Richard's Whole Foods  
10% Off Register online today and receive 10% off your next in-store purchase.
Your E-mail:     
Healthy Recipes Reference Library Store Specials About Us Friday, May 05, 2006
Search Site
Departments
Reference Library
  
Sign In
My Account
Contact Us
Shopping Cart
Checkout
Help


 
 
Table of Contents > Supplements > Vitamin C (Ascorbic Acid) > Interactions
Possible Interactions with: Vitamin C (Ascorbic Acid)
Also listed as: Ascorbic Acid
 

If you are currently being treated with any of the following medications, you should not use vitamin C supplements without first talking to your healthcare provider.

Aspirin and Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
Very limited research suggests that vitamin C may protect the stomach and intestines against injury from NSAIDs such as ibuoprofen. On the other hand, high doses of vitamin C (equal to or greater than 500 mg per day) may raise the blood levels of aspirin and other acidic medications.

Acetominophen
Vitamin C may decrease excretion of acetaminophen (a medication sold over the counter for pain and headache) in the urine, which may increase blood levels of this medication.

Diuretics, Loop
Animal studies suggest that vitamin C may amplify the effects of furosemide, which belongs to a class of medications known as loop diuretics.

Beta-blockers for high blood pressure
Vitamin C may decrease the absorption of propranolol, a medication that belongs to a class known as beta-blockers used for high blood pressure and other heart-related conditions. If taking vitamin C and a beta-blocker, therefore, it is best to take them at different times of the day.

Cyclosporine
Cyclosporine, a medication used for the treatment of cancer, may reduce blood levels of vitamin C.

Nitrate Medications for heart disease
The combination of vitamin C with nitroglycerin, isosorbide dinitrate, or isosorbide mononitrate reduces the occurrence of nitrate tolerance. Nitrate tolerance is when the body builds up a tolerance to the medicine so that it no longer has its desired effect. People taking nitrate-containing medications generally follow a 12 hours on, 12 hours off schedule to avoid this tolerance. Studies suggest that taking vitamin C along with nitrate medications may reduce the development of this tolerance.

Tetracycline
There is some evidence that taking vitamin C with the antibiotic tetracycline may increase the levels of this medication.

Warfarin
There have been rare case reports of vitamin C interfering with the effectiveness of this blood thinning medication. In recent follow up studies, no such association has been found with doses of vitamin C up to 1,000 mg per day. Because of these much earlier reports, however, some conservative clinicians suggest not exceeding RDA values of vitamin C (see earlier section entitled How To Take It). Whether taking recommended dietary amounts or larger quantities of vitamin C, anyone on warfarin must have their bleeding time measured regularly and followed closely using a value called an INR, measured at your doctor's office. If you take this blood thinner, any time you make a change to your diet, medications, or supplements, you must notify your physician.


Drug Interactions
Acetaminophen-containing Medications
Aspirin
Beta-blockers
Cyclosporine
Diuretics
Nitrate
Nonsteroidal Anti-inflammatory Drugs (NSAIDs)
Tetracycline
Warfarin

Copyright © 2004 A.D.A.M., Inc

The publisher does not accept any responsibility for the accuracy of the information or the consequences arising from the application, use, or misuse of any of the information contained herein, including any injury and/or damage to any person or property as a matter of product liability, negligence, or otherwise. No warranty, expressed or implied, is made in regard to the contents of this material. No claims or endorsements are made for any drugs or compounds currently marketed or in investigative use. This material is not intended as a guide to self-medication. The reader is advised to discuss the information provided here with a doctor, pharmacist, nurse, or other authorized healthcare practitioner and to check product information (including package inserts) regarding dosage, precautions, warnings, interactions, and contraindications before administering any drug, herb, or supplement discussed herein.

 
RELATED INFORMATION
Vitamin C (Ascorbic Acid)
  Uses of this Supplement
Allergic Rhinitis
Alzheimer's Disease
Asthma
Atherosclerosis
Breast Cancer
Burns
Cataracts
Cervical Dysplasia
Common Cold
Diabetes Mellitus
Eczema
Gallbladder Disease
Glaucoma
Hypercholesterolemia
Hypertension
Macular Degeneration
Myocardial Infarction
Obesity
Osteoarthritis
Pancreatitis
Parkinson's Disease
Photodermatitis
Skin Cancer
Stroke
Uveitis
Wounds
  Supplements with Similar Uses
View List by Use
  Drugs that Interact
Summary
Acetaminophen-containing Medications
Aspirin
Beta-blockers
Cyclosporine
Diuretics
Nitrate
Nonsteroidal Anti-inflammatory Drugs (NSAIDs)
Tetracycline
Warfarin
  Drugs that Deplete this Substance
View List
  Supplements with Similar Side Effects
View List by Side Effect
  Supplements with Similar Warnings
View List by Warning
  Related Articles
View Articles
  Learn More About
Nutrition
 

Home | Store Locations | Buy Online | Store Specials | About Us | Delicious Living | Reference Library | News & Features | Health Tools | Treatment Options | Healthy Recipes | Ingredient Glossary | My Account | Contact Us | Help | Shopping Cart | Privacy Policy | Terms of Use |



Powered By Living Naturally