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Hi. Zanaflex is short acting medicine and dosed very 8 hours. Manufacturer has no studies human milk excretion of this drug.
My suggestion to you is that you can feed the baby 6 hours after the dose and at other times feed a formula for few days. you can also do the pump and store it.
if pump and store, please read articles about breast milk storage at Medlineplus and follow all precautions. If you accept this answer, please rate my service by clicking on the stars.
You can also find good articles about breast milk storage at mayoclinic.org
I mean to say that if you need to feed the baby every 3-4 then you can feed formula inbetween your 6 hourly breast feeding
Yes, most of it will be out
As the drug is fat soluble, it can still appear into the breast milk but the effects on the infant are not listed.
I will say the best solution will be to store milk and then take the dose right away and do not pump the milk for next 8 hours. And also increase the interval between drug dosing to 12 hours. That way there will be less cumulative effect and much less chance of appearing it in the milk