Am Breastfeeding My 11 Month Old. My Dad Bought Some

Am breastfeeding my 11 month old. My dad bought some cough mixture for me but it says to check w doc/pharmacist if breastfeeding... Do you know if it wd be OK? It's called Gees Linctus, active ingredients are anhydrous morphine 0.0165% w/v & squill 1.67% w/v, not recommended for under 12s. Thank you