Many people do have different physicians for their Botox and their injectable fillers, often because they have trust in that doctor and like the work they do. Also they are not necessarily neede to be topped up at the same time, since they last different amounts of time.There is no need to change if you are happy with your situation.Usually the Botox and fillers are not in identical parts of the face, so Botox is in the glabella for instance, and fillers are in the cheeks, for instance, giving no real risk of one interfering with the other. As a rule of thumb, I will do both at the same time if the areas treated do not directly overlap, otherwise I will do them apart. If there is any doubt, then apart, Botox first then filler second. The most important is finding one physician or even two in whom you have confidence and get a good treatment from them. From: Miss Jane Olver, Consultant Oculoplastic Surgeon, London, UK