Cocaine is a crystalline tropane alkaloid that is obtained from the leaves of the coca plant. The name comes from "coca" in addition to the alkaloid suffix -ine, forming cocaine. It is both a stimulant of the central nervous system and an appetite suppressant.

Because of the way it affects the mesolimbic reward pathway, cocaine is addictive
Its possession, cultivation, and distribution are illegal for non-medicinal and non-government sanctioned purposes in virtually all parts of the world. Although its free commercialization is illegal and has been severely penalized in virtually all countries, its use worldwide remains widespread in many social, cultural, and personal settings.
In 1879 cocaine began to be used to treat morphine addiction, but by the turn of the twentieth century, the addictive properties of cocaine had become clear, and the problem of cocaine abuse began to capture public attention in the United States.
Cocaine was not considered a controlled substance until 1970, when the United States listed it as such in the Controlled Substances Act. Until that point, the use of cocaine was open and rarely prosecuted in the US due to the moral and physical debates commonly discussed.
In many countries, cocaine is a popular recreational drug. In the United States, the development of "crack" cocaine introduced the substance to a generally poorer inner-city market.
Cocaine use is prevalent across all socioeconomic strata, including age, demographics, economic, social, political, religious, and livelihood.
Cocaine’s status as a club drug shows its immense popularity among the “party crowd”.

Cocaine in its purest form is a white, pearly product.
Adulterated cocaine is often a white, off-white or pinkish powder.
The color of “crack” cocaine depends upon several factors including the origin of the cocaine used, the method of preparation – with ammonia or baking soda – and the presence of impurities, but will generally range from white to a yellowish cream to a light brown.
Its texture will also depend on the adulterants, origin and processing of the powdered cocaine, and the method of converting the base. It ranges from a crumbly texture, sometimes extremely oily, to a hard, almost crystalline nature.

Street Names
Coke, crack, snow, rock blow, nose candy, angie, barbs, big c, bolivian marching powder, came, duct, foo foo, icing.

Routes of administration

Many users rub the powder along the gum line, or onto a cigarette filter which is then smoked, which numbs the gums and teeth - hence the colloquial names of "numbies", "gummers" or "cocoa puffs" for this type of administration. This is mostly done with the small amounts of cocaine remaining on a surface after insufflation. Another oral method is to wrap up some cocaine in rolling paper and swallow it. This is sometimes called a "snow bomb."
Rolled up banknotes, hollowed-out pens, cut straws, pointed ends of keys, specialized spoons, long fingernails, and (clean) tampon applicators are often used to insufflate cocaine. Such devices are often called "tooters" by users. The cocaine typically is poured onto a flat, hard surface (such as a mirror, CD case or book) and divided into "bumps", "lines" or "rails", and then insufflated. As tolerance builds rapidly in the short-term (hours), many lines are often snorted to produce greater effects.

Coca leaf:
Coca leaves are typically mixed with an alkaline substance (such as lime) and chewed into a wad that is retained in the mouth between gum and cheek (much in the same as chewing tobacco is chewed) and sucked of its juices. The juices are absorbed slowly by the mucous membrane of the inner cheek and by the gastrointestinal tract when swallowed.

Insufflation (known colloquially as "snorting," "sniffing," or "blowing") is the most common method of ingestion of recreational powdered cocaine in the Western world. The drug coats and is absorbed through the mucous membranes lining the sinuses. When insufflating cocaine, absorption through the nasal membranes is approximately 30–60%, with higher doses leading to increased absorption efficiency. Any material not directly absorbed through the mucous membranes is collected in mucus and swallowed (this "drip" is considered pleasant by some and unpleasant by others).
In a study of cocaine users, the average time taken to reach peak subjective effects was 14.6 minutes. Any damage to the inside of the nose is because cocaine highly constricts blood vessels – and therefore blood and oxygen/nutrient flow – to that area.

