Examples: For a 6-lb. Large Fowl Leghorn rooster, 2 times per day give 1/2 of a regular aspirin ( = ~300 mg total per day).
For a Bantam 1.6-lb. Bantam Leghorn rooster, 2 times per day give 1/2 of a baby aspirin (= ~75 mg total per day).
To give immediately or in individual administrations: Crush up and split dose up into 2 or 3 administrations per day. Sprinkle the powder on a small tasty treat such as fruit or yogurt and give to the chicken.
To have the chicken self-administer throughout the day: Crush up the total daily dose and dissolve in the approximate amount of water that the chicken drinks each day. Pour into chicken's drinking container.
Never give a chicken any kind of painkiller with 'caine' in the name. These are EXTREMELY toxic to chickens.
Do NOT use a Triple Antibiotic Ointment with Painkiller because almost all include '-caine' ingredients.
Exception: Neosporin with Painkiller products usually only use Pramoxine HCl as the painkiller ingredient, and that is alright for chickens.