To what concentration must the Torbay Pharmaceuticals Limited product Magnesium Sulfate 50%w/v Solution for Injection or Infusion be diluted before intravenous administration?

The Torbay Pharmaceuticals Limited product Magnesium Sulfate 50%w/v Solution for Injection or Infusion must be diluted to 20% or less before intravenous administration, with the injection rate not exceeding 1.5 ml/minute of a 10% solution or its equivalent.