I may be the only person who ever inquires on this drug, but just in case I'm
not, I am posting Tom Hale's response to my inquiry concerning Fosomax to the
list:

---------------------------------------

"Fosamax is an aminobisphosphonate that selectively blocks calcium
 reabsorption by the osteoclast.  Basically, bone is under constant
restoration and destruction throughout life.  This drug blocks the breakdown
and release of calcium by the osteoclast.  The product literature says that
it is secreted into human milk and should not be used in lactating women.

Fosamax has strange kinetics,  it is very poorly  absorbed,  only 0.7% of the
oral dose is absorbed.  It rapidly distributes out of the plasma compartment
and deposits in bone.  The bone terminal half-life is 10 years (yes, years).
My greatest concern is that a child's bones are constantly undergoing change,
including breakdown, and rebuilding in a different shape as the body grows.
 We have no understanding as to how this product would alter the skeletal
structure if used in early pediatrics.  Further, once its in there,  it would
take years to get rid of it.

This is one of those occassions that I would recommend not breastfeeding.
 The risk to the infant may to be too high,  we simply don't know."