You need to be precise as errors in medication doses or packaging could have serious consequences for patients.
Multitasking is also necessary. You could be filling prescriptions while answering phone calls and assisting patients at the counter.
You might also stand for long periods of time.
However, if you have good communication skills, comfortable with numbers, a basic understanding of medical terminology, and you're familiar with computer software and other technology used in pharmacies you'll more than likely be okay.