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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Territory sizes differ among animals. Territory sizes differ among animals.
The most polygynous primates live in groups with many more females than males. The most polygynous primates live in groups with many more females than males.
Hydrogen burns to produce energy and water Hydrogen burns to produce energy and water
Comparison of the Duration of Meiosis in Males and Females Comparison of the Duration of Meiosis in Males and Females
Bug depositing fertilized eggs on a pine needle Bug depositing fertilized eggs on a pine needle
Floral components. Anthers produce pollen and ovules produce eggs. Floral components. Anthers produce pollen and ovules produce eggs.
Video: Hormones and the menstrual cycle Animation

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