if its leaking from the head, long after you turn off, then its not the head at fault,
it will be the shower unit, possible grit or dirt in solanoid valve, or worn valve, in which case best fix a new shower unit,
it is normal for shower head to dribble a short while after use,
or if head is dribbling at same time as showering, then replace head
i am a plumber and if i was nearer id be glad to sort it for you but, your too far away lol
