Drug from figure with a short amount of coke (9)

'drug' is the definition.
(drug which treats heart conditions)

'figure with a short amount of coke' is the wordplay.
'figure' becomes 'digit' (numerical figure).
'with' says to put letters next to each other.
'short' means to remove the last letter.
'amount of coke' becomes 'line' (as in a line of cocaine).
'line' with its last letter removed is 'lin'.
'digit'+'a'+'lin'='DIGITALIN'

'from' acts as a link.