I really feel for you. DD now 4 has always hated taking her anti-convulsants and used to hit and kick out and spit it out and it was awful.
I tend to agree with purple that you have to be really tough and just get it done with force.
That's what we did, and I used to give it when she was wrapped up under my left arm and either she'd be wrapped up in a towel or dh would hold her other arm down.
I have to admit there have been times when I've gently squeezed her cheeks to force her to swallow the drugs and then I always give a drink of water straight after.. I sing loudly sometimes,, her favourite song of the moment, or sometimes just as her favourite programme is coming on and give masses of cuddles and 'well dones' and 'clever girls' afterwards..
During getting the drugs in I sometimes also say 'mummy loves you and I know you hate me for doing this but we have to do it.. ' but I think this is for my benefit as much as hers!
We had to give a weeks worth of foul tasting anti biotics and liquid steroids which were so bitter and she hated me all week.. and they haven't bloody worked anyway!!
Having said all that she now seems resigned to the anti convulsants and seems to accept these 3 drugs without too much of a fight so when she's otherwise well we no longer have any major battles over drugs. But it took a while to reach this point. Don't give up hope!
Sorry for long reply but really feel for you. It's really hard but you have to find a way of taking control and not take personally all the protesting.. You are just being her Mum, taking care of her.. Good luck.