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Table 1 Characteristics of study population

From: Opioid analgesics increase incidence of somnolence and dizziness as adverse effects of pregabalin: a retrospective study

Demographic factors N Median (range)
 Male 114 (59.5 %)  
 Female 81 (41.5 %)  
 Age   67.0 (20–90)
Dose of pregabalin   Median (range)
 Initial dose, mg/day   75 (25–450)
 Maintenance dose, mg/day   150 (25–450)
Adverse effects N
 Patients who developed one or both of side effects 63 (32.3 %)
 Patients who developed somnolence 47 (24.1 %)
 Patients who developed dizziness 34 (17.4 %)