Common use
Viagra is the world's most recognized medication for the treatment of erectile dysfunction (ED), containing the active ingredient sildenafil citrate — a powerful and clinically proven PDE5 inhibitor. Since its introduction, Viagra has helped millions of men worldwide restore their sexual health and regain confidence in their intimate relationships.

Sildenafil citrate works by enhancing the body's natural response to sexual stimulation. It promotes smooth muscle relaxation through the increased activity of nitric oxide — a chemical naturally released in the penis during sexual arousal. This smooth muscle relaxation allows significantly increased blood flow into the corpus cavernosum, producing a firm, reliable erection suitable for satisfying sexual intercourse. As a PDE5 inhibitor, sildenafil specifically blocks the enzyme phosphodiesterase type 5, which is responsible for the premature breakdown of cGMP — the molecule that sustains erection-quality blood flow.

Sildenafil citrate is prescribed for the treatment of erectile dysfunction (impotence) in men of various ages and is also approved for pulmonary arterial hypertension. When you buy Viagra online from a trusted pharmacy, you gain access to the gold-standard impotence treatment that has set the benchmark for all ED medications. Viagra generic sildenafil is now also available, offering the same proven formula for male enhancement at a more affordable price point. Sildenafil may also be used for additional medical purposes as determined by your healthcare provider.



Dosage and direction
The recommended starting dose of Viagra is 50 mg, taken approximately 30 to 60 minutes before planned sexual activity. Based on individual effectiveness and tolerability, your doctor may adjust the dose to 25 mg or 100 mg. Do not take Viagra more than once per day, and do not exceed the dose prescribed by your physician.

A high-fat meal may significantly delay the onset of action of this ED treatment, so taking sildenafil on an empty stomach or after a light meal is recommended for optimal results. Avoid consuming grapefruit or grapefruit juice while using Viagra, as grapefruit can increase blood levels of sildenafil and raise the risk of side effects. Remember that sexual stimulation is required for this medication to work — buy sildenafil with the understanding that it enhances the natural erectile response rather than creating spontaneous erections.



Precautions
Before you buy Viagra online or begin treatment, tell your doctor or pharmacist if you are allergic to sildenafil citrate or have any other known allergies. Provide a complete medical history, particularly regarding cardiovascular conditions, as men with serious heart disease should discuss whether sexual activity is safe for them.

Elderly patients may be more sensitive to the effects of sildenafil and may benefit from starting at a lower dose of 25 mg. Patients with liver or kidney impairment may also require dosage adjustment. Inform your healthcare provider about all medical conditions and medications before starting this PDE5 inhibitor for sexual health improvement.



Contraindications
Viagra is strictly contraindicated in patients currently taking any nitrate medication for chest pain or heart conditions, as the combination can produce a sudden, severe, and potentially fatal drop in blood pressure. It must not be used alongside other medications prescribed for the treatment of impotence or erectile dysfunction.

This medicine is not intended for use by women or children and should not be taken by individuals with a known hypersensitivity to sildenafil or any component of the tablet. Patients with recent heart attack, stroke, or life-threatening arrhythmia should consult their physician before considering this impotence treatment.



Possible side effect
The most commonly reported side effects of Viagra include headache, facial flushing, heartburn, stomach upset, nasal stuffiness or congestion, lightheadedness, dizziness, and diarrhea. These effects are usually mild and temporary, resolving on their own within a few hours.

Serious allergic reactions to sildenafil are very rare; however, seek immediate medical help if you experience severe symptoms such as rash, swelling, or difficulty breathing. If you experience an erection lasting longer than 4 hours (priapism), contact emergency medical services immediately, as untreated priapism can cause permanent penile damage. Temporary visual changes, including altered color perception, may also occur in some patients.

The majority of men who buy Viagra online and use it as directed experience no serious side effects. If you notice any symptoms not listed above, contact your doctor or pharmacist for evaluation.



Drug interaction
Viagra must not be used with nitrate-containing medications or recreational drugs known as "poppers" (containing amyl or butyl nitrite), as this can cause a dangerous, life-threatening drop in blood pressure. Other significant interactions include alpha-blocker medications, other ED treatment drugs, and certain antihypertensive medicines.

Consult your doctor or pharmacist for a complete evaluation of potential drug interactions before starting sildenafil. Providing a full list of all medications — including prescription drugs, over-the-counter products, and herbal supplements — is essential for your safety.



Missed dose
Viagra is taken only as needed before sexual activity, so there is no regular dosing schedule. Simply take it when you plan to engage in sexual intercourse, and do not take more than one dose in a 24-hour period.



Overdose
If you suspect you have taken too much Viagra, seek emergency medical attention immediately. Symptoms of sildenafil overdose typically include chest pain, nausea, irregular heartbeat, lightheadedness, and fainting. Prompt medical treatment is essential.



Storage
Store Viagra at room temperature between 68-77 degrees F (20-25 degrees C), away from direct light and moisture. Do not store this medication in the bathroom. Keep all medications out of reach of children and pets.



Disclaimer
We provide only general information about medications which does not cover all directions, possible drug integrations, or precautions. Information at the site cannot be used for self-treatment and self-diagnosis. Any specific instructions for a particular patient should be agreed with your health care adviser or doctor in charge of the case. We disclaim reliability of this information and mistakes it could contain. We are not responsible for any direct, indirect, special or other indirect damage as a result of any use of the information on this site and also for consequences of self-treatment.