MRSA, is just a more resistant form of a bacteria that normally lives on anyone's body. Unfortunately, sometimes the bacterium can become invasive, or be accidentally introduced in to areas of the body it isn't usually (i.e. the deeper layers of the skin or the bloodstream) and can cause infectious diseases.
MRSA stands for Methicillin Resistant Staphylococcus aureus and is a cousin of the more common (at least in Canada) Methicillin Sensitive Staphylococcus aureus. The only difference between the two is that MRSA is resistant to all forms of penicillin drugs. SOOOOOOOO, there are other agents which can be used to treat MRSA which are all antibiotics: Septra (or Bactrim in the states), levofloxacin (sometimes), doxycycline, vancomycin, linezolid, tigecycline, ceftibiprole etc. If the antibiotics are not working, it's important to:
#1. Retest the organism and make sure to find out that the organism is still sensitive to the antibiotics the person is using.
#2. If there are large abscesses, no amount of antibiotics will penetrate them, and it's necessary to drain the abscesses.
#3. You can do a decolonization protocol which is a week of special body wash, shampoo, nasal ointment and sometimes oral treatments to get rid of the MRSA from your skin. They also need to check if there is MRSA present in the anus/perineal area, in which case oral antibiotics are given to clean the GI tract as well.