看來可能官司真難打，查了下，

Safe medications for people with sulfa allergies

Not all drugs that contain sulfonamides cause reactions in all people. Many people with sulfa allergies and sensitivities may be able to safely take the following medications:

• some diabetes medications including glyburide (Glynase, Diabeta) and glimepiride(Amaryl)

https://www.healthline.com/health/allergies/sulfa-sulfite#sulfa-allergy

看來第一次開藥不違反常規，但在病人告知有不良反應後，還開那類藥，就不知可否找醫生擔責，看來需要強有力的律師。