Warnings
Some medicines can cause unwanted or dangerous effects when used with
sildenafil. Tell your doctor about all your current medicines, especially riociguat
(Adempas) and nitrates.
Do not take Viagra if you are also using a nitrate drug for chest pain or heart
problems, including nitroglycerin, isosorbide dinitrate, isosorbide mononitrate,
and some recreational drugs such as "poppers". Taking sildenafil with a nitrate
medicine can cause a sudden and serious decrease in blood pressure.
Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.
Stop using Viagra and get emergency medical help if you have sudden vision loss.

Before taking this medicine
You should not use sildenafil if you are allergic to sildenafil, or:
 if you take other medicines to treat pulmonary arterial hypertension, such
as riociguat (Adempas).
 if you take nitrates.

Do not take Viagra if you are 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 sildenafil with a nitrate medicine can
cause a sudden and serious decrease in blood pressure.
To make sure sildenafil is safe for you, tell your doctor if you have ever had:
 heart disease or heart rhythm problems, coronary artery disease;
 a heart attack, stroke, or congestive heart failure;
 high or low blood pressure;
 liver or kidney disease;
 a blood cell disorder such as sickle cell anemia, multiple myeloma, or
leukemia;
 a bleeding disorder such as hemophilia;
 a stomach ulcer;
 retinitis pigmentosa (an inherited condition of the eye);
 a physical deformity of the penis (such as Peyronie's disease); or
 if you have been told you should not have sexual intercourse for health reasons.
Sildenafil can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking sildenafil, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoked or were over 50 years old. It is not clear whether sildenafil is the actual cause of vision loss.
Do not give this medicine to anyone under 18 years old without medical advice.

How should I take sildenafil?
Take sildenafil exactly as it was prescribed for you. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
sildenafil is usually taken only when needed, 30 minutes to 1 hour before sexual activity.

You may take it up to 4 hours before sexual activity. Do not take
sildenafil more than once per day.
Sildenafil can help you have an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. Follow your doctors 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 doctor right away. You could be having a serious side effect of sildenafil.
Store at room temperature away from moisture and heat.

What happens if I miss a dose?
Since sildenafil is used as needed, you are not likely to miss a dose.

What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222- 1222.

What to avoid
Drinking alcohol with this medicine can cause side effects.
Grapefruit and grapefruit juice may interact with sildenafil and lead to unwanted
side effects. Avoid the use of grapefruit products while taking sildenafil.
Avoid using any other medicines to treat impotence, such as alprostadil or yohimbine, without first talking to your doctor.

Viagra side effects
Get emergency medical help if you have signs of an allergic reaction to sildenafil: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop taking sildenafil and get emergency medical help if you have:
 heart attack symptoms--chest pain or pressure, pain spreading to your jaw
or shoulder, nausea, sweating;
 vision changes or sudden vision loss; or

I’m a Return and Refund policy. I’m a great place to let your customers know what to do in case they are dissatisfied with their purchase. Having a straightforward refund or exchange policy is a great way to build trust and reassure your customers that they can buy with confidence.