Hi @MaryJoan i think you might be referring to mepitel instead of mepilex? Mepitel is a clear plastic film that is placed over the entire treatment area (from the middle of chest to half way around your back, from arm pit to navel as an idea) it helps to lessen the skin reaction and also from your clothes rubbing on your skin. It is in place for the entire treatment and often a wk or so after. It does roll at the edges but these can be touched up. It does not work for every patient due to allergies, larger ladies, excess sweat etc nor does every department have access to it. The mepilex (in case you did actually mean that) is a dressing that can be used if your skin does break down.
unfortunately there is not much “preparation” that can be done, you could start moisturising prior to starting if you really want to, moo goo cream is a good 1, there are others including sorbolene, candula, the nurses should have a standard 1 they recommend.
the how long to wait question is again a bit of an unknown sorry, it depends on how your skin reaction is and how fatigued you are.... the general guide is a wk for every wk of treatment so it sounds like your having 16 treatments I would give at least 4wks but it’s soooooo different for everyone. I myself should finish radiation at the end of July and have booked a holiday in October to ensure I have my energy levels and skin back to normal so I can really enjoy it!
sorry i can’t give you any definitive answers, best wishes x