Hemp is also a name for the Cannabis plant.
"Allergy to cannabis' should be sufficient info on your bracelet, since i haven't heard about hemp used in emergency medicine.
Blessings
Nikodicreta
Hi, welcome to the forum, as rightly stated by Nikodicreta, there is no specific medical term for cannabis allergy. We can simply term it as ' cannabis allergy' or ' allergic to cannabis'. Hemp is not used commonly in medical practice.
I hope this helps. Take care and regards.