In the PHN population, 12-week mean pain scores were 4.2 and 4.9 for patients treated with pregabalin and gabapentin, respectively. Treatment with pregabalin resulted in an additional decrease of 0.6 and 0.7 when compared to patients receiving gabapentin in the pNeP and PHN populations, respectively. The unit size for purchasing prescription drugs varies depending on availability, drug type, and buyer finances, with economic factors often limiting purchases to small quantities due to the high costs of diverted medications.

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First, not all studies included in the analysis were randomized, which introduces a potential bias. Despite the relatively large number of studies (14 studies), the low number of studies on shared variables hindered subgroup analysis and consideration of different confounding factors. Future studies should prioritize the analysis of Minimal Clinically Important Difference (MCID) to assess clinical relevance. Additionally, the use of multiple scales and limited homogeneity among them make it challenging to compare results and explore different perspectives, such as psychological aspects or specific measures of neuropathic pain. The inclusion of various neuropathic pain etiologies, such as diabetic peripheral neuropathy, postherpetic neuralgia, back pain or urologic chronic pain, adds complexity owing to inherent differences between conditions. The specific type of opioid used for opioid consumption has not yet lyrica 300 mg price been specified.

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