Started 30mg time release nifedipine couple weeks ago for Raynaud s Syndrome. Working well. Relief Day 1. BUT - 1st day experienced vertical diplopia about 5 minutes/recovered. Nothing since. Now, daily drowsiness, feeling tired is irksome because I ve been doing well losing weight, gradually, steadily, and walking at a decent pace is part of what has been a positive experience. Now, feels like I m un-retired and back at work. :-]