What is the most important information I should know about Zemplar?

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Do not take Zemplar (paricalcitol) if you are allergic to the ingredients in it, including vitamin D. Do not take Zemplar if you have high levels of vitamin D or calcium in your blood. Your doctor can confirm this with a blood test.

You may experience side effects when taking Zemplar, some of which can be serious. Before you take Zemplar, tell your doctor about all of the prescription medications, over-the-counter medications, vitamins and herbal supplements you are taking.