The cordial sounds like dreadful stuff, from Wiki:
"Godfrey's Cordial, a simple mixture of morphine and treacle, was particulary sinister, since it had a tendency to separate after time, with the morphine sinking to the bottom. Pharmacies sold Godfrey's Cordial out of large jugs to any adult or child who wanted some, so anyone who bought the last few doses from the jug were probably getting straight morphine. Kids got so addicted to it that infants would recognize the distinctive bottle of Godfrey's Cordial and doggedly chew the cork off. Older children who were sent to the chemist to buy a week's supply would often drink it all before they made it home".
Viv.