ForumDosing & Titration

Considering Low-Dose Retatrutide Addition to Tirzepatide Post-Bariatric Surgery

6 replies3 peopleMar 15, 2026☆ Follow
Summary

Is adding a very low dose of retatrutide to current tirzepatide safe after bariatric surgery with past stomach pain and slow metabolism?

The thread shows that tolerance to GI effects from these drugs often builds over months, so past sensitivity may not repeat now. Splitting doses to avoid peaks can reduce side effects and allow higher total amounts. Retatrutide at low doses is described as potentially gentler than tirzepatide, though starting slow is advised. Users share personal experiences with combined use and frequent small injections rather than weekly boluses.

What this discussion establishesStill open

Whether retatrutide at 0.5 mg is meaningfully less intense than a comparable tirzepatide increase for this user's specific cardia pain

Nothing here is advice.

6 replies · 3 people
KeenSignal54archiveopening postMar 15

I'm considering trying retatrutide and would like input to avoid any unwise moves. I'm currently using 2.25 mg tirzepatide but couldn't raise it much because of stomach pain near the cardia after my bariatric procedure. My system has adjusted since then and major side effects have faded. Instead of pushing the tirzepatide amount higher I'm thinking of starting retatrutide at a low 0.5 mg level for very gradual adjustment. My metabolism has stayed very sluggish since the surgery. Questions: does this sound risky overall? Could even 0.5 mg be too strong given my earlier stomach sensitivity with tirzepatide? Would injecting it roughly three days after the tirzepatide dose be reasonable? My food choices are mostly balanced though I miss protein targets sometimes and activity is just light daily movement.

CopperSignal27archiveMar 16

Stomach effects from these medications including slower gastric emptying are known to improve with time. Problems raising the dose earlier do not always repeat months later. Nausea and similar issues also commonly ease over several months though not in every case. I don't know much about bariatric procedures. In general higher tirzepatide amounts or adding retatrutide might be handled better now than at the start so beginning very low and advancing very slowly is sensible. Most stomach side effects hit hardest at peak blood levels one to two days after an injection. Splitting doses or using smaller amounts more often can therefore support a larger weekly total while keeping discomfort lower. I'm not sure there is a clear benefit to adding low-dose retatrutide over simply raising the tirzepatide amount assuming the last attempt was some time ago. I'm currently using both at 15 mg tirzepatide plus 5 mg retatrutide without major problems though I had earlier issues.

KeenSignal54archiveMar 17
↳ replying to @CopperSignal27

Thanks that information is useful. The idea that tolerance builds over time fits what I'm seeing. You're correct that quite a while has passed since I last tried raising tirzepatide so my response could be different now. My main worry is that the earlier pain near the cardia after surgery was quite bad so I've stayed cautious about increasing tirzepatide again. The thought of adding a tiny retatrutide amount came from wanting a very gradual step instead of a bigger change with tirzepatide. From running both together do you find retatrutide causes more or less stomach trouble than tirzepatide at low doses or about the same? I also didn't fully follow the part about second daily doses of 0.2 mg did that mean breaking the total into several small shots across the week?

CopperSignal27archiveMar 17

Yes when I used the prescribed Ozempic version any attempt to go above 0.5 mg per week caused worse nausea and feeling unwell even at 0.6 mg per week. At that point I didn't know others had already figured this out or about tools like glp-plotter so I sketched drug levels on paper myself. Since most stomach side effects occur at peak levels one to two days after dosing I switched to very small 0.22 mg shots every two days which totals around 0.77 mg weekly and produced less nausea than a single 0.5 mg weekly dose. I had already lost half my body weight and felt constantly hungry so even modest extra appetite control was worth some nausea. I continued the every-other-day pattern with retatrutide and tirzepatide mainly because I had grown used to it during the year on Ozempic. So if the cardia pain only appeared in the first day or two after an injection

KeenSignal54archiveMar 17
↳ replying to @CopperSignal27

Thanks for laying that out so clearly it helped a lot. The part about avoiding peaks by splitting doses makes sense. In my situation the cardia pain isn't mainly right after the shot it shows up whenever I eat no matter what food I try I've tested several options. I hadn't thought much about structured smaller frequent dosing so I'll look at GLP-plotter and calculate some options before making changes. The note that retatrutide might work better at lower amounts is also worth keeping in mind since higher doses don't suit me well. The whole explanation was interesting and gave me new things to consider.

AmberHarbour81archiveMar 18

The studies indicated most participants overcame side effects by the midpoint. Everything I've come across suggests retatrutide tends to be milder than tirzepatide though it can take longer to notice effects because of the low starting doses used.

KeenSignal54archiveMar 23
↳ replying to @AmberHarbour81

That's reassuring. I've seen similar comments that retatrutide tends to be easier on side effects than tirzepatide even if the effects build more slowly. I'm fine going gradually if it reduces problems.

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