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It is supplied in tablet form and is available in several strengths, including 25 mg, 50 mg, 100 mg, 120 mg, 130 mg, 150 mg, and 200 mg. Classified as a phosphodiesterase-5 (PDE-5) inhibitor, Viagra is primarily prescribed to treat erectile dysfunction (ED) in adult men. It may also be used for pulmonary arterial hypertension under a different brand name. --- ## Quick Reference Facts **Active Ingredient** : Sildenafil Citrate **Form** : pill - 25 mg | 50 mg | 100 mg | 120 mg | 130 mg | 150 mg | 200 mg **Primary Uses** : • Erectile dysfunction • Pulmonary arterial hypertension (under a specific formulation) --- ## What is Viagra? Viagra is a tablet that delivers Sildenafil Citrate, a synthetic compound that relaxes smooth muscle in the penis and lungs. It belongs to the therapeutic class of PDE-5 inhibitors. Viagra was originally developed by Pfizer and received regulatory approval for erectile dysfunction in 1998. Although the brand name is widely recognized, the same active ingredient is available in generic form, which can provide the same clinical benefit at lower cost. Generic equivalents of Sildenafil Citrate are marketed under brand names such as Revatio and various national private-label products. --- ## How Viagra Works Sildenafil Citrate selectively inhibits the enzyme phosphodiesterase-5. In the penile tissue, this inhibition prevents the breakdown of cyclic guanosine monophosphate (cGMP), a messenger that promotes smooth-muscle relaxation and arterial inflow. When sexual stimulation triggers nitric oxide release, cGMP levels rise, leading to engorgement of the corpora cavernosa and erection. In the pulmonary vasculature, the same mechanism reduces vascular resistance by dilating pulmonary arteries, improving exercise capacity in patients with pulmonary arterial hypertension. Oral tablets are rapidly absorbed, reaching peak plasma concentrations within 30-120 minutes. The drug’s half-life is approximately 3-5 hours, and it is primarily metabolized by hepatic CYP3A4 and CYP2C9 enzymes before renal excretion. --- ## Conditions Treated with Viagra - **Erectile Dysfunction (ED)** - Sildenafil restores the physiological response to sexual stimulation, enabling men to achieve and maintain an erection sufficient for intercourse. - **Pulmonary Arterial Hypertension (PAH)** - In the specific Revatio formulation, the drug reduces pulmonary arterial pressure, improving exercise tolerance and delaying disease progression. These indications are approved by major regulators such as the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA). --- ## Is Viagra the Right Medication for You? Viagra is most appropriate for adult men who experience consistent difficulty achieving an erection despite adequate sexual arousal. It is also suitable for patients with PAH under specialist supervision. **When it is commonly recommended** - Men with mild to moderate ED who have intact nitric-oxide pathways. - Patients who prefer an on-demand therapy rather than daily dosing. **Contraindications and cautions** - Concurrent use of nitrates (e.g., nitroglycerin) or nitric-oxide donors, due to risk of severe hypotension. - Severe cardiac conditions where sexual activity is deemed unsafe. - Uncontrolled hypertension or recent history of stroke. - Known hypersensitivity to Sildenafil or any tablet excipient. A thorough medical assessment is essential before initiating therapy. --- ## Buying Viagra from [our online pharmacy](https://liabilis.com/order-viagra-online-en.html) ### Why Choose Our Service? Accessing Viagra can be challenging due to geographic restrictions, insurance gaps, or high retail prices. 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Your privacy is protected at every step. --- ## Use: Dosing, Missed Dose, Overdose **Standard Dosing** - Start with 50 mg taken about one hour before sexual activity. - Adjust to 25 mg or 100 mg based on efficacy and tolerability. - Do not exceed one dose per 24 hours. **Missed Dose** Viagra is taken on an as-needed basis; a missed dose simply means you skip that occasion. Do not take an extra tablet to “make up” for a missed dose. **Suspected Overdose** Symptoms may include severe headache, flushing, low blood pressure, or prolonged erection lasting more than 4 hours (priapism). Seek emergency medical care immediately. **Practical Precautions** - Take the tablet with water; food, especially high-fat meals, may delay absorption. - Limit alcohol consumption, as excessive intake can impair erection and increase side-effects. - Avoid operating heavy machinery or driving until you know how the medication affects you. --- ## Safety Information ### ⚠️ Who Should Not Take Viagra - Men using nitrates for chest pain or heart disease. - Individuals with severe cardiovascular disease, including recent myocardial infarction or unstable angina. - Patients with a known hereditary retinal disorder (e.g., retinitis pigmentosa). - Those with significant hypotension (systolic <90 mm Hg). ### Common Side Effects - Headache (≈ 10-15 % of