Table 4.

 Adverse drug reactions associated with single tocolytic treatment. Values are numbers (percentages) of women unless stated otherwise

Tocolytic	No of patients	Severity of adverse drug reaction		Total	Relative risk* (95% CI)
		Serious	Mild
β mimetics	175	3 (1.7)	4 (2.3)	7 (4.0)	3.8 (1.6 to 9.2)
Nifedipine	542	5 (0.9)	6 (1.1)	11 (2.0)	2.0 (0.8 to 4.8)
Atosiban	575	0	1 (0.2)	1 (0.2)	0.07 (0.01 to 0.4)
Cyclo-oxygenase inhibitors	35	0	0	0	NA

NA=Not applicable.

*For total adverse drug reactions.