Just learn the following phrase off by heart, practice uttering it whilst opening a one kilogramme tub of paracetemol, wearing socks with sandals...and with a Mr McKay twitch (from Porridge) as you raise the inflection at the end of the statement:
"Take two of these with water after each meal. If it's no better by a week today, come back".
Haha, is it best to also look to schedule a follow up visit on the day I'm not working?!