Okay, after talking to my vet and the pharmacy this morning it turns out the pharmacist working last night screwed up. He didn't read the dosage correctly and quoted me a price for 4 times as much as needed. In the end a months worth of the liquid will cost me $11.99, much better. My pharmacy doesn't have the tablets and the big capsules are 10 times the dosage needed so I can't use them.

That pharmacist was an older man I've never seen before. He may need to consider retiring soon if he making those kinds of mistakes.