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Pregabalin

In the Treatment of Postherpetic Neuralgia

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Abstract

▴ Pregabalin, the pharmacologically active S-enantiomer of 3-aminomethyl-5-methyl-hexanoic acid, has a similar pharmacological profile to that of its developmental predecessor gabapentin, but showed greater analgesic activity in rodent models of neuropathic pain.

▴ The exact mechanism of action of pregabalin is unclear, although it may reduce excitatory neurotransmitter release by binding to the α2-gd protein subunit of voltage-gated calcium channels.

▴ Oral pregabalin 150–600 mg/day, administered twice or three times daily, was superior to placebo in relieving pain and improving pain-related sleep interference in three randomised, double-blind, placebo-controlled, multicentre studies of 8–13 weeks’ duration in a total of 776 evaluable patients with postherpetic neuralgia (PHN).

▴ Weekly mean pain scores (primary endpoint; assessed in all three studies) and weekly mean sleep interference scores (assessed in two studies) were significantly improved at 1 week. In two studies, significant improvements in daily mean pain scores were apparent on the first or second day of treatment with pregabalin administered three times daily.

▴ Pregabalin was generally well tolerated when force-titrated over 1 week to fixed dosages (maximum 600 mg/day) in clinical trials that enrolled mostly elderly PHN patients. Dizziness, somnolence and peripheral oedema of mild-to-moderate intensity were the most common adverse events.

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Notes

  1. The use of trade names is for product identification purposes only and does not imply endorsement.

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Correspondence to James E. Frampton.

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Frampton, J.E., Foster, R.H. Pregabalin. Drugs 65, 111–118 (2005). https://doi.org/10.2165/00003495-200565010-00011

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