Number of		Percent with outcome
Outcome - daily dose	Studies	Participants	Pregabalin	Placebo	Relative risk (95% CI)	NNH (95% CI)
Somnolence
150 mg	3	527	15	7	2.2 (1.3 to 3.7)	12 (7.3 to 34)
300 mg	4	713	19	6	3.0 (2.1 to 5.3)	7.4 (5.5 to 11)
600 mg	4	732	25	6	4.4 (2.8 to 6.8)	5.2 (4.1 to 7.0)
Dizziness
150 mg	3	527	13	10	1.3 (0.8 to 2.1)	not calculated
300 mg	4	713	30	9	3.2 (2.3 to 4.6)	4.7 (3.7 to 6.5)
600 mg	4	732	35	9	4.0 (2.8 to 5.7)	3.8 (3.2 to 4.9)
Adverse event discontinuation
150 mg	3	527	9	7	1.3 (0.7 to 2.3)	not calculated
300 mg	4	713	17	6	2.7 (1.7 to 4.3)	9.3 (6.5 to 16)
600 mg	4	732	19	5	3.7 (2.3 to 6.0)	7.1 (5.3 to 11)