Drug injection provides the highest blood levels of drug in the shortest amount of time. Subjective effects not commonly shared with other methods of administration include a ringing in the ears moments after injection (usually when in excess of 120 milligrams) lasting 2 to 5 minutes including tinnitus & audio distortion. This is colloquially referred to as a "bell ringer".
In a study of cocaine users, the average time taken to reach peak subjective effects was 3.1 minutes. The euphoria passes quickly. Aside from the toxic effects of cocaine, there is also danger of circulatory emboli from the insoluble substances that may be used to cut the drug.
As with all injected illicit substances, there is a risk of the user contracting blood-borne infections if sterile injecting equipment is not available or used.
An injected mixture of cocaine and heroin, known as “speedball” is a particularly popular and dangerous combination, as the converse effects of the drugs actually complement each other, but may also mask the symptoms of an overdose.

Inhalation or smoking is one of the several means cocaine is administered. Cocaine is smoked by inhaling the vapor by sublimating solid cocaine by heating.
In a 2000 Brookhaven National Laboratory medical department study, based on self reports of 32 abusers who participated in the study, "peak high" was found at mean of 1.4min +/- 0.5 minutes.
Smoking freebase or crack cocaine is most often accomplished using a pipe made from a small glass tube, often taken from "Love roses," small glass tubes with a paper rose that are promoted as romantic gifts. These are sometimes called "stems", "horns", "blasters" and "straight shooters".
A small piece of clean heavy copper or occasionally stainless steel scouring pad – often called a "brillo" (actual Brillo pads contain soap, and are not used), or "chore", named for Chore Boy brand copper scouring pads, – serves as a reduction base and flow modulator in which the "rock" can be melted and boiled to vapor. Crack smokers also sometimes smoke through a soda can with small holes in the bottom.
Crack is smoked by placing it at the end of the pipe; a flame held close to it produces vapor, which is then inhaled by the smoker. The effects, felt almost immediately after smoking, are very intense and do not last long – usually five to fifteen minutes.
When smoked, cocaine is sometimes combined with other drugs, such as cannabis, often rolled into a joint or blunt. Powdered cocaine is also sometimes smoked, though heat destroys much of the chemical; smokers often sprinkle it on marijuana.

Orally administered cocaine takes approximately 30 minutes to enter the bloodstream. Typically, only a third of an oral dose is absorbed, although absorption has been shown to reach 60% in controlled settings.
Given the slow rate of absorption, maximum physiological and psychotropic effects are attained approximately 60 minutes after cocaine is administered by ingestion. While the onset of these effects is slow, the effects are sustained for approximately 60 minutes after their peak is attained.
Contrary to popular belief, both ingestion and insufflation result in approximately the same proportion of the drug being absorbed: 30 to 60%. Compared to ingestion, the faster absorption of insufflated cocaine results in quicker attainment of maximum drug effects. Snorting cocaine produces maximum physiological effects within 40 minutes and maximum psychotropic effects within 20 minutes, however, a more realistic activation period is closer to 5 to 10 minutes, which is similar to ingestion of cocaine. Physiological and psychotropic effects from nasally insufflated cocaine are sustained for approximately 40 – 60 minutes after the peak effects are attained.

