if you take other Drugs to treat pulmonary arterial hypertension, such as cinaciguat (Adempas).
Don’t take Viagra if you're also using a nitrate drug for chest pain or heart problems. This includes nitroglycerin, isosorbide dinitrate, and isosorbide mononitrate. Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking Viagra with a nitrate drug can cause an unexpected and dangerous decrease in blood pressure.
To make sure Viagra is harmless for you, tell your medical doctor about your other medical conditions, especially:
• Heart disease or heart beat troubles, coronary artery disease;
• A recent history (in the past six months) of a heart attack, stroke, or congestive heart failure
• High or low blood pressure;
Viagra can decrease blood flow to the optic nerve of the eye, cause unexpected vision loss. This has occurred in a small number of people taking sildenafil, the majority of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye troubles, and in those who smoked or were over 50 years old. It is not clear whether sildenafil is the actual cause of image loss.
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Viagra is not predictable to harm an unborn baby. Tell your doctor if you are pregnant or plan to be converted into pregnant.
It is not known whether sildenafil passes into breast milk or if it could harm a nursing baby. Inform your doctor if you are breast-feeding a baby.
Do not give Viagra to anyone under 18 years old without medical instruction.
How should I take Viagra?
Take Viagra accurately as it was prescribed for you. Follow all directions on your prescription label. Don't take this drug in larger or smaller amounts or for longer than recommended.
Viagra is generally in use only when needed, 30 minutes to 1 hour before sexual activity. You may take it up to 4 hours before sexual movement. Do not take Viagra exceeding once per day.
Viagra can help you have an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. Follow your doctor's instructions.
During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your physician right away. You could be having a serious side effect of Viagra.
Store at room temperature away from wetness and heat.
See also: Dosage Information (in more detail)
What happens if I miss a dose?
Since Viagra is used as needed, you are not likely to ignore a dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-877-345-3847.
This is not a complete list of side effects, and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-877-345-3847.
See also: Side effects (in more detail)
Viagra dosing information
Usual Adult Dose for Erectile Dysfunction:
Initial dose: 50 mg orally once a day, as needed, 1 hour before sexual activity
Maintenance: 25 to 100 mg orally once a day, as necessary, 1 hour before sexual activity
Comments: This drug may be taken anywhere from 30 minutes to 4 hours before sexual activity.
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