Because of supply problems here in Northern Ireland I can no longer get Oestrogel, have been changed to Sandrena. Was on 2 pumps a day of Oestrogel, now on 1mg sachet of Sandrena. 2 pumps of Oestrogel delivers 1.5mg of oestradiol but doctor is saying 1mg of Sandrena is equivalent, how can this be? Has anyone any experience of this?