title: Vitamin D deficiency: appropriate replenishment therapies and the effects of vitamin D toxicity.
abstract: An 84-year-old patient diagnosed with a vitamin D deficiency was given a prescription for ergocalciferol (vitamin D2) 50,000 units weekly. The prescription was incorrectly filled for ergocalciferol 50,000 units daily. Incorrect therapy continued for two months. The patient's vitamin D level increased from < 7.0 ng/mL to 100 ng/mL over a six-month span. The patient complained of decreased appetite and significant weight loss and presented with an elevated International Normalized Ratio at a pharmacist-run anticoagulation clinic. In conjunction with the physician, the pharmacist discontinued vitamin D therapy and monitored levels.Vitamin D plays an integral role in the body's ability to absorb calcium and regulate calcium homeostasis. Further benefits have been reported regarding the role of vitamin D in muscle strength, cardiovascular health, and in preventing osteoporosis and falls. Vitamin D deficiency is widespread in the older adult population as a result of low dietary intake, decreased sun exposure, decreased intrinsic vitamin D production, and decreased vitamin D receptor activity. Replenishment using high-dose ergocalciferol is one common replenishment therapy. Patients also are able to supplement with nonprescription vitamin D products of varying strengths. While many older patients can be expected to have vitamin D deficiencies, pharmacists should be aware of appropriate replenishment therapies and correct dosing of different vitamin D products. Pharmacists also should be familiar with possible toxic effects of vitamin D, particularly as public awareness of benefits continues to increase.
authors.affiliation: Stanford Hospital and Clinics, Stanford, California, USA.
authors.forename: Sean
authors.initials: S
authors.lastname: Carlton
authors.forename: David
authors.initials: D
authors.lastname: Clopton
authors.forename: Kimberly A
authors.initials: KA
authors.lastname: Cappuzzo
mesh_terms: D000369:Aged, 80 and over; D001066:Appetite; D004305:Dose-Response Relationship, Drug; D004872:Ergocalciferols / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D019934:International Normalized Ratio; D014808:Vitamin D Deficiency / Q000188:drug therapy*; D014815:Vitamins / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D015431:Weight Loss / Q000187:drug effects
chemical_list: D004872:Ergocalciferols; D014815:Vitamins