Generic Viagra ( Sildenafil Citrate )

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Viagra (sildenafil citrate) is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED). It works by relaxing the smooth muscle in the walls of blood vessels and increasing blood flow to the penis during sexual stimulation, helping to achieve and maintain an erection. The standard, FDA‑approved doses are 25 mg, 50 mg, and 100 mg; strengths of 120 mg, 130 mg, 150 mg, and 200 mg are not approved by the FDA and are typically found in unregulated or counterfeit products that pose significant health risks.
Usual adult dose: The recommended starting dose is 50 mg taken as needed approximately 1 hour before sexual activity. Based on efficacy and tolerability, the dose may be increased to 100 mg or decreased to 25 mg. The maximum recommended dose is 100 mg once daily. Do not exceed 100 mg in a 24‑hour period, and never take more than one dose per day.
Dosage form: Film‑coated oral tablet.
Onset of action: Typically within 30‑60 minutes after oral administration; sexual stimulation is required for an erection to occur.
Duration of action: Approximately 4‑6 hours, although erections may occur multiple times during this window with continued arousal.
Alcohol consumption should be limited; excessive alcohol can reduce the ability to achieve an erection and may increase side effects such as dizziness, headache, and flushing.
Most common side effects: headache, facial flushing, indigestion, nasal congestion, dizziness, and visual disturbances (color tinge, blurred vision).
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General Information about Viagra

• INN (International Nonproprietary Name): Sildenafil citrate
• Brand names available in the USA: Viagra® (Pfizer Inc., originally discovered and marketed by Pfizer; now part of Viatris after the Upjohn merger). FDA‑approved generic sildenafil tablets are manufactured by numerous companies, including Teva Pharmaceuticals USA, Inc., Aurobindo Pharma USA, Inc., and others.
• ATC code: G04BE03
• Dosage forms and strengths: Film‑coated tablets: 25 mg, 50 mg, and 100 mg. Any strengths outside these (120 mg, 130 mg, 150 mg, 200 mg) are not FDA‑approved and are likely from unregulated sources.
• Manufacturers in USA: Pfizer Inc. (brand Viagra®); generic manufacturers include Teva Pharmaceuticals USA, Inc., Aurobindo Pharma USA, Inc., and many other FDA‑registered companies.
• Registration status in USA: Approved by the U.S. Food and Drug Administration (FDA) on March 27, 1998 (NDA 020895). Generic sildenafil was approved in 2017.
• OTC / Rx classification: Prescription only (Rx).

Mechanism of Action and Pharmacology

Sildenafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)‑specific phosphodiesterase type 5 (PDE5). During sexual stimulation, nitric oxide is released in the corpus cavernosum, activating the enzyme guanylate cyclase and increasing cGMP levels. Sildenafil enhances the effect of nitric oxide by inhibiting the degradation of cGMP by PDE5, leading to smooth muscle relaxation, vasodilation, and increased blood flow into the erectile tissue. Sildenafil has no direct relaxant effect on isolated human corpus cavernosum but requires sexual stimulation to be effective. It is about 4000‑fold more selective for PDE5 than for other PDE isoforms. After oral administration, sildenafil is rapidly absorbed, with peak plasma concentrations reached in 30‑120 minutes (median 60 minutes) under fasting conditions. A high‑fat meal slows absorption. Sildenafil is metabolized mainly by CYP3A4 and to a lesser extent CYP2C9, with an elimination half‑life of about 3‑5 hours. The active metabolite, N‑desmethyl sildenafil, contributes to the pharmacological effect. Excretion is primarily as metabolites in the feces and urine.

Indications

• Treatment of erectile dysfunction (ED) in adult men – the inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance.
• Sildenafil is also FDA‑approved (under the brand name Revatio) for the treatment of pulmonary arterial hypertension, but Viagra is indicated only for ED.

