@Mtnldy's GurlzI appreciate your post too, newhobbie. Did your vet give you the amount to administer for a gallon of water? I'm twisting my brain into knots trying to figure out what the instructions on the package mean.
I think most people wait two weeks, but call your vet and double check. If your vet doesn't know they can contact FARAD for you:I know this is an older thread but our vet just prescribed it to our entire flock after a farm visit which at the time had everywhere from a ouple week old chick to hens laying fertile eggs and pullets and everything inbetween. I forgot to ask egg withdrawal though that's why I came across this thread.
Welcome to BYC @MaevesFLock, excellent find there!After an outbreak in my flock I have been looking around for information about Sulfadimethoxine use in hens over 16 weeks. The packaging says it should not be used on them, however there are research papers online that shed light on residual antibiotics in eggs. Here is the one I found that seems to be very clear on the withdrawal time and use in adult hens:
"Sulphonamide residues in eggs following drug administration via the drinking water.
Roudaut B1, Garnier M.
The aim was to determine concentrations of sulphadimidine (SDM) and sulphadimethoxine (SDT) in eggs following oral administration through drinking water for 5 days (0.5 g l(-1) for SDT, 1 and 2 g l(-1) for SDM). Residues of sulphonamides in albumen and yolk were monitored by high-performance liquid chromatography with UV detection. The limit of quantification was 0.005 microg g(-1) for the two egg components. The results indicate that 0.9-1.4% of the dose administered was deposited in eggs. Maximum concentrations in albumen were much higher than those in yolk. More than 75% of the overall sulphonamides detected in eggs was concentrated in the albumen. The residue levels declined below the limit of quantification within 12-20 days for albumen and 14-15 days for yolk after treatment was discontinued.
PMID: 11962695 DOI: 10.1080/02652030110102836"
So 21 days would be the amount of time not to eat eggs, and your hen's eggs should be safe to eat after. Google scholar is a GREAT resource for looking at real research - type "Scholar" into the Google search bar, search on the topic, and then when you see a title that seems relevant, read the abstract and the results sections - that is where they summarize the findings.