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Top ten adverse events most frequently reported in selected studies.
| Adverse event | Number of times reported |
|---|---|
| Miscarriage/spontaneous abortion | 31 |
| Preterm birth | 31 |
| Stillbirth | 25 |
| Fever, maternal | 19 |
| Pre-eclampsia | 14 |
| Site pain | 12 |
| Low birth weight | 12 |
| Elective abortion | 11 |
| Respiratory distress | 11 |
| Small for gestational age | 11 |
