Keflex is a cold and flu medicine, used for the treatment of colds, fever, headache, neuralgia, rheumatic pain and other diseases. Because it is a compound preparation, which contains aminopyralid, all have obvious adverse reactions and more, such as some rashes, gastrointestinal reactions, so try to use it with caution during breastfeeding. If you must take it, you need to take it under the guidance of a doctor. Because it contains chlorpheniramine, due to the discharge from the breast milk, with M single-point receptor effect, lactation may be inhibited by the effect, so breastfeeding women should be used with caution.