Sildenafil dosing question

Concurrent use substantially increases the sildenafil plasma concentrations and may result in

Population Group	Effectiveness (%)	Notes
Men with ED	70–80%	Effective in most cases when taken as directed
Men on certain medications	60–75%	Slightly reduced effectiveness due to interactions
Older adults	65–80%	Slightly lower due to metabolic changes

increased associated adverse events including hypotension, syncope, visual changes, and prolonged erection.

Peds Dosing .

Levamlodipine: (Moderate) Monitor for additive hypotension if amlodipine is administered concurrently with sildenafil, as both agents act independently to reduce blood pressure. Levoketoconazole: (Major) Coadministration of ketoconazole is not recommended in patients receiving sildenafil for pulmonary arterial hypertension (PAH). Lonafarnib: (Major) Coadministration with lonafarnib is not recommended in patients receiving sildenafil for pulmonary arterial hypertension (PAH). When sildenafil is used for erectile dysfunction, consider a starting dose of 25 mg for patients receiving lonafarnib. Lopinavir; Ritonavir: (Major) Coadministration of ritonavir is contraindicated in patients receiving sildenafil for pulmonary arterial hypertension (PAH). Ritonavir, a strong CYP3A4 inhibitor, increased the AUC of sildenafil, a sensitive CYP3A4 substrate, by 11-fold in a drug interaction study.

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Lorcaserin: (Moderate) Lorcaserin is a serotonin 2C receptor agonist, and priapism is a potential effect of 5-HT2C receptor agonism.

Why has Viagra been approved?

Fenofibric Acid: (Minor) At therapeutic concentrations, fenofibric acid is a mild-to-moderate inhibitor of CYP2C9. Concomitant use of fenofibric acid with CYP2C9 substrates, such as sildenafil , has not been formally studied. Fenofibric acid may theoretically increase plasma concentrations of CYP2C9 substrates and could lead to toxicity for drugs that have a narrow therapeutic range. Monitor the therapeutic effect of sildenafil during coadministration with fenofibric acid. Fluconazole: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with fluconazole is necessary; consider a starting dose of 25 mg of sildenafil when prescribed for erectile dysfunction.

Viagra and foods

Fluvoxamine: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with fluvoxamine is necessary; a dose reduction of sildenafil may be necessary when prescribed for erectile dysfunction. In a drug interaction study, coadministration of fluvoxamine increased the sildenafil AUC by 40%. Fosamprenavir: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with fosamprenavir is necessary; consider a starting dose of 25 mg of sildenafil when prescribed for erectile dysfunction. When used for pulmonary arterial hypertension, this combination is listed as a contraindication in the fosamprenavir FDA-approved labeling. In a drug interaction study, coadministration with a moderate CYP3A inhibitor increased the Cmax and AUC of sildenafil by 160% and 182%, respectively. Because there is little experience with the combination of lorcaserin and medications indicated

Side Effect	Severity	Frequency	Notes
Headache	Mild to moderate	Common	Usually temporary
Flushing	Mild	Common	Especially after intake
Nasal congestion	Mild	Less common	Usually resolves itself

for erectile dysfunction (e.g., phosphodiesterase inhibitors), combined use should be approached with caution.

Active Ingredient	Dosage	Inactive Ingredients	Formulation Type
Sildenafil citrate	25 mg	Microcrystalline cellulose	Tablet
Sildenafil citrate	25 mg	Magnesium stearate	Chewable
Sildenafil citrate	25 mg	Hypromellose	Sublingual

Lorlatinib: (Moderate) Monitor for decreased efficacy of sildenafil if coadministration

What is Viagra used for?

Idelalisib: (Major) Coadministration of idelalisib is not recommended in patients receiving sildenafil for pulmonary arterial hypertension (PAH). When sildenafil is used for erectile dysfunction, consider a starting dose of 25 mg for patients receiving idelalisib. Imatinib: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with imatinib is necessary; a dose reduction of sildenafil may be necessary when prescribed for erectile dysfunction. Indinavir: (Major) Sildenafil is contraindicated for use with indinavir when used for pulmonary arterial hypertension (PAH). In a small pharmacokinetic study, the coadministration of a single dose of sildenafil (25 mg) to patients receiving indinavir (800 mg every 8 hours) resulted in markedly increased sildenafil AUC values (340% increase), as compared to historical controls.

When is the best time to take Viagra?

In two of the six subjects, prolonged clinical effects of sildenafil were noted for 72 hours after a single dose of sildenafil. Isavuconazonium: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with isavuconazonium is necessary; a dose reduction of sildenafil may be necessary when prescribed for erectile dysfunction. Isocarboxazid: (Moderate) Additive hypotensive effects may be seen when monoamine oxidase inhibitors (MAOIs) are combined with sildenafil. Careful monitoring of blood pressure is suggested during concurrent therapy of MAOIs with sildenafil. It can be expected that concomitant administration of CYP3A4 enzyme-inducers, such as rifampin, will decrease plasma levels of sildenafil, however, no interaction studies have been performed. with lorlatinib is necessary as concurrent use may decrease sildenafil exposure. Lumacaftor; Ivacaftor: (Moderate) Increased monitoring is recommended if ivacaftor is administered concurrently with CYP2C9 substrates, such as sildenafil.

• 25 mg Viagra may be recommended for men with mild to moderate ED.
• The medication’s effects typically last around 4-6 hours.
• Missing a dose is not typical since Viagra is used as needed.
• To maximize safety, inform your doctor of all health conditions.
• Patients should avoid grapefruit or grapefruit juice when taking Viagra.
• Ensure adequate hydration when using Viagra to prevent dehydration.
• Follow up with your doctor if Viagra doesn't produce expected results.

