A drug is any chemical you take that effects the way your body works. Alcohol, caffeine, aspirin and nicotine are al drugs. A drug must be able to pass from you body into your brain. Once inside your brain, drugs can chance the messages you brain cells are sending to each other, and to the rest of your body. They do this by interfering with your brain’s own chemical signal: neurotransmitters that transfer signals across synapses Heroin is an opiate processed directly from the extracts of the opium poppy. It was originally created to help cure people of addiction to morphine. Upon crossing the blood-brain barrier, which occurs soon after introduction of the drug into the bloodstream, heroin is converted into morphine, which mimics the action of endorphins, creating a sense of well-being; the characteristic euphoria has been described as an “orgasm” centered in the gut. One of the most common methods of heroin use is via intravenous injection.
Cocaine is a crystalline tropane alkaloid that is obtained from the leaves of the coca plant. It is both a stimulant of the central nervous system and an appetite suppressant, giving rise to what has been described as a euphoric sense of happiness and increased energy. It is most often used recreationally for this effect. Cocaine is a potent central nervous system stimulant.
Methamphetamime, popularly shortened to meth or ice, is a psychostimulant and sympathomimetic drug. Methamphetamine enters the brain and triggers a cascading release of norepinephrine, dopamine and serotonin. Since it stimulates the mesolimbic reward pathway, causing euphoria and excitement, it is prone to abuse and addiction. Users may become obsessed or perform repetitive tasks such as cleaning, hand-washing, or assembling and disassembling objects. Withdrawal is characterized by excessive sleeping, eating and depression-like symptoms, often accompanied by anxiety and drug-craving.
Crack cocaine, often nicknamed “crack”, is believed to...