Associated symptoms: symptom present 2 hours after taking study medication
Intervention	Studies	Attacks treated	Treatment (%)	Placebo (%)	Relative risk (95% CI)	NNTp (95% CI)
Nausea
Aspirin 1000 mg versus placebo	4	1446	26	33	0.79 (0.68 to 0.93)	14 (8.6 to 45)
Aspirin 900 mg plus metoclopramide 10 mg versus placebo	2	735	34	49	0.69 (0.58 to 0.82)	6.7 (4.6 to 13)
Aspirin 900 mg plus metoclopramide 10 mg versus sumatriptan 100 mg	2	612	45	45	0.99 (0.83 to 1.2)	Not calculated
Vomiting
Aspirin 1000 mg versus placebo	3	1182	3	4	0.77 (0.43 to 1.4)	Not calculated
Aspirin 900 mg plus metoclopramide 10 mg versus placebo	2	728	4	11	0.33 (0.18 to 0.59)	13 (8.8 to 26)
Aspirin 900 mg plus metoclopramide 10 mg versus sumatriptan 100 mg	2	608	8	13	0.63 (0.39 to 1.02)	Not calculated
Photophobia
Aspirin 1000 mg versus placebo	5	1639	42	52	0.79 (0.72 to 0.87)	9.2 (6.4 to 17)
Aspirin 1000 mg versus sumatriptan 50 mg	2	726	32	27	1.2 (0.94 to 1.5)	Not calculated
Phonophobia
Aspirin 1000 mg versus placebo	5	1639	37	49	0.75 (0.68 to 0.84)	8.3 (6.0 to 14)
Aspirin 1000 mg versus sumatriptan 50 mg	2	726	28	26	1.05 (0.83 to 1.3)	Not calculated