Check out this website/pdf. Go to page 5 and look for the chemical make-up of the drug. Use Hale to understand the molecular weights and how the med will (or will not) pass into the breastmilk to get an idea of what possible risks or side effects there may be. This was not easy to find. :-) The Xyzal website does NOT have this information anywhere I could find.Hope this helps! http://products.sanofi-aventis.us/xyzal/xyzal.pdf Jaye Simpson, IBCLC, CIIM Breastfeeding Network Sacramento, CA www.breastfeedingnetwork.net *********************************************** Archives: http://community.lsoft.com/archives/LACTNET.html To reach list owners: [log in to unmask] Mail all list management commands to: [log in to unmask] COMMANDS: 1. To temporarily stop your subscription write in the body of an email: set lactnet nomail 2. To start it again: set lactnet mail 3. To unsubscribe: unsubscribe lactnet 4. To get a comprehensive list of rules and directions: get lactnet welcome