If you step up to the counter and no one helps you within five seconds, do one or more of the following:
Drop your keys on the counter
Clear your throat
Knock on the counter
Rustle your purse, bag, or keys
Say "Hello Hello" because one "Hello" just isn't enough
Look around the entire store like you need help
Look around the store like you're admiring the view of the Grand Canyon. Stand on your tippy toes while doing this
Whistle a merry tune
Lift your body up and look over the counter to see if anyone is back there
Do a fake cough
If you're chewing gum, blow a large bubble until it pops loudly
Drop your purse on the counter
Drum on the counter like you're in a rock and roll band
Say "I'll call you back, I'm at the pharmacy" while holding your cell phone to your ear. If it is a flip-phone, snap it shut loudly
Have your baby make noise or start to cry
Yell out, "Is [name of the other pharmacist] here?
Walk down to the other window briskly, look mad, and say "We need some help down here!"
If another ten seconds pass, try another item from the list above. If that doesn't work, immediately get a manager from the grocery. There's absolutely no reason why you should have been made to wait a minute or two.