WILLISTON PARK - Concerns are rising among pharmacy employees on Long Island over the rise in prescription drug addiction, which has been known to lead to pharmacy robberies. Pharmacist Anthony Bubolo, of Andrew's Pharmacy in Williston Park, says he's still on edge after his store was held up at gunpoint in January by two masked men demanding oxycodone and hydrocodone.According to Dr. Jeffrey Reynolds, the executive director of the Long Island Council on Alcoholism and Drug Dependence, addiction to prescription drugs has increased 300-400 percent this past year alone.He says addicts who are desperate often rob pharmacies, stealing painkillers which they later sell on the street for as much as $50 a pill.In light of this data, Sen. Charles Schumer (D-N.Y.) has proposed legislation that would toughen sentences for those convicted of robbing or selling prescription drugs, doubling the maximum prison sentence to 20 years.