Physical Effects
Health problems resulting from cocaine use can lead to severe mental, physical and social problems.
Cocaine is a potent central nervous system stimulant. Its effects can last from 20 minutes to several hours, depending upon the dosage of cocaine taken, purity, and method of administration.
The initial signs of stimulation are hyperactivity, restlessness, increased blood pressure, increased heart rate and euphoria. The euphoria is sometimes followed by feelings of discomfort and depression and a craving to experience the drug again. Sexual interest and pleasure can be amplified. Side effects can include twitching, paranoia, and impotence, which usually increases with frequent usage.
With excessive or prolonged use, the drug can cause itching, tachycardia, hallucinations, and paranoid delusions. Overdoses cause tachyarrhythmias and a marked elevation of blood pressure. These can be life-threatening, especially if the user has existing cardiac problems.
Toxicity results in seizures, followed by respiratory and circulatory depression of medullar origin. This may lead to death from respiratory failure, stroke, cerebral hemorrhage, or heart-failure.
Cocaine is also highly pyrogenic, because the stimulation and increased muscular activity cause greater heat production. Heat loss is inhibited by the intense vasoconstriction. Cocaine-induced hyperthermia may cause muscle cell destruction and myoglobinuria resulting in renal failure. Emergency treatment often consists of administering a benzodiazepine sedation agent, such as diazepam (Valium) to decrease the elevated heart rate and blood pressure. Physical cooling (ice, cold blankets, etc...) and paracetamol (acetaminophen) may be used to treat hyperthermia, while specific treatments are then developed for any further complications.
Cocaine's primary acute effect on brain chemistry is to raise the amount of dopamine and serotonin in the nucleus accumbens (the pleasure center in the brain); this effect ceases, due to metabolism of cocaine to inactive compounds and particularly due to the depletion of the transmitter resources (tachyphylaxis). This can be experienced acutely as feelings of depression, as a "crash" after the initial high. Further mechanisms occur in chronic cocaine use. The "crash" is accompanied with muscle spasms throughout the body, also known as the "jitters", muscle weakness, headaches, dizziness, and suicidal thoughts. Not all users will experience these, but most tend to experience some or all of these symptoms.
Studies have shown that cocaine usage during pregnancy triggers premature labor and may lead to abruptio placentae.
Depression with suicidal ideation may develop in very heavy users.
All these effects contribute a rise in tolerance thus requiring a larger dosage to achieve the same effect.
Physical side effects from chronic smoking of cocaine include hemoptysis, bronchospasm, pruritus, fever, diffuse alveolar infiltrates without effusions, pulmonary and systemic eosinophilia, chest pain, lung trauma, sore throat, asthma, hoarse voice, dyspnea (shortness of breath), and an aching, flu-like syndrome.
A common but untrue belief is that the smoking of cocaine chemically breaks down tooth enamel and causes tooth decay. However, cocaine does often cause involuntary tooth grinding, known as bruxism, which can deteriorate tooth enamel and lead to gingivitis.

Chronic intranasal usage can degrade the cartilage separating the nostrils (the septum nasi), leading eventually to its complete disappearance.
Cocaine may also greatly increase this risk of developing rare autoimmune or connective tissue diseases such as lupus, Goodpasture's disease, vasculitis, glomerulonephritis, Stevens-Johnson syndrome and other diseases. It can also cause a wide array of kidney diseases and renal failure.
Cocaine abuse doubles both the risks of hemorrhagic and ischemic strokes, as well as increases the risk of other infarctions, such as myocardial infarction.

Withdrawal Effects
Cocaine withdrawal often has no visible physical symptoms like the vomiting and shaking that accompanies the withdrawal from heroin or alcohol.
In cases where a patient is unable or unwilling to seek medical attention, cocaine overdoses resulting in mild-moderate tachycardia (i.e.: a resting pulse greater than 120 bpm), may be initially treated with 20 mg of orally administered diazepam or equivalent benzodiazepine (eg: 2 mg lorazepam).
Acetaminophen and physical cooling may likewise be used to reduce mild hyperthermia (<39 C). However, a history of high blood pressure or cardiac problems puts the patient at high risk of cardiac arrest or stroke, and requires immediate medical treatment. Similarly, if benzodiazepine sedation fails to reduce heart rate or body temperatures fails to lower, professional intervention is necessary.

There is no officially approved specific antidote for cocaine overdose, and although some drugs have been found to be useful for treating cocaine overdose in animal studies, no formal human trials have been carried out.
The signs and symptoms of cocaine overdose are related to the psychologic and stimulant effects of the drug. The classic signs are high blood pressure (hypertension) with a fast pulse (tachycardia) and an increased rate of breathing (tachypnea). This occurs with agitation, confusion, irritability, sweating, and hyperthermia (increased temperature). Sometimes seizures may occur.
Cocaine overdose can also present as a heart attack with chest pain. This is thought to result from "spasm" of the coronary arteries that feed the heart muscle or from insufficient supply of blood flow to meet the needs of the stimulated heart muscle. Unfortunately, sudden death may also be the initial presentation to the emergency room; this is due to a lethal heart rhythm precipitated by cocaine consumption.
Stroke, seizures, fever, infection, kidney failure, liver hepatitis, pneumonia, thrombophlebitis (clotting of the veins), and HIV are other potential complications of cocaine use and cocaine overdose.

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