Ergocalciferol (Vitamin D2) is a prescription vitamin used to prevent or treat Vitamin D deficiency, particularly in individuals who may not get enough from sunlight or diet. It belongs to a class of medications known as Vitamin D analogs, which help the body utilize calcium more effectively. Unlike over-the-counter Vitamin D3 (cholecalciferol), ergocalciferol is the plant-derived, inactivated form of Vitamin D.
Ergocalciferol increases calcium absorption in the gut and maintains adequate serum calcium and phosphate concentrations, supporting normal bone mineralization and overall health. For the medication to be effective, it is important to maintain sufficient calcium intake through diet or supplementation.
How to Use:
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Typically dosed as one capsule weekly, or as prescribed by a healthcare provider
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May be taken with or without food
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Ensure consistent calcium intake while using this medication
Warnings:
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Vitamin D effects can persist for over 2 months after stopping therapy
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Over-supplementation can lead to hypercalcemia (high calcium levels)
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Serum levels should be monitored, with many experts recommending a target range between 20–40 ng/mL