Sildenafil (Sil…
Apo-sildenafil
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Viagra is a prescription-only medicine for the treatment of erectile dysfunction (ED) in adult men. It contains sildenafil citrate, a PDE5 inhibitor that increases blood flow to the penis to help maintain and achieve an erection during sexual activity. Viagra is FDA-approved for ED, available only with a valid prescription, and should be used under medical supervision. Many patients also explore cost-saving Canadian pharmacy options after receiving medical approval.
| Category | Details |
|---|---|
| Generic Name | Sildenafil citrate |
| Brand Name | Viagra |
| Drug Class | PDE5 inhibitor (phosphodiesterase‑5 inhibitor) |
| FDA‑Approved Use | Treatment of erectile dysfunction (ED) in men |
| Form(s) | Oral tablet |
| Strength(s) | 25 mg, 50 mg, 100 mg |
| Route of Administration | Oral |
| Prescription Required | Yes (Rx‑only) |
| Manufacturer(s) | Pfizer (Viagra). The generic sildenafil manufacturers may vary. |
| Viagra Warnings & Precautions | Risk of priapism, sudden vision/hearing loss, hypotension (especially with alpha‑blockers or antihypertensives), cardiovascular events in at‑risk patients |
| Common Side Effects | Headache, indigestion, flushing, nasal congestion, dizziness, visual changes |
| Serious Side Effects | Priapism, sudden vision loss (NAION), sudden hearing loss, severe hypotension, cardiovascular events |
| Storage | Store at 20–25°C (68–77°F); excursions permitted to 15°-30°C (59°-86°F) |
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Key benefits of Viagra include:
If you are using Viagra for erectile dysfunction (ED), follow these recommended administration guidelines:
Viagra (sildenafil) treats erectile dysfunction by improving blood flow to the penis during sexual stimulation. It works by blocking the PDE5 enzyme, which allows blood vessels to relax and widen. This increased blood flow helps men achieve and maintain a firm erection when sexually aroused. Viagra does not work without sexual stimulation and does not increase sexual desire.
Viagra may cause side effects, which are usually mild to moderate, but serious side effects can occur in some individuals. This is not a complete list of possible Viagra side effects. If you notice other adverse reactions during your treatment, report them immediately to your prescriber.
| Common Side Effects of Viagra | Serious / Rare Side Effects of Viagra |
|---|---|
| Headache | Sudden vision loss (rare, due to NAION) |
| Flushing (redness, warmth) | Sudden hearing decrease or loss |
| Indigestion (dyspepsia) | Priapism (prolonged erection >4 hours) |
| Nasal congestion | Severe hypotension (especially with nitrates) |
| Dizziness | Heart attack, stroke, arrhythmia (rare, in patients with cardiac risk) |
| Visual changes (blue/blurred vision, sensitivity to light) | Severe allergic reactions (rash, swelling, difficulty breathing) |
| Back pain or muscle aches | Seizures have been reported rarely in post-marketing experience |
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The Viagra dosage is individualized based on effectiveness, tolerability, and medical history.
Taking more Viagra than prescribed can increase the risk of serious side effects, including:
Priapism is a medical emergency and requires treatment to prevent permanent damage. If you suspect a Viagra overdose, seek urgent medical care or contact the poison control center immediately.
Viagra (sildenafil) is generally well tolerated when used as prescribed, but it may cause side effects or pose risks in certain individuals. Some risks may require dose adjustment, monitoring, or avoidance of use altogether.
Viagra's potential risks include:
Before using Viagra (sildenafil), inform your healthcare provider if you have or have had:
Viagra should be used only under medical supervision, especially in patients with underlying cardiovascular conditions.
Viagra should not be used by individuals who:
Viagra is not approved for use in women or children.
Viagra (sildenafil) can interact with certain medications. You should always inform your healthcare provider about all prescription medicines, OTC drugs, and supplements you are taking before using Viagra.
| Drug Class | Drug Examples | Interaction Concern |
|---|---|---|
| Nitrates | Nitroglycerin, isosorbide dinitrate, isosorbide mononitrate | Severe, potentially life‑threatening drop in blood pressure |
| Guanylate cyclase stimulators | Riociguat | Contraindicated due to the risk of dangerous hypotension |
| Alpha‑blockers | Doxazosin, tamsulosin | Increased risk of symptomatic hypotension (dizziness, fainting) |
| Other PDE5 inhibitors | Tadalafil, vardenafil, avanafil | No added benefit and higher risk of side effects |
| Certain antihypertensive drugs | Beta‑blockers, calcium channel blockers | May enhance blood‑pressure‑lowering effects, especially when combined with other vasodilators |
| Strong CYP3A4 inhibitors | Ketoconazole, ritonavir, clarithromycin | Can increase sildenafil levels, raising the risk of adverse effects |
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If Viagra (sildenafil citrate) is unsuitable or unavailable, the following alternatives may be considered after consulting a medical provider:
Viagra and sildenafil contain the same active ingredient (sildenafil citrate), work in the same way, and provide the same clinical benefits for erectile dysfunction. The primary difference is that Viagra is the brand-name medication, while sildenafil is the FDA-approved generic equivalent. Below is a comparison table outlining the key details:
| Feature | Viagra (Brand Name) | Sildenafil (Generic) |
|---|---|---|
| Active Ingredient | Sildenafil citrate | Sildenafil citrate |
| Indication | Treatment of erectile dysfunction (ED) | Treatment of erectile dysfunction (ED) |
| Available Strengths (ED) | 25 mg, 50 mg, 100 mg | 25 mg, 50 mg, 100 mg |
| How It Works | A PDE5 inhibitor that increases blood flow to the penis during sexual stimulation | Same mechanism (PDE5 inhibitor) |
| Dosing | Taken as needed, about 1 hour before sexual activity | Same dosing recommendations |
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At Polar Bear Meds, we help make Viagra more affordable without compromising on quality. By partnering with licensed Canadian pharmacies, we offer Viagra at prices often up to 80% lower than those of typical U.S. pharmacies.
New customers may save even more by using the Viagra coupon code “WELCOMEPB10” for an extra 10% off. No insurance is required, and there are no hidden fees. All orders are shipped fast and discreetly, typically within 3–5 business days via Xpress Post, making it simple and reliable to start your treatment.
This information is for educational purposes only and should not substitute for medical advice, diagnosis, or treatment. Viagra is a prescription medicine and should be taken only as directed by your prescriber. This is particularly important if you have underlying health conditions or are using other medicines.
Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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