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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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