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"Strength" is defined as analgesic potency relative to oral morphine. Tolerance , sensitization , cross-tolerance , metabolism , and hyperalgesia may be complex factors in some individuals. Interactions with other drugs , food and drink , and other factors may increase or decrease the effect of certain analgesics and alter their half-life.
This is a list of opioids, opioid antagonists and inverse agonists. Opium and poppy straw derivatives. Seedhead of opium poppy with white latex.
A chart outlining the structural features that define opiates and opioids, including distinctions between semi-synthetic and fully synthetic opioid structures. An opiate is an alkaloid substance derived from opium (or poppy straw). [1]
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]
[citation needed] These drugs range from 25% the analgesic strength of codeine (or slightly more than 2% of the strength of morphine) to several thousand times the strength of morphine, to powerful opioid antagonists, including naloxone (Narcan), naltrexone (Trexan), diprenorphine (M5050, the reversing agent for the Immobilon dart) and ...
The WHO guidelines recommend prompt oral administration of drugs ("by the mouth") when pain occurs, starting, if the patient is not in severe pain, with non-opioid drugs such as paracetamol (acetaminophen) or aspirin, [1] with or without "adjuvants" such as non-steroidal anti-inflammatory drugs (NSAIDs) including COX-2 inhibitors.
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Concentration-response curves illustrating the concept of potency. For a response of 0.25a.u., Drug B is more potent, as it generates this response at a lower concentration.