This is purely a comment on the drug treatment of Lyme disease.  The
standard treatment is either Amoxicillin or Tetracycline, for 21 days,
not 10.  Amoxicillin is certainly compatible with breastfeeding.
However, the fact that you were given erythromicin suggests that maybe
you are penicillin allergic.  Many of us are nervous about giving
tetracycline when children are concerned, and would never give
tetracycline directly to a child or to a pregnant mother.  However,
tetracycline is bound by calcium (that is why you have to take it on an
empty stomach and with no milk products or antacids).  Probably because
of this binding to calcium in milk, tetracycline has negligible
absorption by a breastfeeding baby.  The AAP Committee on Drugs in Human
Milk has tetracycline on its list of drugs compatible with
breastfeeding.  Good luck, Alicia Dermer, M.D.  [log in to unmask]