CommunityDosing & Titration

Add Reta or Cagri to Trz?

16 replies13 peopleApr 13, 2026☆ Follow
Summary

Should I add Cagrilintide or Retatrutide to Tirzepatide to overcome a weight loss stall or regain after reaching goal?

Users who regained or stalled on maxed Tirzepatide report trying low-dose additions of either peptide after pausing or lowering Tirz. Experiences vary: some found Cagri effective for strong appetite control via amylin pathways but with notable GI side effects if started too high, while others broke stalls with very gradual Reta titration alongside Tirz for added energy or suppression. Most stress starting far below common doses and titrating slowly over weeks. Several prefer Cagri over Reta when the goal is purely appetite reduction without switching entirely.

What this discussion establishesWhere people disagree

Whether adding Reta to Tirz is worthwhile versus switching or adding Cagri instead; some see value in the glucagon effect while others view it as redundant.

Still open

Optimal long-term maintenance strategy once the final 10-15 lbs are lost and whether continued multi-peptide use is necessary.

Nothing here is advice.

16 replies · 13 people
PlainTimber88archiveopening postApr 13

Hi everyone. Looking for more real experiences on this than I've seen elsewhere. Hit my goal at 110 lbs but then put 10 back on even though nothing changed. Been battling those last 10 pounds for about six months now. Tirz was already at the 15 mg max and food noise stayed pretty quiet. Took three weeks off, restarted at 10 mg, then added 3 mg Reta the next week. That was a mistake and left me really nauseated so I haven't touched Reta again. Now I'm thinking about trying Cagri instead to finally drop those 10 pounds. Or should I just raise Tirz again? Would splitting the new peptide into two smaller shots help? Any thoughts welcome.

ClearFenwick64archiveApr 13

Same boat here. Not gaining but not dropping either for four or five months straight. Even tried 17.5 and 20 mg with no movement. Food drive feels like it did before Tirz started. I already have both Cagri and Reta on hand but can't decide which one to try, so any input would help. Still need to lose 12 lbs.

CopperTimber28archiveApr 13

Similar spot for me. Started Tirz last July and now pin 6 mg every five days. Not exactly stalled but those last five pounds refuse to budge. I could live with where I am, yet a goal is a goal and I've come too far to quit. Raising Tirz is an option but I'd rather keep the dose low for maintenance so my supply lasts. Ordered two vials of Reta and plan to try a tiny starting dose three days after my Tirz shot to check tolerance and results. Considered Sema but hoping Reta's blood-pressure benefit shows up. Can't begin until the vials arrive later this week.

NorthCinder83archiveApr 13
↳ replying to @PlainTimber88 (opening post)

You probably began Reta at too high a dose. I prefer Cagri because it hits amylin receptors that neither Tirz nor Reta touch. I inject on a six-day schedule offset by three days. Started Tirz about twenty months ago. After passing 10 mg I added low-dose Cagri and slowly raised Tirz to 20 mg weekly. Cagri upset my stomach but wiped out food cravings completely. Later added 0.5 mg Reta and titrated up while lowering Tirz to 10 mg weekly. Six months after that I stopped Cagri. Ran all three together for half a year before dropping Tirz another six months later. Down 92 pounds total and now alternate Cagri and Reta for the remaining 10-15 lbs. Splitting each peptide into half doses every three or four days didn't change loss speed. Never stopped any abruptly; always tapered over four to six weeks. Whenever a stall lasted two or three weeks I changed one variable. Sema looks weak next to the others.

IronPebble47archiveApr 13

No hands-on experience stacking GLP-1s myself, but it seems smartest to skip it. Tirz already covers GLP-1 and GIP, so the only new piece from Reta would be glucagon activity and I'm not convinced that's worth adding. Cagri works through a completely separate amylin pathway with zero overlap, so layering that onto Tirz makes more sense right now. Only consider switching fully to Reta if Cagri on top of Tirz doesn't move the needle.

PlainTimber88archiveApr 17

Thanks everyone, this thread gave me exactly what I needed. Any pointers on where to look for Cagri dosing schedules?

NorthCinder83archiveApr 18
↳ replying to @PlainTimber88

Search The Lancet study. It started people at 0.3 mg then stepped to 0.6, 1.2, and 2.4 mg every four weeks. I began at 0.16 mg (half the lowest published dose) to keep stomach issues down and raised by only 0.1 mg every few weeks. Now at 1.1 mg every six days and appetite stays well controlled so I'm holding there.

SteadyMeadow70archiveApr 28

Late to the thread and my Tirz dose is lower than most, but adding Reta finally ended a stall when I went much slower than you did. Tirz on Friday mornings, Reta Monday nights. Began at 0.5 mg weekly, moved to 0.75 mg after two weeks, then 1 mg after another two weeks. That last step finally got things moving again.

PlainMarble29archiveMay 7
↳ replying to @CopperTimber28

Did you end up trying what I'd call microdosing Reta with your Tirz? Curious how that worked out.

PlainTimber88archiveMay 11
↳ replying to @PlainMarble29

Back to Tirz only for now. Reta caused strong nausea so I quit after one week, though I realize I started too high. Planning to add Cagri instead but haven't begun yet.

PatientHarbour23archiveMay 11
↳ replying to @PlainTimber88

Go extremely low with Cagri. If Reta felt rough this one can feel ten times worse. Started at 0.5 mg and wished I hadn't.

SharpAnchor92archiveMay 12
↳ replying to @NorthCinder83

The chart is counterintuitive because a lower number actually means stronger binding. That's why Reta doesn't suppress appetite as well (higher GLP-1 number) and why some people add a tiny bit of Sema to a Tirz regimen when food noise returns.

PlainMarble29archiveMay 14
↳ replying to @PlainTimber88

Not the original poster but keep me posted anyway. I've been thinking about adding Cagri too but haven't pulled the trigger. Come back and share how it goes once you start.

WarmMeadow92archiveMay 16
↳ replying to @PlainMarble29

Not the OP but in almost the same situation. On Tirz for about 17 months, up to 18 mg, still 20 pounds to go. Two weeks ago I tried 4 mg Reta and lowered Tirz at the same time. Too much Reta apparently: bad constipation, lower abdominal pain, gas, and felt lousy the whole time. Appetite control wasn't even that strong. Probably should have kept Tirz steady and added only 2 mg Reta. Tried Cagri before and liked it, so starting again today at 0.5 mg while keeping the usual 18 mg Tirz. Not giving up on Reta but will begin much lower next time.

PatientSignal60archiveMay 16
↳ replying to @SteadyMeadow70

Are you planning to keep Reta going or drop it and stay on Tirz only?

CopperSignal27archiveMay 16

I reached 15 mg Tirz after a year of nausea on Ozempic and still felt hungry, but didn't want to stop Tirz since it was working. Added 5 mg Reta later and then 0.25 mg Cagri every four days. Dosed smaller amounts every two days mainly to limit nausea the way I had to with Ozempic. That combo got me the last 13 kg down to 65 kg from an original 145 kg. Maintaining such a big loss seems to require the higher doses and stacking. Twice-weekly dosing made adjustments faster but weekly would work if done slowly. Noticed mild nausea from the 0.25 mg Cagri and spent a couple months figuring out if I could tolerate it.

PlainTimber26archiveMay 16

Posting this for anyone who searches later, including future me. Low and slow seems safest. Cagrilintide schedule: week 1 at 0.25 mg, week 2 at 0.5 mg, week 3 at 1.0 mg, week 4 at 1.7 mg, then 2.4 mg maintenance from week 5 onward. Full ramp takes 16 weeks with once-weekly shots.

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