I take it without a problem. Every time I feel a cold coming on, I take it for a few days. You can check with your pharmacist too if you're not sure.

I called the pharmacist. She wasn't the nicest. She told me to read her the ingredients in emergen-c because she didn't know. I know it's otc medicine but it's pretty common. She still wasn't helpful even after I informed her of the ingredients

She 's a jerk. The whole point of asking is that you're not sure if the ingredients would have an effect. I would say sometimes you get better results in person vs over the phone but still.

Yeah you're probably right. It was a very bad move customer service wise on her part. I never get the best service at CVS though.

Craziness! I've never gotten that kind of rude service when I call to check on warfarin interactions. The pharmacists are usually quite nice and accommodating, especially since they know what a dicey drug warfarin can be. Definitely bad customer service.

(P.S. RMB gave you the same advice I would have ... hopefully you got the question settled to your satisfaction! Hopefully, you don't get sick!)

I take Sambucus Black Elderberry Extract at the first sign of a cold and I feel it works. There's no interactions with warfarin listed at:
http://www.rxlist.com/elderberry-page3/supplements.htm#Interactions

That list does contain the word 'others' but warfarin is such a common drug I think it would be mentioned.

A cup of raw Elderberries has a moderately high amount of Vit K in it----- so it might affect your INR. I have no idea of how a teaspoon of the extract compares with raw berries though.

Since I don't take it every day or even very often I doubt if it would have any long lasting effects on my INR.

I've had no issues with Emergen-C (one packet per day) ; )

I've taken it without any issue.

Thanks for all the answers. I've been taking it once a day but my cold seems to be getting worse. I may start taking it twice a day.

Emergen C isn't a sure fire way to prevent or get rid of a cold. It seems to help me sometimes and other times, nothing. So it could just be you're stuck with what you have.

I probably wouldn't take more than two a day since you have to remember doing so is probably taking more of a recommended dosage of a lot of those vitamins and minerals. I get sick to my stomach if I over do it.