By Bob Semro Prescription drugs are a big part of the monthly budget for many seniors on Medicare, and provisions in the Affordable Care Act (ACA) are working to lower those costs. In 2011, 3.6 million Medicare recipients nationwide saved $2.1 billion in prescription drug costs, according to estimates released last week by the Department of Health and Human Services (HHS). In Colorado, 39,746 Medicare recipients saved $22.8 million on prescription drugs, or $579 per person on average, according to these estimates. HHS projects these savings will increase over time totaling nearly $4,200 for the average Medicare recipient by 2020….