Can Codeine Linctus Be Taken Along With Diazepam?

Hello. I am taking 2 mg of Diazepam (2 to 3 times per day) as well as 80 mg (1 tablet each morning) of Propranolol. My questions is, is it safe for me to take Codeine Linctus?

(I should add that I am also taking 30 mg of Lansoprazole per day and 100 mg Fersaday (Ferrous Fumarate 322mg) per day.)