Answer
Selected injectable products advise use only when considered essential because safety is not fully established. The selected Epsom Salts product states that it should not be used while breastfeeding.
Sources for this answer
- Magnesium Sulfate 50% w/v Solution for Injection/Infusionemc · SmPC Current selected SmPC · Version 3
- Magnesium Sulfate 10% w/v solution for infusion