The Sydney practice Doctors on Darling apparently shows how "natural fillers can help reduce lines, fill lips, enhance cheeks and improve the appearance of hollows under eyes".
Principals Dr Anne Charteris and Dr Maureen Boyd were said to be perform cosmetic procedures in the surgery.
But some tagged the GPs giving a free treatment donated by cosmetic surgery companies as a door prize as unprofessional and a breach of ethics.
"Whether doctors provide a service of cosmetic enhancement is one issue," News.com.au quoted Charlotte Rees, Associate Professor in Medical Education at Sydney University, as saying.
"I think it's more worrying having flyers to actively recruit and encourage women to have cosmetic enhancements," she added.
Dr Charteris, however, said the procedures were carried out on a fellow doctor.
She said: "This was an information evening, we didn't make any bookings with patients, we didn't do anything on them."