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You should start with a deworming. Follow it with a bug check and possible delousing. If you have to delouse then you are going to need to do a coop cleaning, and then re-do the delousing and coop cleaning a second time after 10ish days.
The foot? If you are not seeing a concrete reason for the limp, then let it slide a few days. Chances are it will go away on its own. Leg/foot problems are frequent and often fleeting in poultry. That's what happens when a creature is always on its feet.
Oh, and I forget my manners...Welcome to BYC.
You will need to discard any eggs for 14 days after treatment. Wazine comes through in eggs, so the eggs need to be tossed- not eaten, not given to pets for consumption- thrown away.
I never use antibiotics unless I am sure there is a reason to do so. Since you have started a course, though, you must finish the course to prevent breeding antibiotic resistance.