L.S.
This book is the bible to what you can and cannot take while breastfeeding. You can search it by clicking on the book: http://www.amazon.com/Medications-Mothers-Milk/dp/0977226...
Also, here are some links that can help you:
http://www.kellymom.com/health/meds/cold-remedy.html
http://www.kellymom.com/health/meds/medref.html
http://www.kellymom.com/health/meds/med-risks.html