Look at feed stores in the cattle meds for Tylan 50 or Tylan 200, and get syringes with 18 or 20 gauge needles to withdraw the medicien. Give it orally after removing the needle. They have been reportedly hard to find this year. How much does your hen weigh? Tylan 50 dosage is 1.25 ml or 1 1/4 ml for a 5 pound hen 3 times a day for 5 days. Tylan 200 dosage is 0.25 ml or 1/4 ml for a 5 pound hen 3 times a day.
Go to Walmart pharmacy and ask for a couple of 1 ml syringes with needles. They also have free 1 ml syringes without needles for giving babies small amounts of medicine. I just got 2 of those a couple of weeks ago. They keep them behind the counter, altough they have larger 5 ml ones out in the aisles.