People taking a widely used group of drugs known as calcium channel blockers to treat high blood pressure also appear to be cutting their risk of Parkinson’s disease, according to a new study. The study found people who were currently long-term users of calcium channel blockers to treat high blood pressure lowered their risk of Parkinson’s disease by 23 percent compared to people who didn’t take the drugs. There was no such effect among people taking ACE inhibitors, AT II antagonists and beta blockers.