CommunityDosing & Titration

Jogging on Shot Day

22 replies14 peopleMay 12, 2026☆ Follow
Summary

does tirzepatide or similar meds reduce energy for running or cardio on injection days

Users report mixed effects: some feel noticeably low energy and slower on shot days especially for evening runs, while others see little or no change after the first month or two. Those affected often describe needing to build volume back gradually, timing carbs around workouts, or adjusting schedules. Weight loss itself eventually improves recovery for several people even as doses increase.

What this discussion establishesWhere people disagree

whether the medication itself, calorie intake, or overall training volume is the main cause of reduced cardio performance

Still open

how long the initial fatigue typically lasts before the body adjusts

Nothing here is advice.

22 replies · 14 people
LevelSignal57archiveopening postMay 12

Anyone here who runs also on tirzepatide? I split my dose with 3.5 mg Tuesday morning and 3.5 mg Friday evening. My schedule has weights on Monday and Thursday, yoga on Wednesday and Saturday, and runs on Sunday, Tuesday, and Friday. Right now I am doing couch to 5k with four-minute run and two-and-a-half-minute walk intervals. The Tuesday evening run is the problem because I have zero energy and cannot hold pace. Has anyone else noticed cardio feels worse on shot days? I am 35, started at 240, now 213.

RustCompass19archiveMay 13

Fatigue like that shows up often on tirz, especially with low water or electrolytes, though it can happen even when those are fine. Running in a deficit also raises injury risk so be careful. I added BPC157 for that reason and it helped me. Some people mention mots-c for energy but I have not tried it.

LevelSignal57archiveMay 13
↳ replying to @RustCompass19

Good to hear it is not just me. I have not tried any stacking yet but I already have the oral version of BPC 157. Would that be enough?

NorthSignal43archiveMay 13

I am not really a runner but I like to get out for two miles on a workout day. Yesterday was day one after my reta shot and I was really slow.

CopperTimber28archiveMay 13

I run four days a week for a little over an hour and take tirz every six days. So far the shots have not changed my runs. I use NAD+ before each one and that seems to help a lot. Oral NAD is supposed to work too. Nice to see other runners here.

ClearCinder63archiveMay 14

Tirz hurt my cardio output quite a bit. Moving to reta improved it slightly. I had to treat myself as if I were in worse shape and slowly rebuild higher volume. Started with short intervals, added longer repeats, then one longer zone-two run each week from twenty minutes up to fifty. It took time but I got back to a decent pace.

BrightSignal52archiveMay 14

I only run a mile and a half to two miles daily since my diabetes diagnosis. Early on tirzepatide I felt more tired, but after the first five pounds came off my body adjusted and I actually recovered faster even while increasing the dose. Now I need to run farther to get the same cardio effect I had at the start.

ClearCinder63archiveMay 14

With couch to 5k, avoid raising distance, pace, or time by more than ten percent per week. The sluggish feeling is tough at first but sticking to a routine makes it easier to keep going. Losing nearly thirty pounds already is solid progress and you are probably feeling better already. It should keep improving as fat comes off and muscle builds.

LevelSignal57archiveMay 15
↳ replying to @NorthSignal43

Do you notice the same slowdown with weights or only with running?

LevelSignal57archiveMay 15
↳ replying to @ClearCinder63

Was lifting also harder or was it only the cardio that felt off?

LevelSignal57archiveMay 15
↳ replying to @ClearCinder63

Thanks, that is nice to hear. I am on week six of the plan but I stretch each week across two weeks so it stays manageable.

ClearCinder63archiveMay 15
↳ replying to @LevelSignal57

The main issue was cardio. Strength work felt about the same as usual. I also ride the bike for thirty to forty-five minutes or run for distance, pace, or time. Doubling the weeks sounds like a smart way to ease in.

WryHarbour43archiveMay 15

I have been on tirz four months and my shot day lands on my three-to-four-mile outdoor cardio day. Lately it has not bothered me, but the first month or so it was tougher. Were you already on this schedule before starting tirz? Tuesday looks rough anyway because of the Sunday run and Monday lift. Evening cardio after work is also harder for me than morning. If overall progress is fine I would probably just accept it. My Friday lifts are always weaker too so I ease off knowing it will be a grind. Couch to 5k got me running again after a back injury in my thirties and I suggest it to anyone starting or restarting.

PatientHarbour23archiveMay 15

I have been on tirz for a year and a half and added cagri plus reta last month. Running and cardio have stayed fine on all of them.

LevelSignal57archiveMay 16
↳ replying to @WryHarbour43

I was not exercising much before tirz. I figured if I am going to use the medication I should also eat right and move so I actually reach my goals. Does that make sense?

KeenKettle50archiveMay 16

I have never had any of those side effects. Not sure if that is good or bad.

RustSignal22archiveMay 16
↳ replying to @LevelSignal57 (opening post)

Why are you running, mainly for heart health or to burn calories? If it is the first, try eating carbs around the workout to fuel the run and recover. If it is mainly to cut calories, maybe focus on steps instead so you do not over-fatigue in a deficit. If it is both, carbs before the run would still help.

WryHarbour43archiveMay 16
↳ replying to @LevelSignal57

Going from almost no exercise to training most days is a big shift. The Tuesday run timing plus total weekly volume could explain the tiredness as much as the shot. If you are progressing without injury I would not stress over it. Also, eating less or skipping carbs on shot days can leave you flat for an evening run.

LevelSignal57archiveMay 16
↳ replying to @RustSignal22

I run because I genuinely enjoy it and used to do it before. I miss it. I can try the carb timing, thanks.

SteadyTimber22archiveMay 16

I almost ran a half marathon yesterday but talked myself out of it.

KeenHarbour69archiveMay 21
↳ replying to @LevelSignal57 (opening post)

I run about ten miles most mornings. My shot schedule and dose have not changed that much. I switched from reta to tirz recently so we will see. Sometimes I get reflux near the end of the run and tums beforehand stops it. I also take mots-c in the morning and electrolytes plus a two-hundred-calorie bar before heading out.

WarmMarble58archiveMay 22

With that much running you probably do not need to split tirz twice a week. Cardio on tirz seems to speed fat loss for me, almost like doubling the workout. Protein still matters for recovery and you should keep eating well and drinking water. Since you are already very active the medication mainly helps with hunger. I take a day off shots on Saturday to recover and eat more before my next dose. I also cycle reta for two or three months then pause. My current schedule uses reta on Sunday, NAD+ and another compound weekday mornings, and a different peptide at night for repair. I tried one energy compound but had a histamine reaction.

QuietSignal61archiveJun 5
↳ replying to @WarmMarble58

I would rather avoid a bad reaction too. If you want something to help training, bromantane is worth looking at. A friend who mountain bikes uses it and likes it. It has more human research behind it than some other options.

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Jogging on Shot Day · ZyraTrack Community