Vitamin D2 Side Effects

Common side effects of ergocalciferol (vitamin D2) are listed below. Call your doctor for medical advice if they are severe or persist after a few days.

• Fatigue
• Pale skin

Vitamin D2 can also cause more serious side effects. Stop taking the medication and call your doctor without delay or seek emergency medical help if you develop:

• Severe fatigue or weakness
• Drowsiness
• Confusion or difficulty thinking clearly
• Nausea, vomiting, constipation, loss of appetite, weight loss
• Increased thirst or increased urination
• Body aches or muscle stiffness

The above list may not include all the potential side effects of vitamin D2. Contact your healthcare provider if your side effects are unusual or severe or do not get better over time. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Vitamin D2 Overdose: In case of an overdose of ergocalciferol (vitamin D2), call your doctor immediately. You can also call your local poison control center, provincial poison control center, or the national poison control center at 1-800-222-1222. Call 911 or emergency services if a person has collapsed, cannot breathe, has had a seizure, or cannot be awakened. Overdose symptoms may include weakness, nausea, constipation, loss of appetite, loss of weight, muscle stiffness, muscle aches, increased thirst, increased urinary frequency (especially at night), pale skin, confusion, and problems with thinking.

Source: FDA