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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
![Sublingual medication administration. Photograph of a male patient placing a nitroglycerine tablet u](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_14_17_81762125.jpeg)
![Subcutaneous drug administration: (d) the needle is removed and the puncture site is covered with an](https://biology-forums.com/gallery/47/medium_46687_08_12_14_5_01_53_19533653.jpeg)