After exposure to somebody that was positive for a few hours, before the jab was available, I went to the doctor. We discussed it at length.
Consultation cost with a course for a week, initial boost plus tab daily, was about R500 odd.
Dosage? Unsure as I did not have the tab analyzed. I trusted a professional for that that's seen me through some hairy situations many years. Let's say I was young starting off, he too, when we first met. Now we're both gray. So I think he did a good job.
You forgot to ask the doctor's ID number, address, shoe size ... anyway, I'm sure you can ask your vet since your seem to prefer that biased view.