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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
In 1864, the first barbiturate (barbituric acid) was synthesized.