Medicare says premiums for prescription drug plans will rise in 2015 for the second year in a row. Officials said Thursday that Medicare's average monthly drug premium will rise next year to $32. The modest increase of $1 a month comes amid worries over the future impact of costly new medications. Sovaldi, for example, cures hepatitis C but costs $1,000 a pill. Most Medicare beneficiaries have prescription drug coverage. But consumers should pay attention because the average premium says little about what any one person pays.