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Review ArticleReview

Topical and Peripherally Acting Analgesics

Jana Sawynok
Pharmacological Reviews March 2003, 55 (1) 1-20; DOI: https://doi.org/10.1124/pr.55.1.1
Jana Sawynok
Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
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Abstract

Acute nociceptive, inflammatory, and neuropathic pain all depend to some degree on the peripheral activation of primary sensory afferent neurons. The localized peripheral administration of drugs, such as by topical application, can potentially optimize drug concentrations at the site of origin of the pain, while leading to lower systemic levels and fewer adverse systemic effects, fewer drug interactions, and no need to titrate doses into a therapeutic range compared with systemic administration. Primary sensory afferent neurons can be activated by a range of inflammatory mediators such as prostanoids, bradykinin, ATP, histamine, and serotonin, and inhibiting their actions represents a strategy for the development of analgesics. Peripheral nerve endings also express a variety of inhibitory neuroreceptors such as opioid, α-adrenergic, cholinergic, adenosine and cannabinoid receptors, and agonists for these receptors also represent viable targets for drug development. At present, topical and other forms of peripheral administration of nonsteroidal anti-inflammatory drugs, opioids, capsaicin, local anesthetics, and α-adrenoceptor agonists are being used in a variety of clinical states. There also are some clinical data on the use of topical antidepressants and glutamate receptor antagonists. There are preclinical data supporting the potential for development of local formulations of adenosine agonists, cannabinoid agonists, cholinergic ligands, cytokine antagonists, bradykinin antagonists, ATP antagonists, biogenic amine antagonists, neuropeptide antagonists, and agents that alter the availability of nerve growth factor. Given that activation of sensory neurons involves multiple mediators, combinations of agents targeting different mechanisms may be particularly useful. Topical analgesics represent a promising area for future drug development.

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Pharmacological Reviews: 55 (1)
Pharmacological Reviews
Vol. 55, Issue 1
1 Mar 2003
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Review ArticleReview

Topical and Peripherally Acting Analgesics

Jana Sawynok
Pharmacological Reviews March 1, 2003, 55 (1) 1-20; DOI: https://doi.org/10.1124/pr.55.1.1

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Review ArticleReview

Topical and Peripherally Acting Analgesics

Jana Sawynok
Pharmacological Reviews March 1, 2003, 55 (1) 1-20; DOI: https://doi.org/10.1124/pr.55.1.1
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    • I. Introduction
    • II. Peripheral Pain Signaling
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