<s>[INST] I am taking Femara having had breast cancer. I am 68 and have taken it since Sept 2012. I am now finding when I sing or talk more than usual my throat chokes up to the point no sound comes out when I sing for awhile and feels tired when talking a lot.. [/INST] Hello and Welcome to ‘Ask A Doctor’ service.I have reviewed your query and here is my advice.Probably, your symptoms are not related to your medicines. Go and consult some ENT specialist as there may be some issues unrelated to your primary disease.Hope I have answered your query. Let me know if I can assist you further.Regards,Dr. B.dinesh </s>