2.3), Contraindications (4.1), Clinical Pharmacology (12.2)] .7.2 Alpha-blockersUse caution when co-administering alpha-blockers with sildenafil because of potential additive blood pressure-lowering effects. When sildenafil is co-administered with an alpha-blocker, patients should be stable on alpha-blocker therapy prior to initiating sildenafil treatment and sildenafil should be initiated at the lowest dose [ see Dosage and Administration (2.3), Warnings and Precautions (5.5), Clinical Pharmacology (12.2)] .7.3 AmlodipineWhen sildenafil 100 mg was co-administered with amlodipine (5 mg or 10 mg) to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic [ see Warnings and Precautions (5.5), Clinical Pharmacology (12.2)].7.4 Ritonavir and Other CYP3A4 InhibitorsCo-administration of ritonavir, a strong CYP3A4 inhibitor, greatly increased the systemic exposure of sildenafil (11-fold increase in AUC). It is therefore recommended not to exceed a maximum single dose of 25 mg of sildenafil in a 48 hour period [ see Dosage and Administration (2.4), Warnings and Precautions (5.6), Clinical Pharmacology (12.3)].Co-administration of erythromycin, a moderate CYP3A4 inhibitor, resulted in a 160% and 182% increases in sildenafil C maxand AUC, respectively.

Natural and over-the-counter alternatives for ED

Co-administration of saquinavir, a strong CYP3A4 inhibitor, resulted in 140% and 210% increases in sildenafil C maxand AUC, respectively. Stronger CYP3A4 inhibitors such as ketoconazole or itraconazole could be expected to have greater effects than seen with saquinavir. A starting dose of 25 mg of sildenafil should be considered in patients taking erythromycin or strong CYP3A4 inhibitors (such as saquinavir, ketoconazole, itraconazole) [ see Dosage and Administration (2.4), Clinical Pharmacology (12.3)] .7.5 AlcoholIn a drug-drug interaction study sildenafil 50 mg given with alcohol 0.5 g/kg in which mean maximum blood alcohol levels of 0.08% was achieved, sildenafil did not potentiate the hypotensive effect of alcohol in healthy volunteers [ see Clinical Pharmacology (12.2)]. When sildenafil 100 mg was co-administered with amlodipine (5 mg or 10 mg) to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic [ see Warnings and Precautions (5.5), Clinical Pharmacology (12.2)]. 8 USE IN SPECIFIC POPULATIONS 8.1 sildenafil premature ejaculation PregnancyRisk SummarySildenafil is not indicated for use in females.There are no data with the use of sildenafil in pregnant women to inform any drug-associated risks for adverse developmental outcomes.

Cessation and Adverse Effects of Treatment

Animal reproduction studies conducted with sildenafil did not show adverse developmental outcomes when administered during organogenesis in rats and rabbits at oral doses up to 16 and 32 times, respectively, the maximum recommended human dose (MRHD) of 100 mg/day on a mg/m 2basis ( see Data).DataAnimal DataNo evidence of teratogenicity, embryotoxicity or fetotoxicity was observed in rats and rabbits which received oral doses up to 200 mg/kg/day during organogenesis. These doses represent, respectively, about 16 and 32 times the MRHD on a mg/m 2basis in a 50 kg subject. In the rat pre- and postnatal development study, the no observed adverse effect dose was 30 mg/kg/day given for 36 days, about 2 times the MRHD on a mg/m 2basis in a 50 kg subject.8.2 LactationRisk SummarySildenafil is not indicated for use in females.Limited data indicate that sildenafil and its active metabolite are present in human milk. There is no information on the effects on the breastfed child, or the effects on milk production.8.4 Pediatric UseSildenafil is not indicated for use in pediatric patients. Safety and effectiveness have not been established in pediatric patients.8.5 Geriatric UseHealthy 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 young volunteers (18 to 45 years) [ see Clinical Pharmacology (12.3)]. NO then activates the enzyme guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood.Sildenafil enhances the effect of NO by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. When sexual stimulation causes local release of NO, inhibition of PDE5 by sildenafil causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.Binding CharacteristicsStudies in vitrohave shown that sildenafil is selective for PDE5. Its effect is more potent on PDE5 than on other known phosphodiesterases (10-fold for PDE6, >80-fold for PDE1, >700-fold for PDE2, PDE3, PDE4, PDE7, PDE8, PDE9, PDE10, and PDE11). Sildenafil is approximately 4,000-fold more selective for PDE5 compared to PDE3. PDE3 is involved in control of cardiac contractility. Sildenafil is only about 10-fold as potent for PDE5 compared to PDE6, an enzyme found in the retina which is involved in the phototransduction pathway of the retina.

Condition	Risk	Recommendations
Use of Nitrates	Severe hypotension risk	Do not co-administer
Severe Liver Impairment	Altered drug metabolism	Consult healthcare provider
Retinitis Pigmentosa	Potential risk of vision issues	Use with caution
Recent Stroke or Heart Attack	Cardiac stress	Medical evaluation required
Hypotension (Low Blood Pressure)	Worsening symptoms	Monitor blood pressure during use