replacement therapy

[rĭ-plāsmənt]
n.
  1. Therapy designed to compensate for a lack or deficiency arising from inadequate nutrition, from certain dysfunctions, or from losses, as by the administration of natural or synthetic substances.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.