I was recently diagnosed with Strep throat. I was prescribed penicillin, but I m worried the dose is wrong. I m female, 34, 135 lbs, 5 7 , with no existing health problems. My doc prescribed me 500 mg of penicillin vk 3x per day (every 8 hours), but everything I m reading says the proper dose for an adult with strep is 500mg 2x per day (or 250mg 4x per day). Why is my prescription higher than the recommendation?