The subject line says it all. Briggs 4th edition says "it is not known if chlorzoxazone is excreted into milk. No reports describing the use of the muscle relaxant during lactation have been located." Hales 4th edition doesn't list it at all. The baby is 7 days old. Mom is on medication for muscle spasms from epidural which went into the spinal base. Doctor plans to keep mom on medication another 3 days and recommends another 24 - 48 hours off before returning baby to breast. If this medication is not compatible with breastfeeding are there effective substitutes that are? Carla D'Anna (just north of Washington, DC)