What are the side effects of Calciferol?

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You may have a severe allergic reaction to Calciferol (vitamin D2). Symptoms of an allergic reaction, which require immediate medical attention, include: swelling of your lips, tongue or face; chest or throat tightness; difficulty breathing; dizziness or faintness; skin redness; or hives, rash or itching. Other side effects, requiring prompt medical attention, include: thinking problems, changes in behavior, feeling irritable, high blood pressure, chest pain, feeling short of breath, increased thirst, increased urination, irregular heartbeat, seizures or unusual tiredness.

Symptoms of a vitamin D overdose include: weakness, metallic taste in your mouth, weight loss, muscle or bone pain, constipation, nausea and vomiting. Minor side effects may include dry mouth, headache, loss of appetite and stomach upset. Your doctor may suggest ways to prevent or alleviate them if they persist or worsen.