We have flown 3 RTs so far this year and have never experienced any trouble carrying on medications. Each time I carried a full size bottle of Children's Tylenol on with me; not to mention the 14 oz bottle of hydrocodone cough syrup! The TSA site exempts all liquid medications from the 3 oz rule. (Recent London terrorists were doctors.
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TSA -To ensure the health and welfare of certain air travelers, in the absence of suspicious activity or items, greater than 3 ounces of the following liquids, gels and aerosols are permitted through the security checkpoint in reasonable quantities for the duration of your itinerary (all exceptions must be presented to the security officer in front of the checkpoint):
Baby formula, breast milk, and juice if a baby or small child is traveling;
All prescription and over-the-counter medications (liquids, gels, and aerosols) including KY jelly, eye drops, and saline solution for medical purposes;
Liquids including water, juice, or liquid nutrition or gels for passengers with a disability or medical condition;
Life-support and life-sustaining liquids such as bone marrow, blood products, and transplant organs;
Items used to augment the body for medical or cosmetic reasons such as mastectomy products, prosthetic breasts, bras or shells containing gels, saline solution, or other liquids; and,
Gels or frozen liquids needed to cool disability or medically related items used by persons with disabilities or medical conditions.