CommunityDosing & Titration

AFIB episode on Retatrutide

18 replies9 peopleMay 16, 2026☆ Follow
Summary

Can retatrutide trigger AFib or heart rate spikes in people with prior episodes?

Several users report new or more frequent AFib episodes after starting low-dose retatrutide, often set off by ordinary triggers like certain foods or minor stress. Some switched back to tirzepatide and saw the issues resolve. Electrolyte intake, especially magnesium and potassium, helped a few people reduce palpitations, while others could not use those supplements due to kidney conditions. One person with a long-ago AFib history described a fall-induced episode that resolved without ER care after cardiologist guidance.

What this discussion establishesWhere people disagree

Whether daily magnesium or potassium is worth trying when AFib history exists; some saw benefit while others with CKD saw none or faced restrictions.

Still open

How much the prior weight or autoimmune history versus the drug itself contributed to the reported episodes.

Nothing here is advice.

18 replies · 9 people
AmberTimber37archiveopening postMay 16

62M, former athlete. Holding steady around 192 pounds, down from 262. Still strong and able to move slowly despite several autoimmune conditions that originally triggered AFIB thirty years ago. No episodes since then until recently. While working on the moving truck I fell about six feet from the cab. Building a platform for the puppy, I missed the step, hit a tree with my headphones, then the truck, then the ground. Got banged up but the multiple impacts kept me from breaking anything. Heart jumped straight to 160 and stayed there. I stayed on the ground half an hour trying to calm it. Watch showed AFIB with a high rate that slowly dropped. Next night, a little over twenty-four hours later, it went back to steady sinus rhythm in a hot shower with that sudden relief feeling. No trouble since. The adrenaline from the fall clearly drove the rate up. Haven't had any AFIB since then.

BlueSignal97archiveMay 16

Even half-milligram weekly doses seem to set off AFib from tiny triggers like tomato sauce or eating close to bedtime. Those things never caused issues before I restarted small amounts after stopping for back pain tied to the gallbladder. Not claiming cause and effect, but it lines up oddly. This reading came at five in the morning after spaghetti and meatballs with sauce the previous evening. Two hundred milligrams of the usual med brought it down after a couple hours.

LevelSignal24archiveMay 16

AF tends to show up more when the body is in a high-adrenaline state. At sixty-two and after years of extra weight it is hard to know if the same fall would have caused AF without the medication. Might be worth looking at the other option instead, since it does not appear to raise sympathetic drive the same way.

RustBeacon82archiveMay 16

Had heart-rate problems on a low dose. Spikes into the one-thirties and one-forties while just sitting and watching TV. Switched back to the other medication and everything returned to normal.

QuietSignal61archiveMay 17
↳ replying to @AmberTimber37 (opening post)

Question for the three of you: are any of you taking magnesium or potassium every day? What supplements do you use, and do any target heart health in particular?

BlueSignal97archiveMay 17
↳ replying to @QuietSignal61

None at all. Just the beta blocker, the anti-arrhythmic twice a day, and the anticoagulant. Tried magnesium earlier and noticed no change. Before starting this medication I only had AFib a few times a year. Also rely on the CPAP machine.

QuietSignal61archiveMay 17
↳ replying to @BlueSignal97

That sounds rough. At minimum add two hundred milligrams of elemental magnesium from glycinate each day. The common brands are fine. The anticoagulant was an experience for me after an embolism a few years ago. Needed samples because the doctor did not believe how it happened. Took it three months along with plenty of other things. If a blood thinner is required, omega-3 is often suggested too. Liquid versions are inexpensive. Brushing does not always show immediate results but it still matters a few times a week. Skipping supplements entirely seems risky to me.

CopperSignal27archiveMay 17

This sounds like a situation that calls for a cardiologist's view and full disclosure about the medication. Given the reports of raised heart rates and occasional panic-like feelings, an arrhythmia is not surprising because sympathetic activity and pulse both go up. Nothing in the account suggested medical care was sought. A rate of one-sixty during AF is high enough to reduce pumping efficiency and could lead to heart failure if left that way too long. Going straight to an emergency department seems the safer choice when this has not happened repeatedly under medical supervision. Older approaches focused on rate control, but more attention now goes to restoring normal rhythm.

RustBeacon82archiveMay 17
↳ replying to @QuietSignal61

No supplements beyond ordinary daily vitamins. Low blood pressure and heart rate my whole life until this medication. Staying with the other one from now on. Never needed anything for the heart before.

LevelSignal24archiveMay 17

One of the late-stage trials is focused on people who already have cardiovascular disease. The company would not run it without expecting an overall benefit, though it may not suit everyone. Atrial fibrillation will probably appear in the data even if the net effect lowers risk. The other medication does not seem to carry the same issue and has already shown it can reduce AF burden.

BlueSignal97archiveMay 17
↳ replying to @QuietSignal61

Tried magnesium years ago. Chronic kidney disease now prevents experimenting with it or several other things. Used it before for bad muscle cramps with no relief. Cannot take omega-3 because of the blood-thinning effect. Appreciate the suggestions but I am fine without them. Still interested in the peptides though.

SharpAlder17archiveMay 18

Pretty bad palpitations after one week. The monitor flagged AFib, flutter, and almost everything else, though it has been inaccurate before. Magnesium did not help this time. Electrolyte mixes containing both magnesium and potassium worked well, better than in years. A potato or banana might have done the same.

QuietSignal61archiveMay 19
↳ replying to @SharpAlder17

Potassium made the biggest difference for me. At least a gram a day. Also had to stop nicotine and caffeine.

AmberTimber37archiveJun 1

Sorry for the delay. I have a cardiologist and reached out right away. We discussed how catecholamines from the injury drove the high rate. He was not surprised by the watch reading and told me to go to the ER if it did not settle fast, since both natural and electrical reversion work best inside forty-eight hours. I skipped the ER because the rate kept trending down and hitting normal ranges more often. Chose to wait a little. Asked about stroke risk and was told the immediate danger is fairly low. Took aspirin. AFib stroke risk builds over time. No problems after it reverted. Not using magnesium or potassium pills but regularly drink an electrolyte mix with modest amounts. Been loading and unloading the truck the past two weeks with normal heart function. As a former athlete and racer with a zero calcium score I do not get chest pain yet when pushing during exercise. Might do further checks later.

QuietAnchor73archiveJun 1
↳ replying to @SharpAlder17

A medium banana has roughly four hundred fifty milligrams of potassium. A medium baked potato with skin has about nine hundred twenty-six milligrams. Did not realize the potato had more.

QuietAnchor73archiveJun 1
↳ replying to @AmberTimber37

Take half a baby aspirin daily for no particular reason. Guidelines suggest it for ages forty to fifty-nine with higher ten-year risk but not for those sixty and older without prior heart disease because of bleeding concerns. By sixty most of us probably have some degree of heart disease anyway.

IronKettle76archiveJun 3
↳ replying to @SharpAlder17

What dose were you on? Late fifties here and had an ablation in twenty twenty-one. Starting this medication very slowly. A clip discusses adding taurine while using it.

SharpAlder17archiveJun 3
↳ replying to @IronKettle76

Started at one milligram twice a week. Now around six milligrams weekly total. Last increase came too fast and brought palpitations back. Agree that slow titration matters. The final amount itself is not the issue, just how quickly I get there. Will look at the taurine video, thanks.

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