Hello @jeis68. As @colleenyoung mentioned, filgrastim (Neupogen) is a medication which can help treat neutropenia which is a condition of low white blood cells, especially after chemotherapy. Chemo can compromise a patient’s immune system as it lowers blood counts of red/white cells as well as platelets a week or so after the treatment. This leaves the patients vulnerable to infections. Neupogen can help push the production of white blood cells, helping patients recover their WB cell count faster.

It’s most commonly given the day after a chemo round has been completed.
Your question is whether this is an ongoing treatment or if it’s a one and done. That will depend on your medical condition and the cause for the low white blood cell count. If you’re having ongoing chemo sessions then this may be a monthly treatment for you.

Are you currently having chemo or another medical condition which is lowering your white blood count? Have you had a fligrastim injection?