You raised a very pertinent & important question.
According to the medical ethics, a doctor has to prescribe only generic medicine.
In Homoeopathy, the medicines are always single entity. So there will not arise the question of branded name.
For example, Arnica. It is a medicine prepared out of Arnica plant.
There is no branded drug, as there is no alternative for individual homoeopathic remedy.
Nice to see such kind of questions