Schering Plough corporation are a pharmaceutical company. They produce drugs to combat allergies with the most well known drugs they produce being Claritin and Clarinex.
They include anesthetics and analgesic drugs.
antipsychotic drugs
drugs tobacco
Don't do drugs.
Drugs can definitely be incredibly dangerous. These drugs are body altering substances that the body does not typically naturally produce.
recombinant technology
neurotransmitters
Ectacy
Crops that people can use to produce drugs
Marijuana
Pretty much all drugs create some kind of euphoria or another, that is why people take them.