Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
Systematic review	307 adults with cervical dystonia 3 RCTs in this analysis	Dry mouth 45/203 (22%) with botulinum B toxin 3/104 (3%) with placebo	OR 5.19 95% CI 2.69 to 10.03 P <0.00001 NNH 6 95% CI 6 to 8	Large effect size	placebo
Systematic review	307 adults with cervical dystonia 3 RCTs in this analysis	Dysphagia 39/204 (19%) with botulinum B toxin (10,000 U) 3/104 (3%) with placebo	OR 4.97 P <0.00003 NNH 8 95% CI 7 to 11	Moderate effect size	placebo