I am taking Verapamil now for 6 months. I took 40mg/day for 5 months will no problem, except some minor tiredness. About 3 weeks ago, I raised the dose to 60mg/day, and 2 weeks ago I started itching like crazy. My main itching is in the buttocks, legs, elbows, back and abdominal area. Could the additonal 20mg/day have caused this ?