Possible side effects of taking cholecalciferol include skin rash, difficulty swallowing, hives and dizziness, according to Drugs.com. Other possible side effects include itching, fast heartbeat, coughing and irregular weakness or tiredness.
Some people may experience swelling or puffiness around the tongue, eyes, lips or face after taking cholecalciferol, notes Drugs.com. Other possible side effects include irritability, increased urinating frequency, chest pain and shortness of breath. Some people may experience behavior changes or cognitive problems. Signs of an allergic reaction to cholecalciferol include swelling of the face, tongue or throat, hives and difficulty breathing. Early signs of an overdose include a metallic taste in the mouth, weight loss, vomiting and nausea. Other signs of an overdose include weakness, constipation and pain in the bones or muscles.
If side effects do occur, a health care professional should be contacted immediately. People who have high vitamin D or calcium levels should not take cholecalciferol. People who have health conditions that make it difficult for the body to absorb nutrients from food should not take cholecalciferol.
People who have had an allergic reaction to vitamin D in the past should not take cholecalciferol. Those who have an electrolyte imbalance, kidney disease or heart disease should speak to a physician before taking cholecalciferol. Pregnant or nursing women should speak to a doctor about recommended doses. Cholecalciferol should only be taken in the doses recommended by a doctor, for the appropriate amount of time.