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Table 4 Rates of reported adverse events among pregnant women who commenced supplementation with assigned multivitamin

From: Effect of iron content on the tolerability of prenatal multivitamins in pregnancy

Adverse Events

35 mg iron group (n = 57*)

60 mg iron group (n = 47*)

No. subjects (%) who reported any adverse event(s)

27 (47%)

21 (45%)

Nausea and/or vomiting(NVP)

12 (21%)

9 (19%)

[Proportion who reported NVP before starting assigned multivitamin]

[11/12]

[9/9]

Constipation

13/57 (23%)

10/47 (21%)

[Proportion who reported constipation before starting assigned multivitamin]

[7/13]

[5/10]

Heartburn/Acid reflux

4/57 (7%)

1/47 (2%)

[Proportion who reported heartburn/reflux before starting assigned multivitamin]

[2/4]

[1/1]

Diarrhea

1/57 (2%)

3/47 (6%)

[Proportion who reported diarrhea before starting assigned multivitamin]

[1/1]

[1/3]

Abdominal pain/cramps

5/57 (9%)

5/47 (11%)

[Proportion who reported abdominal pain or cramps before starting assigned multivitamin]

[1/5]

[2/5]

Swallowing difficulties with tablet size

2/57 (4%)

None

[Proportion who reported swallowing difficulties before starting assigned multivitamin]

[0/2]

 
  1. *Only subjects who completed the study, with no significant difference detected when partial data from subjects who did not complete the study were included.