Hello, my mother is 54 years old and suffering from breast carcinoma. The doctor has removed the whole breast after operation and suggested there are no requirements for the chemotherapy only tablets are prescribed for taking the cure of disease and the medicine is 1.exemestane 25 2.phycolan. My concern is that exemestane 25 is coming to many companies i.e. Pfizer, natco pharma and others but pfizer company medicine cost is much higher than natco. Kindly confirm that we can take medicine of natco pharma or can go to pfizer because medicine is the same but prices are too much of a difference. Any difference between the effectiveness of both companies. Kindly suggest.