Drugs
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Review Comparative Study
Opioid analgesics: comparative features and prescribing guidelines.
The term 'opioid' is a generic term for naturally occurring, semisynthetic and synthetic drugs which combine with opioid receptors to produce physiological effects and which are stereospecifically antagonised by naloxone. For clinical purposes, opioids can be classified according to their receptor interactions (agonist, partial agonist, agonist-antagonist and antagonist), the pain intensity for which they are conventionally used (moderate or severe), and their half-life (short or long). Pure agonists conventionally used for moderate pain, short and long half-life pure agonists conventionally used for severe pain, mixed agonist-antagonists and partial agonist opioids are described in detail. ⋯ The regimen for opioid medications should generally provide around-the-clock analgesia with provision for rescue doses for the management of exacerbations of the pain not covered by the regular dosage. At all times, uncontrolled pain should be addressed by gradual increase in the opioid dose until either pain control is achieved or intolerable and unmanageable adverse effects supervene. The management of pain with opioid analgesics demands frequent patient assessment and a readiness to re-evaluate the therapeutic plan in the setting of either inadequate relief or adverse effects.
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Premature and full-term neonates, infants and children are capable of experiencing pain just like adults, and deserve aggressive treatment. Assessment of pain is difficult in the preverbal group. However, physiological and behavioural responses to noxious stimuli are well developed even in the fetus, and modifying these responses through treatment can affect outcome. ⋯ Drug dependence and withdrawal can be avoided by using the opioids appropriately and following logical weaning schedules after long term use of these agents. Use of needles for administering analgesia is still an intimidating part of the process for young children. The development of drugs having fewer adverse effects and noninvasive administration techniques will be important research priorities in the future.