If you are allergic to the drugs, you need to change the drugs in time, and if you are allergic to the stent material, you can take anti-allergy drugs. 1. Drug allergy: after cardiac stenting, need to take antiplatelet drugs, reduce blood fat to stabilize plaque, some patients may have drug allergic reaction, it is recommended to change the drugs in time, away from allergens, pay attention to preventing infections, and drink more water. 2. Material allergy: most of the materials of cardiac stent are metal, patients may have allergy to metal, they can take anti-allergy drugs orally, such as loratadine tablets, levocetirizine hydrochloride tablets, etc, to improve the allergy. Allergy after cardiac stent placement should seek medical advice in time and be treated under the regular guidance of the doctor.