My vet always gives antibiotics in a syringe (no needle) of paste. Break a notch off the stem of the "plunger" and that's the dose. Quick squirt in cat's mouth and they virtually can't spt it out. If that's too hard I just smear it on or around their mouth or on their feet. Then they have to clean it of by - yep, you got it - licking.
No more problems.
Ask for paste form med's. Much easier.