Ignoring their effects, whether it s not preparing for them before they occur, or not paying attention when they do occur, can really hurt you. Also tell them if you smoke, drink alcohol, or use illegal drugs. Site users seeking medical advice about their specific situation should consult with their own physician. Ask your doctor or health care professional how to gradually reduce the dose. What is Isoptin In a class of drugs called calcium channel blockers. By the time symptoms are felt, serious damage may have already been done to body structures such as blood vessels, the heart, eyes, or brain.