You'll have to read your feed tag and see what the Active Ingredient is but in most cases Medicated feed either contains Amprolium or Lasalocid. Now there are few feed are also medicated with Bacitracin in combination with either Amprolium or Lasalocid.
If your feed is medicated with either Amprolium, Lasalocid or Bacitracin you'll be fine because they do not enter the egg.
*Note*
Amprolium can go by the trade names Corid and Amprovine, Amprolium, Amprol, Anticoccid.
Lasalocid can go by the trade name Bovatec.
Bacitracin can go by the trade names Bacitracin Methylene Disalicylate and BMD.