How long for alcohol to affect INR?

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mecretired

mecretired

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I am planning on going to the local winery tomorrow. I know there is a lot of discussion/disagreement about whether alcohol affects the INR or how (increase or decrease). My question is this--if the wine does affect my INR, how long will it take? I know a change in warfarin takes about 3 days to affect the INR. Would the alcohol effect be immediate or would it take some days? I have done a lot of reading and can't find anything on this subject (how long it would take). I am having my INR checked on Tuesday. Thanks for any input you may have. Mary
 
Some people here have reported their INR raises if they drink and some report it lowers. Others no change........

It is impossible to predict how your body will react but were it me, I'd go and have a good time. I took coumadin briefly after tissue valve replacement and all my doctors approved a glass or two of wine. None had any issue with moderate enjoyment of wine.
 
I've just come back from a great afternoon at the winery. We had a great lunch, live music and we shared just 1 bottle of wine. I had about 2 1/2 glasses. I have my INR checked Tues and will get INR results on Wed am. I will let you know if my INR is out of wack. Thanks again. It really is so comforting to know that I have all of you out there to answer questions, etc. Hopefully, one day I will have enough time and experience behind me that I will be able to help. Mary
 
Alcohol?

Alcohol?

Monitor, monitor, monitor...

As others have indicated, it varies among individuals. I did some drinking at a family wedding on Saturday. I'll probably run an extra check on my INR on Monday just to see where I'm at.

-Philip
 
I'm not self-testing yet--wish I were. I've spent several weeks with Roche and my ins company going thru hoops. I think they will pay but I just haven't gone thru enough hoops yet. So I'm still at the mercy of the lab and the coumadin clinic.
 
Thanks for letting us know. How good you now have an idea how your body will process that quanity wine and can relax and enjoy in the future. :)
 
Keep in mind that it takes 24 hours for alcohol to get absorb into ones system.
To have gotten an actuate reading if the wine had affected your INR you should have tested Monday morning. (I know Monday was a holiday)

Getting test results a day later is really unacceptable. I'm not going to get into this as there are other threads on this topic.
 
I haven't done my alcohol/INR study yet (but will be soon now that I have a home testing kit). But all indications (from my INR readings at the dr. office after drinking a couple days before) are that it doesn't affect my INR much, if at all.
 
Personally, I have doubts that Alcohol has ANYTHING to do with the Vitamin K/Vitamin K Agonist process that makes Warfarin useful as an anticoagulant.
Until I had an epiphany a few minutes ago, after reading other postings about 'drink today' 'test in three days', I joked about sharing a bottle of wine and having my dosage set for that alcohol input -- and having to keep drinking so my INR is stable.

Now, I'm thinking that this kind of thinking about alcohol is wrong.

Alcohol is quickly absorbed by the stomach and enters the bloodstream within minutes of drinking it. Your brain feels the effects very quickly. If it's in your blood, I suspect that the effects on clotting will be almost as rapid.

There are many drugs that can impact your clotting much more rapidly than Warfarin (think Heparin or Lovenox, for example), and if Alcohol has an effect on your INR, I'm assuming that it does so in a non-warfarin-like way. The effects on INR are probably much more immediate, and probably somewhat temporary.

I'm thinking that, if someone really wanted to see what kind of effect alcohol has on INR--and they had a meter and a dozen or more test strips they don't mind burning through, they would do a test like this:

Before taking that first drink, test your INR.
In the middle of that bottle, or when you're partway through with your drinks, or whatever, take another test.
When you're finished drinking, test again.
Then, test again every 30-60 minutes for the next hour or two (or three),
Finally, I'm thinking, test at 3, 6, 9, 12 hours. If there's a consistent difference from your pre-alcohol tests, continue until your INR is back within .1 or .2 of your pre-drinking values. I suspect that if there ARE any differences as a result of alcohol consumption, that the difference will spike fairly rapidly, then taper down gradually until they reach your pre-test INR.

Be careful, too, not to confuse the results by taking other things that may also have more rapid effects on INR during that time (no aspirin, which would be a pretty dumb thing to take before drinking, anyway, because you don't want stomach bleeding, for example).

----

Testing for results of alcohol on INR after the alcohol is completely out of your system probably would show NO CHANGE.

---

Is anyone up for this testing routine? Can anyone afford to burn through 6-12 strips in one day?
 
Alcohol itself is an anticoagulant.
It also has a dehydrating effect on the body, which can raise INR.
Undoubtedly your test idea would be interesting, similar to the tests the police do from time to time to illustrate the impact of drinking on one's blood alcohol level and ability to do simple tasks.
Absolutely once the alcohol is out of your system in a day or two, the effect on INR is past.

But it's also a case of raising the INR combined with the natural anticoagulation properties of alcohol. Just like using aspirin with warfarin, or with alcohol, there's a cumulative effect. And it may not all show up in the INR. For instance, right now I've been on both warfarin and lovenox post surgery, trying to get back in theraputic range. I'm also on baby aspirin. But my INR hovered around 2 for weeks. Today I'm finally theraputic.

Needless to say, I'm not adding alcohol to this mix. I'll be happy tomorrow when my last lovenox shot gets out of my system. Next week I may have an occasional glass of wine. The key is not to over do it.
 
I was a bit concerned about someone actually being ABLE to run a successful test if this person had too much alcohol in the system. (Those strips have really small areas for putting the blood).

It would be interesting to see how much anticoagulation can be caused by alcohol -- would someone with a 2.5 suddenly wind up with a dangerous 6 after drinking a couple bottles of wine? Would a six pack of beer raise an INR from 3 to 5? In other words, would (or could) a LOT of alcohol over a short period of time actually raise an INR to unsafe levels? (Of course, driving while drunk is an awful idea - but doing so with a dangerously high INR would be even worse).

I'm not convinced that the effects of drinking would, long term, be cumulative -- except for the fact that too much drinking could possibly damage the liver, and THAT could cause the INR to climb. (Coincidentally, CSI New York last night had a case where a hepatotoxin (liver toxin) damaged the liver and caused the INRs to climb so high that people died of internal bleeding - so I guess cumulative effects of alcohol on the liver MAY eventually raise INR secondary to liver damage).

I think my test, should anyone want to try it, could help shed light on what the actual effects of alcohol (in somewhat limited amounts, I'm guessing) are, right after drinking and for the next few hours. Can a few drinks raise INR more than a few points?

I may have some extra strips, but I have enough trouble getting the blood on the CoaguChek PT strips when I'm SOBER, and my supply of ProTime strips is diminishing, so I'm not sure I'll be able to do the test I suggested.
 
I'm still new to all this (4 mos) and still naive about it, I guess. That being said, I really do NOT understand why "the powers that be" don't know EXACTLY how and when alcohol will affect the INR. Alcohol and Warfarin are neither one new and they know how and when a doseage change in Warfarin will affect the INR--so why don't they know more about the effects of alcohol on the INR? Andy, I'm anxiously awaiting your study results. Maybe you can publish them and make some big bucks!
 
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