If concurrent use of lurasidone and antihypertensive agents is necessary, patients should be counseled on measures to prevent orthostatic hypotension, such as

How is Viagra used?

Glycerol Phenylbutyrate: (Moderate) Monitor for decreased efficacy of sildenafil if coadministration with glycerol phenylbutyrate is necessary as concurrent use may decrease sildenafil exposure. Grapefruit juice: (Moderate) Sildenafil is metabolized via the cytochrome CYP 3A4 isozyme. Grapefruit juice contains a compound that inhibits CYP3A4 in enterocytes in the GI tract. Sildenafil levels may increase; it is possible that sildenafil-induced side effects could also be increased in some individuals. One study has confirmed a potential interaction; sildenafil's AUC increased 23 percent with coadministration of grapefruit juice.

Can I take Viagra by snorting it?

Guaifenesin; Phenylephrine: (Minor) The therapeutic effect of phenylephrine injection may be decreased in patients receiving phosphodiesterase inhibitors. Hydantoins: (Moderate) Monitor for decreased efficacy of sildenafil if coadministration viagra vardenafil 20mg with phenytoin is necessary as concurrent use may decrease sildenafil exposure. Sildenafil is a sensitive CYP3A substrate and phenytoin is a strong CYP3A inducer. Consistent with their known effects on the nitric oxide/cGMP pathway, concomitant use of phosphodiesterase inhibitors and nitrates can cause severe hypotension, syncope, or myocardial infarction. Deaths have been reported in men who were using sildenafil while taking nitrate or nitrite therapy for angina. sitting on the edge of the bed for several minutes prior to standing in the morning and rising slowly from a seated position.

• The 25 mg strength provides a balance between efficacy and tolerability.
• It is not a stimulant and does not keep you awake.
• Can be part of a holistic approach including weight loss and stress management.
• Men with sickle cell anemia or multiple myeloma are at risk for priapism.
• The medication is classified as a vasodilator.
• Its effects can be potentiated by other vasodilators, including alcohol.
• A sudden severe headache could indicate a hypertensive crisis, especially with interactions.
• It is not intended for continuous use beyond daily dosing recommendations.
• The blue color of brand Viagra is due to the film coating, not the active drug.
• Men with bleeding disorders should be cautious due to theoretical bleeding risk.
• A positive attitude and reduced performance anxiety enhance treatment success.

Close monitoring of blood pressure is recommended until the full effects of the combination therapy are known.

Product Description

Sildenafil is a sensitive CYP3A4 substrate and oral lefamulin is a moderate CYP3A4 inhibitor; an interaction is not expected with intravenous lefamulin. Lenacapavir: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with lenacapavir is necessary; consider a starting dose of 25 mg of sildenafil when prescribed for erectile dysfunction. Sildenafil is a sensitive CYP3A substrate and lenacapavir is a moderate CYP3A inhibitor. In a drug interaction study, coadministration with a moderate CYP3A inhibitor increased the AUC of sildenafil by 182%. Lesinurad: (Moderate) Lesinurad may decrease the systemic exposure and therapeutic efficacy of sildenafil; monitor for potential reduction in efficacy.

Storage Requirements

Lesinurad; Allopurinol: (Moderate) Lesinurad may decrease the systemic exposure and therapeutic efficacy of sildenafil; monitor for potential reduction in efficacy. Letermovir: (Major) Monitor for an increase in sildenafil-related adverse reactions if coadministration with letermovir is necessary; a dose reduction of sildenafil may be necessary when prescribed for erectile dysfunction. Concurrent use is not recommended in patients receiving sildenafil for pulmonary arterial hypertension and taking cyclosporine, because the magnitude of the interaction may be amplified. Consider a starting dose of 25 mg of sildenafil for erectile dysfunction in patients receiving letermovir with cyclosporine. Letermovir is a moderate CYP3A4 inhibitor; however, when given with cialis or viagra for women cyclosporine, the combined effect on CYP3A4 substrates is similar to a strong CYP3A4 inhibitor. Mavacamten: (Moderate) Monitor for decreased efficacy of sildenafil if coadministration with mavacamten is necessary as concurrent use may decrease sildenafil exposure.

Other information about Viagra

Isoniazid, INH; Rifampin: (Minor) Sildenafil is metabolized principally by cytochrome P450 3A4 and 2C9 enzymes. Itraconazole: (Major) Avoid use of sildenafil for the treatment of pulmonary hypertension during and for 2 weeks after discontinuation of itraconazole treatment. When sildenafil is used for erectile dysfunction, consider a starting dose of 25 mg for patients receiving itraconazole. Ivacaftor: (Moderate) Increased monitoring is recommended if ivacaftor is administered concurrently with CYP2C9 substrates, such as sildenafil. Ivosidenib: (Moderate) Monitor for loss of efficacy of sildenafil during coadministration of ivosidenib; a sildenafil dose adjustment may be necessary.

Brand Names

Sildenafil is a sensitive substrate of CYP3A4; ivosidenib induces CYP3A4 and may lead to decreased sildenafil concentrations. Ketoconazole: (Major) Coadministration of ketoconazole is not recommended in patients receiving sildenafil for pulmonary arterial hypertension (PAH). When sildenafil is used for erectile dysfunction, consider a starting dose of 25 mg for patients receiving ketoconazole. Lansoprazole; Amoxicillin; Clarithromycin: (Major) Coadministration of clarithromycin is not recommended in patients receiving sildenafil for pulmonary arterial hypertension (PAH). Lefamulin: (Moderate) Monitor for an increase in sildenafil-related adverse reactions if coadministration with oral lefamulin is necessary; consider a starting dose of 25 mg of sildenafil when prescribed for erectile dysfunction.