when DH is around one of us holds him down, or wraps him up in a sheet, whilst the other squeezes his cheeks together & puts the medicin in slowly so he doesnt gag on it. This is how the nurse showed us & have done it often as he was one sick little boy last yr & needed his medicine.
If I'm on my own....yep I'd go with the choc milk option....or anything he'll love. I used to put small amounts on his spoon when feeding yogurt or weetbix or something he was going to eat. Just now before his afternoon nap I put panadol in his milk due to an ear infection........luckily for me he'll take the antibiotic & ask for more!