<s>[INST] Hi   I have had a greasy filmy feeling in my mouth and lips for about a month.  Just completed a 2 week antibiotic course about two weeks ago.  Was on them for a bad URI...Im 69 have extensive orthopedic and cardiac issues and lost my wife of 50 years about 2 months ago [/INST] Hi. Thanks for the query. As per your complaint greasy feeling in mouth is commonly seen as a side effect of medication and as you already have a recent history of taking medication, it can be a probable cause. Secondly as you have recently taken a course of antibiotics for 2 weeks, therefore it can also be due to yeast infection in mouth known as Oral Thrush. Another cause for similar symptoms can be Chat Doctor. . I would therefore suggest you to consult an Oral Physician and get evaluated and a thorough clinical evaluation and investigations as per suspected cause can help in diagnosis and treatment can be done accordingly. As of now you can do warm saline gargles, gargle with 1:1 solution of HY </s>