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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The human body produces and destroys 15 million blood cells every second.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Pattern baldness
Radial pattern of shoot growth in plants
Typical secondary ignition pattern. Note the lack of firing lines on superimposed pattern.
Electrophoresis gel in a densitometer. SPE densitometry showing a normal pattern.
Typical pattern of the stages of labour for first births and subsequent births