Hello and thanks for the question.
Biodrixil is the antibiotic cefadroxil, a common cephalosporin antibiotic. Although you did take twice the amount prescribed, you are still within normal dosing for this drug (actually at the max dose). At most, you might expect an increase in side effects, such as stomach upset/GI irritation and/or diarrhea.
You're going to live. :) Best of luck to you and thanks again for the question. I hope you feel better sooner!
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