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Table 6 Prescribed opioids and the incidence of somnolence and dizziness

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

Concomitant use of opioid with pregabalin N Developed somnolence Developed dizziness
 Non-prescribed patients 141 28 (19.9 %) 21 (14.9 %)
 Prescribed patients 54 19 (35.2 %) 13 (24.1 %)
Concomitant opioids N Developed somnolence or dizziness
 Fentanyl 26 7 (26.9 %)
 Oxycodone 23 11 (47.8 %)
 Tramadol 18 7 (38.9 %)
 Morphine 4 0 (0 %)