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The terms 'opioid' and 'opiate' are sometimes used interchangeably, but the term 'opioid' is used to designate all substances, both natural and synthetic, that bind to opioid receptors in the brain. [4] Opiates are alkaloid compounds naturally found in the opium poppy plant Papaver somniferum. [5] [6]
Opiate overdose symptoms and signs can be referred to as the "opioid toxidrome triad": decreased level of consciousness, pinpoint pupils and respiratory depression. Other symptoms include seizures and muscle spasms. Sometimes an opiate overdose can lead to such a decreased level of consciousness such that the person will not wake up.
[56] [78] As a result of downregulated signaling through these proteins, opiates cause VTA neuronal hyperexcitability and shrinkage (specifically, the size of the neuronal soma is reduced). [56] It has been shown that when an opiate-naive person begins using opiates in concentrations that induce euphoria, BDNF signaling increases in the VTA. [79]
Tolerance is the process by which the body continually adapts to the substance and requires increasingly larger amounts to achieve the original effects. Withdrawal refers to physical and psychological symptoms experienced when reducing or discontinuing a substance that the body has become dependent on.
A toxidrome (a portmanteau of toxic and syndrome, coined in 1970 by Mofenson and Greensher [2]) is a syndrome caused by a dangerous level of toxins in the body. It is often the consequence of a drug overdose. Common symptoms include dizziness, disorientation, nausea, vomiting and oscillopsia.
An opiate is an alkaloid substance derived from opium (or poppy straw). [1]
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Morphine withdrawal is considered less dangerous than alcohol, barbiturate, or benzodiazepine withdrawal. [55] [56] The psychological dependence associated with morphine addiction is complex and protracted. Long after the physical need for morphine has passed, addicts will usually continue to think and talk about the use of morphine (or other ...