zig
0

Notifications

  • You're all caught up!

Side Effects of Vitamin D Overconsumption and Its Interaction With Other Drugs

by
author image Matthew Busse
Matthew Busse has pursued professional health and science writing since 2007, writing for national publications including "Science Magazine," "New Scientist" and "The Scientist." Busse holds a doctorate in molecular biology from the University of California-San Diego.
Side Effects of Vitamin D Overconsumption and Its Interaction With Other Drugs
A woman is holding supplement pills. Photo Credit Kwangmoozaa/iStock/Getty Images

Vitamin D is a fat-soluble vitamin that is produced by the skin after exposure to sunlight and is present in a small number of foods. If you are taking vitamin D supplements, you need to pay close attention to the dose you are taking, because taking too much vitamin D can cause serious side effects and interactions with other medications. The National Institute of Medicine has set a tolerable upper intake level of 100 mcg per day, which is equivalent to 4,000 IU. Like all health supplements, you should only take vitamin D with your doctor's approval.

Effects on Drug Activity

Vitamin D can affect how certain drugs are absorbed by the body or activated inside the body. Atorvastatin, often sold under the brand name Lipitor, is a widely used cholesterol-lowering medication. Vitamin D appears to decrease absorption of atorvastin by the body, which can decrease the activity of atorvastin and lead to higher cholesterol levels in the body, reports MedlinePlus. Calcipotriene, sold as Dovonex, is a synthetic version of vitamin D used to treat psoriasis. Because vitamin D and calcipotriene have very similar effects on the body, taking both at the same time can lead to symptoms of vitamin D toxicity.

Heart Medications

Several heart medications can be affected by vitamin D. Vitamin D increases absorption of calcium by the body. High levels of calcium can affect the heart. Taking large doses of vitamin D can increase the activity of the drug digoxin and result in an irregular heartbeat. In contrast, large doses of vitamin D can decrease the activity of two angina medications, diltiazem and verapamil. Decreasing the effectiveness of these drugs may increase the risk of angina and high blood pressure, explains Medline Plus

Diuretics

Diuretic medications, also known as "water pills" are used to treat high blood pressure. One side effect of diuretics is increased levels of calcium in the body. Vitamin D also increases calcium in the body, and taking diuretics with high doses of vitamin D can raise calcium to dangerous levels.

Liver Metabolism

The liver is responsible for metabolizing many drugs. High doses of vitamin D can increase liver metabolism, causing medications to be broken down and removed from the body faster than normal. Several medications may be affected by vitamin D in this manner, including triazolam, indinavir, estrogen, cyclosporine and lovastatin.

Vitamin D Toxicity

Overconsumption of vitamin D can lead to several harmful effects on the body, some of which can be quite severe. General symptoms of vitamin D toxicity include nausea, vomiting, appetite loss, dry mouth and an unusual metallic taste in the mouth. Headache, drowsiness, weakness and fatigue may also occur. Long-term ingestion of large doses of vitamin D can cause calcium levels to rise in the body. High levels of calcium can cause calcium deposits to form in organs and blood vessels, causing damage that can lead to heart disease, kidney stones or other health conditions.

LiveStrong Calorie Tracker
THE LIVESTRONG.COM MyPlate Nutrition, Workouts & Tips
GOAL
  • Gain 2 pounds per week
  • Gain 1.5 pounds per week
  • Gain 1 pound per week
  • Gain 0.5 pound per week
  • Maintain my current weight
  • Lose 0.5 pound per week
  • Lose 1 pound per week
  • Lose 1.5 pounds per week
  • Lose 2 pounds per week
GENDER
  • Female
  • Male
lbs.
ft. in.

YOU MIGHT ALSO LIKE

Demand Media

Our Privacy Policy has been updated. Please take a moment and read it here.