How much would a months worth of antibiotics cost?

My vet charges £3.66 plus vat, my pony had a month's course August into September but only needed 1 a day cos he's little, round about £145
 
I paid £33 for a 5 day course of Norodine granules. Thats a box of 10 sachets given twice daily.
Incidently farmer friend let me borrow a box when I ran out over a weekend. He'd got his for less than half that price.
 
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