Let's take a minute to talk about your medication. This is vitamin D 1.25 mg, which is equal to 50,000 international units. This medicine is also known as 'Vitamin D2' or 'ergocalciferol.' It is used to raise vitamin D levels in the body. It is generally well-tolerated. But, if you notice any changes in your body, like nausea, loss of appetite, constipation or weight loss, this could be related to this medication and you should tell your doctor right away. Some people may also require calcium while taking vitamin D, so ask your doctor about your calcium needs. It is important to know that this prescription dose of vitamin D must be closely monitored by a physician to avoid an overdose. For best results, take it exactly as prescribed, and follow your doctor's advice for lab work and monitoring.