Some antibiotics do give a metallic taste
or taste disturbances you have not mentioned the name of your antibiotics so its difficult to say.
The taste change usually goes in a weeks time of stoppage of antibiotics .
But still you have it could be because of some gastro -esophageal reflux
You can take---
+Domperidom two times a day half an hour before meals
gel 2 tsf two times a day half an hour before meals
gargle 2 tsf in half glass of water two times a day
this will help.