Urgent! 3 Week old Duck suddenly cannot walk!

[Iamgrateful]

Please help! We have two 3 week old Pekin ducklings. This morning I went to check on them and one of them cannot stand up and keeps falling over onto its back when it tries to walk. Please help!!!!!! I have no idea what to do as there are no vets that will care for ducks in my area. I am so scared!

 

[Iamgrateful]

I have a powder antibiotic that I had for my chickens - Duramycin-10. Should I give them some of that?