Thanks for everyone's answers! I am posting below:
From Cherida:
I put in for 2
Then I write " partner treatment" in the comment section
I still put in for a refill in case someone throws up
From Rebecca:
I write ept by hand on a separate rx and it gets filled at the same time
From Jen:
I write double the amount under quantity and haven't had any trouble. So just write for 2 azith packets or 16 flagyl for example
From Debbie:
I have my own prescriptions and would write EPT on it but I am sure there is another way to do it.