A drug is any substance that reasons a change in an organism's body structure or psychology while consumed. In pharmacology, a drug is a chemical substance, typically of acknowledged structure, which, while administered to a residing organism, produces a organic effect. A pharmaceutical drug, also referred to as a medicine or medication, is a chemical substance used to treat, cure, prevent, or diagnose a sickness or to sell well-being.   Drugs are generally outstanding from food and materials that provide dietary support. Consumption of capsules may be via inhalation, injection, smoking, ingestion, absorption through a patch at the skin, or dissolution below the tongue. In the United Kingdom, behind-the-counter drugs are called pharmacy drugs which can only be offered in registered pharmacies, via or below the supervision of a pharmacist. These medicines are designated by means of the letter P at the label.   A medicinal drug or remedy is a drug taken to remedy or ameliorate any signs and symptoms of a contamination or scientific condition. The use can also be as preventive medicine that has destiny advantages however does now not deal with any existing or pre-current sicknesses or symptoms   There are a wide form of addictive materials that exist, but the most common sorts are classified below six principal categories: alcohol, benzodiazepines, illicit capsules, opiates, sleeping pills and stimulants.   Nootropics, also generally mentioned as "smart pills", are drugs which can be claimed to improve human cognitive abilities. Nootropics are used to improve memory, concentration, thought, mood, and learning. An increasingly used nootropic amongst students, also referred to as a take a look at drug, is methylphenidate branded normally as Ritalin and used for the remedy of attention deficit hyperactivity disorder (ADHD) and narcolepsy.   Other capsules called dressmaker pills are produced. An early example of what today would be labelled a 'fashion designer drug' became LSD, which turned into synthesised from ergot.[32] Other examples encompass analogs of performance-enhancing tablets along with fashion designer steroids taken to improve physical talents and those are from time to time used (legally or no longer) for this purpose, often by expert athletes.  

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