你要自己先调研一下他给你的药是不是同一种药- Medication has many different brand names。一般来讲药剂师是不可能擅自改药的- this is the very basic rule. 如果你有过敏，and the allergy record is on the file, Even the MD gave the prescription, the pharmacist is responsible to check your allergy record and communicate this with the MD. So, the point is :
Do you have allergy record on file which states that you are allergic to Sulfa?