Important Warnings and Precautions

Viagra is contraindicated with any form of organic nitrate or nitric oxide donors (e.g., nitroglycerin, isosorbide mononitrate/dinitrate, recreational “poppers”) due to a profound and potentially fatal drop in blood pressure. Priapism (a painful erection lasting more than 4 hours) is a rare but serious adverse event that can cause permanent erectile dysfunction if not treated immediately. Non‑arteritic anterior ischemic optic neuropathy (NAION), a cause of sudden vision loss, has been reported rarely; patients with crowded optic discs are at increased risk. Sudden hearing loss may also occur. Caution is advised in patients with anatomical deformation of the penis, sickle cell anemia, multiple myeloma, or leukemia. Concomitant use of alpha‑blockers can cause symptomatic hypotension; start sildenafil at the lowest dose and separate administration times. The safety of sildenafil is unknown in patients with bleeding disorders or active peptic ulceration. Use with caution in patients with hepatic or severe renal impairment; dose adjustment is required. The maximum recommended dose is 100 mg; taking higher, non‑approved doses (120 mg, 130 mg, 150 mg, 200 mg) greatly increases the risk of severe side effects including priapism, severe hypotension, and visual/hearing loss, without proven additional benefit.

At‑risk groups

• Elderly: No dose adjustment is required based solely on age, but plasma levels of sildenafil are higher in healthy volunteers over 65 years. Initiate with the lowest effective dose.
• Pregnancy and breastfeeding: Sildenafil is not indicated for use in women. There are no adequate studies in pregnant women.
• Hepatic impairment: In mild to moderate impairment (Child‑Pugh A or B), start with 25 mg. In severe impairment (Child‑Pugh C), sildenafil has not been studied; use is not recommended.
• Renal impairment: For creatinine clearance 30‑50 mL/min, no dose adjustment is needed. For clearance
• Cardiovascular disease: Sexual activity carries a potential cardiac risk; patients should be evaluated for cardiovascular fitness before use. Sildenafil is contraindicated in patients with recent myocardial infarction (within 90 days), unstable angina, uncontrolled arrhythmias, hypotension (BP <90/50 mmHg), uncontrolled hypertension, or stroke within the last 6 months.
• Concomitant potent CYP3A4 inhibitors: Increase sildenafil exposure significantly; the maximum recommended dose is 25 mg when used with ritonavir, ketoconazole, itraconazole, or clarithromycin.

Driving and alcohol

Sildenafil may cause dizziness, visual disturbances, or drowsiness in some patients. If affected, driving or operating machinery should be avoided. Alcohol can increase the blood‑pressure‑lowering effects of sildenafil and exacerbate side effects such as headache, flushing, and dizziness. Moderate intake is generally acceptable, but heavy drinking should be avoided as it can impair the ability to achieve an erection.

Dosage Instructions

• Standard adult dosing for ED: The recommended starting dose is 50 mg taken as needed, approximately 1 hour before sexual activity. Based on efficacy and toleration, the dose may be increased to 100 mg or decreased to 25 mg. The maximum recommended dose is 100 mg once daily. Do not exceed one dose per day.
• Non‑standard, unapproved doses (120 mg, 130 mg, 150 mg, 200 mg): These strengths are not FDA‑approved. They are frequently found in counterfeit or illegally manufactured products sold online. These products have not been evaluated for safety, efficacy, or quality, and may contain incorrect amounts of sildenafil, harmful impurities, or other undeclared active ingredients. Consuming such high doses can lead to life‑threatening side effects including severe hypotension, prolonged erection (priapism), seizures, and cardiac arrest. Do not use these strengths.
• Administration: Swallow the tablet whole with a glass of water. It may be taken with or without food, but a heavy, high‑fat meal may delay the onset of action.
• Missed dose: Sildenafil is taken on an as‑needed basis; there is no scheduled dosing regimen. Do not take more than one dose per day.

Side Effects and Contraindications

Most common adverse reactions (incidence >2%): Headache (16%), flushing (10%), dyspepsia (7%), nasal congestion (4%), and dizziness (2%). Abnormal vision (color tinge, increased sensitivity to light, blurred vision) occurs in about 3% of patients, more frequently at the 100 mg dose.
Serious adverse reactions: Priapism, sudden vision loss (NAION), sudden hearing loss, severe hypotension, and serious cardiovascular events including myocardial infarction, stroke, and ventricular arrhythmia have been reported rarely but are temporally associated with sildenafil use. The causal relationship is unclear, as the underlying cardiovascular risk of ED patients is high. Seizure and seizure recurrence have also been reported.
Absolute contraindications: Concomitant use of organic nitrates in any form; known hypersensitivity to sildenafil or any component of the product; patients for whom sexual activity is inadvisable due to cardiovascular risk factors.

