I originally was prescribed Nifedical XL 30mg it seemed to work. When I picked up my prescription renewal I failed to notice the different name (Nifedipine ER) but when i began taking it a few days later i noticed the size, shape, and possibly dosage difference. What i was given was/is Nifedipine ER Osmotic Relea(se) 90 TB24. I looked it up and Nifedipine and Nifedical are the same drug, but I am concerned if this dosage is 3X what the previous one was or is it just measured differently or? And why the change? I am going to the pharmacy today and discuss it with them. I have been taking the new medication for about 2 weeks. I read that this medication may create leg cramps. Is this true and would tight thy muscles be a reaction too?