I accidentally took one of my aunts generic Dilantin thinking it was my antibiotic. I get regular drug test from my Dr. and I'm worried this mistake will cost me a Dr. that cares. I need to know how long it stays in your system (blood and urine)?

What is the time frame between taking the pill and taking the test? Explain what happened before you take the test.

How about being honest and telling doctor about the mistake.