These characterizations were in agreement with a typical NMR spectrum for PGL (Komisarek et al., 2022). This finding may illustrate acceptable purity in terms of PGL itself and not necessarily other adulterants or impurities. On the other side, the UPLC method was applied to the powder samples for quantitative analysis of PGL. As shown in Table 4, the analytical results of the powder samples for PGL showed higher concentrations than the reference standard (Figure 5A), suggesting the powders contained impurities/additional compounds other than the expected PGL. Notably, the United States Pharmacopeia (USP) recommended the acceptable range for PGL assay is 98%–102% on a dried basis. PGL concentrations above the recommended range suggest that the powder samples likely contain other substances.
- As PGL is known to depress the Central Nervous System (CNS), its use with other CNS depressants significantly elevates the danger of severe toxicity and mortality.
- A Waters® ACQUITY UPLC-PDA system was used for separation, equipped with a Phenomenex C18 column (2.1 × 50 mm, 1.8 µm).
- SMRs were introduced in primary care in England in 2020 for a range of patients, including those using potentially addictive pain management medication.
1 UPLC-PDA Method validation
It works by binding to certain calcium channels in the brain and spinal cord, which helps reduce the efficiency of the neurotransmitters that transmit messages of pain and seizures. “Now that we have more pharmacists working within general practices, should they be reviewing patients taking pregabalin and gabapentin to ensure it is being prescribed appropriately? The increasing number of drug-related deaths may in part be addressed by ensuring that pregabalin is being prescribed appropriately. LC-MS/MS performance displays the precursor and product in (m/z) from the mass spectrum of the adulterated sample. System suitability of six independent preparations of PGL reference standard (2 mg/mL) for UPLC-PDA method.
ORIGINAL RESEARCH article
This UPLC-PDA method buy lyrica online achieved enhanced selectivity through its optimized chromatographic conditions. Importantly, the use of a 1.8 µm particle C18 column (50 × 2.1 mm) at 40°C improved peak sharpness and resolution compared to conventional HPLC, reducing peak widths and reducing co-elution risks. The method’s selectivity was enhanced by the buffered mobile phase (minimizing peak tailing) and 210 nm detection (avoiding matrix interference), while the small particle size (1.8 µm) and low injection volume (3 µL) improved peak symmetry and resolution. A cohort of 18,951 patients was prescribed pregabalin; dosing information was available for 13,480 (71.1%). Median (interquartile range) prescribed average daily dose (ADD) of pregabalin for all patients was 150.0 (162.5) mg/day; this was highest in patients with epilepsy (191.9 mg/day), followed by neuropathic pain (158.0 mg/day) and GAD (150.0 mg/day). Only 1.0% (136/13,480) of patients were prescribed an ADD of pregabalin over the maximum approved dose of 600 mg/day.