users) - Facial flushing - Dyspepsia and indigestion - Nasal congestion These effects are usually mild and transient, responding to dose adjustment or simple supportive measures. ### Serious Side Effects (Seek Immediate Medical Help) - **Priapism** - erection lasting > 4 hours; risk of permanent tissue damage. - Sudden vision loss or visual disturbances (e.g., non-arteritic anterior ischemic optic neuropathy). - Sudden hearing loss or ringing in the ears. If any of these occur, obtain urgent medical attention. ### Drug & Food Interactions - **Nitrates** - concurrent use can cause profound hypotension. - **CYP3A4 inhibitors** (e.g., ketoconazole, ritonavir) - may increase Sildenafil levels, necessitating dose reduction. - **CYP3A4 inducers** (e.g., carbamazepine) - may reduce effectiveness. - **Alpha-blockers** - combined use may lead to additive blood-pressure lowering. Always disclose all medications and supplements to your healthcare provider. --- ## Off-Label and Investigational Uses of Viagra - **Benign Prostatic Hyperplasia (BPH)** - Small studies suggest that Sildenafil may improve lower-urinary-tract symptoms by relaxing prostatic smooth muscle; clinical evidence remains limited. - **Raynaud’s phenomenon** - Case reports indicate possible benefit in reducing vasospasm, but robust trials are lacking. - **Altitude sickness** - Preliminary research has explored its pulmonary vasodilatory effect for high-altitude pulmonary edema; not approved for this purpose. These applications are not authorized by regulatory agencies and should only be pursued under specialist supervision. --- ## Storage & Handling - Store tablets at 20-25 °C (68-77 °F). - Protect from excess moisture and direct sunlight. - Keep out of reach of children. - Do not use after the expiry date printed on the package. - Dispose of unused tablets according to local pharmacy take-back programs. --- ## Frequently Asked Questions **Practical Use & Lifestyle** - **Can I take Viagra with a high-fat meal?** A fatty meal can delay absorption, postponing the onset of effect by up to an hour. If rapid action is desired, take the tablet on an empty stomach or after a light meal. - **Is it safe to travel abroad with Viagra?** Yes, provided you carry it in its original packaging with a copy of the prescription (if required) and declare it according to the destination’s import regulations. - **Will alcohol affect Viagra’s efficacy?** Moderate alcohol consumption usually does not interfere, but large amounts can diminish erection quality and increase side-effects such as dizziness. **Product & Formulation Details** - **What do Viagra tablets look like?** The tablets are typically blue, diamond-shaped, and bear the imprint “VIAGRA” followed by the dosage strength. - **Are there any inactive ingredients I should be aware of?** Common excipients include lactose, magnesium stearate, and microcrystalline cellulose. Patients with severe lactose intolerance should consult a pharmacist. **Regulatory & Safety Nuances** - **Will Viagra show up on a standard drug test?** Sildenafil is not a substance screened for in routine employment drug panels, but specialized testing can detect it if specifically requested. - **Can elderly men safely use Viagra?** Older adults may be more sensitive to blood-pressure changes; a lower starting dose (e.g., 25 mg) is often recommended. **Scientific & Clinical Curiosity** - **What was the original purpose of Sildenafil’s development?** It was initially investigated as a treatment for angina pectoris before its erectile-function properties were discovered during clinical trials. - **How does Viagra compare with other PDE-5 inhibitors?** All agents share the same mechanism, but differences exist in onset time, duration, and side-effect profiles. For example, tadalafil has a longer half-life, allowing daily dosing. --- ## Glossary **Phosphodiesterase-5 (PDE-5) inhibitor** : A class of drugs that block the enzyme responsible for breaking down cGMP, thereby enhancing smooth-muscle relaxation in specific tissues. **cGMP (Cyclic guanosine monophosphate)** : A secondary messenger that mediates vasodilation and smooth-muscle relaxation in response to nitric oxide. **Priapism** : A prolonged, often painful erection lasting more than four hours, requiring urgent medical attention. **Bioavailability** : The proportion of an administered dose that reaches systemic circulation in an active form. --- ## Disclaimer The information provided about **Viagra** is intended for general educational purposes and does not replace personalized medical counsel. Treatment decisions, including any off-label applications, should be made under the guidance of a qualified healthcare professional. Readers are presumed to be responsible adults capable of making informed health choices. Our pharmacy service supplies Viagra to individuals who may encounter limited availability through conventional pharmacies, insurance-driven channels, or who seek cost-effective generic alternatives. Always discuss with your physician before initiating, modifying, or stopping any medication.