55 year old Caucasian woman not obese has the symptoms of osteoporosis. Her doctor prescribed a large dose of ca with different formulas and vitamen D3 . Weeks after starting the medicines fasciculation appeared . My advice as pharmacist was to make ca serum analysis the serum analysis was normal . fasciculation decreased with kcl syrup .question here what is the relationship between k and ca and fasciculation .second question in postmenopausal woman should I give ca supplement although ca serum level is normal .third question what is the reason of fasciculation ?