If you wanted to learn how to make drugs, you would study pharmacology.
Drugs are produced by a pharmaceutical company which uses laboratories to develop the medication.
Hallucinogens are naturally-occurring or synthetically-produced drugs that can cause hallucinations
Histamine
would this be use in the process of opiates.
ceiling fan meth used to cause cancer
No. That would not be a side effect.
amphetamine(s), (originally amphetamines were produced from the leaves of Euphedra and Khat plants). From 1930's it is produced synthetically. Legal drugs may include acetylsalycylic acid (aspirin of Bayer), acetaminophen (paracetamol), and amidophen (reduces fever)
Bristol-Myers Squibb are the makers of prescription drugs that are used by millions everyday. Some of the prescription drugs they make are Abilify, Kenelog which is a steroid and Plavix.
Some compounds produced by bacteria and fungi are capable of killing, or inhibiting, competing microbial species, which led to the production of "lifesaving drugs".
A variety of psychoactive drugs have notable effects on awareness. These range from a simple dulling of awareness produced by sedatives, to increases in the intensity of sensory qualities produced by stimulants:caffeine, cannabis, or most notably by the class of drugs known as psychedelics. These can produce major distortions of perception, including hallucinations. There is substantial evidence that alterations in the brain system that uses the chemical neurotransmitter serotonin play an essential role.
http://wiki.answers.com/Q/There_are_how_many_major_neurotransmitters_that_appear_to_account_for_most_of_the_effects_produced_by_the_action_of_drugs_of_abuse_on_the_brain"
Because Mexico is a natural port of entry into the US market. See, most drugs that are produced or pass through Mexico don't stay in Mexico; they are for American drug addicts.