Prescribed amoxicillin 500 mg 2 pills twice a day for 7 days. accidentally been taking 1 pill twice a day for 5 days. can i up it to 3 or 4, 2x a day?

Why?: It depends on what your are taking it for and how accurate the original diagnosis and Rx were.

Please don't !!!: The 500 mg twice a day should be an adequate dose for most infections. You could increase to 2 twice a day and possibly extend to a total of 10 days. But a lot of this depends on how much your infection is improving. You could also possibly continue 1 twice a day for 10 days. But I believe the best thing to do is to contact the prescribing Dr. to ask his or her advice. 3 or 4 2x/day is too much!