Terrified83

got stressed about this. Need your input guys. My 1st med error! I picked up a shift in a nursing home yesterday. I missed 2 doses of keflex 500mg qid. I was working a day shift. The drug wasn't inside the pt's bin. It was hidden underneath other patient's bin. I did double checked the MARS of all of my patients at the end of the day but still missed it. I just found out this mistake today when the evening nurse yesterday put in the MAR that it wasn't given yesterday! I mentioned this to my supervisor and she told me to fill out an occurrence report, inform the physician and inform the family. The patient was taking the drug for UTI. She was in the middle of finishing the antibiotic therapy. I noticed that before this she originally was taking cipro, then they changed it to another antibiotic and then they changed it another antibiotic which is keflex. I am terrified of what the family will say. I am diligent with my drugs but I didn't know how I missed that. So troubled, I can't sleep well.