I just threw out a bottle of expired tylosin. Someone told me that I should have kept it because it gets stronger after it expires and use simply use less. To me, that sounds strange. I know that most drugs are ok for some time after they expire. I just do not like to take chances with the animals and the antibiotics. Has anyone ever heard this? If so, how do you know how much less to use if the strength of the medicine continues to increase?