Drug Interactions

• Nitrates and nitric oxide donors: Profound, potentially life‑threatening hypotension; contraindicated.
• Alpha‑adrenergic blockers (e.g., doxazosin, tamsulosin): Additive blood‑pressure‑lowering effect; initiate sildenafil at the lowest dose and stabilize alpha‑blocker therapy first.
• Antihypertensives: Potentiation of blood‑pressure reduction; monitor closely.
• Potent CYP3A4 inhibitors (e.g., ritonavir, ketoconazole, itraconazole, clarithromycin): Significantly increase sildenafil exposure; the maximum recommended sildenafil dose is 25 mg, not higher doses.
• Moderate CYP3A4 inhibitors (e.g., erythromycin, fluconazole): May increase sildenafil levels; consider a lower starting dose.
• Grapefruit juice: May increase sildenafil plasma levels; avoid excessive consumption.
• Alcohol: May enhance the hypotensive effects and worsen side effects; limit intake.
• Other PDE5 inhibitors: Do not combine with sildenafil or any other PDE5 inhibitor.

Practical Advice

• Take Viagra approximately 1 hour before planned sexual activity. Sexual stimulation is necessary for an erection to occur.
• Do not exceed one 100 mg dose in 24 hours. Overdose increases the risk of serious side effects without improving efficacy.
• If an erection lasts longer than 4 hours (priapism), seek immediate medical attention to prevent permanent damage.
• Stop the medication and consult a doctor if you experience sudden vision or hearing loss.
• Only obtain sildenafil through a licensed U.S. pharmacy with a valid prescription. Avoid unregulated sources offering strengths higher than 100 mg, as these are not legitimate FDA‑approved products.
• Store at room temperature (15‑30 °C) in a dry place, away from direct sunlight. Keep out of reach of children.
• Regular follow‑up with a healthcare provider is recommended to monitor erectile dysfunction and cardiovascular health.

Alternative Medications

• Tadalafil (Cialis®): A longer‑acting PDE5 inhibitor with a duration of up to 36 hours. Available in on‑demand and daily dosing.
• Vardenafil (Levitra®, Staxyn®): Similar efficacy and duration to sildenafil; available as a tablet or orally disintegrating tablet.
• Avanafil (Stendra®): A fast‑onset PDE5 inhibitor that may take effect in as little as 15 minutes.
• Alprostadil: An injectable or intraurethral prostaglandin that directly causes erections; an option when oral PDE5 inhibitors fail or are contraindicated.

Clinical Efficacy

The efficacy and safety of sildenafil for erectile dysfunction were established in multiple double‑blind, placebo‑controlled trials of up to 6 months’ duration. In fixed‑dose studies, sildenafil 100 mg improved erections in 82% of men, compared with 24% on placebo. Successful intercourse rates were significantly higher with sildenafil than with placebo across a wide range of ED severities and etiologies. The drug is effective and safe when used at FDA‑approved doses, but no reliable clinical data support the use of doses exceeding 100 mg. Taking unapproved high‑dose products (120 mg, 130 mg, 150 mg, 200 mg) does not improve efficacy and exposes the user to an unacceptable risk of severe adverse events.

Important:

Viagra (sildenafil citrate) is a prescription medication that must be used under the supervision of a healthcare provider. Only the FDA‑approved strengths of 25 mg, 50 mg, and 100 mg should be used. Any product labeled 120 mg, 130 mg, 150 mg, or 200 mg is not FDA‑approved and is likely counterfeit, contaminated, or dangerously misdosed. Never purchase sildenafil from unverified online sources. This drug is contraindicated with any form of nitrate medication. Priapism, sudden vision loss, and sudden hearing loss are rare but serious side effects requiring emergency medical attention. Do not exceed 100 mg in a 24‑hour period. Alcohol should be limited. If you have heart disease, uncontrolled blood pressure, liver or kidney problems, or are taking other medications, consult a doctor before use. Keep out of reach of children. Seek immediate medical help for an erection lasting more than 4 hours or any severe allergic reaction.

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