CommunityStacking & Switching

Accidentally injected Tirz instead of Reta

12 replies13 peopleJul 7, 2026☆ Follow
Summary

What should I expect after accidentally injecting 1 mg tirzepatide instead of retatrutide?

The thread concludes that a single 1 mg dose of tirz in place of reta is unlikely to cause noticeable problems because it is a low starter-level amount of a similar medication. Most participants advise simply resuming the normal reta schedule at the next planned time without adjustment. Several users share their own similar mix-ups and describe no ill effects, while recommending better labeling and storage to avoid repeats.

What this discussion establishes

Nothing here is advice.

12 replies · 13 people
SharpAnchor78archiveopening postJul 7

Hey everyone, I was exhausted and made a dumb error. I shot 1 mg of tirz by mistake instead of my 1 mg reta. What should I expect? Will side effects be lighter or heavier? How do I get back on my regular reta plan?

GreyAlder96archiveJul 7

Wouldn't think twice about it. 1 mg is only half a starting dose and the two meds are pretty close. Just wait for your next scheduled time and take the reta as usual. It's basically like taking naproxen when you meant ibuprofen.

RustKettle57archiveJul 7

You'll be totally fine. Such a small amount shouldn't matter. I just started using several peptides at once and, worried about exactly this mix-up, I finally labeled everything today.

SlowLedger31archiveJul 7
↳ replying to @SharpAnchor78 (opening post)

Enjoy a mild appetite drop for a week. If it had been cagri I might be a little concerned, but you'll be okay. Just rub some dirt on it.

PatientBeacon15archiveJul 7

You picked the safer direction to mess up. The opposite switch would be more of an issue.

CopperAlder51archiveJul 7

This isn't even worth posting on Reddit. People there have taken 30 mg of reta in one go.

BlueBramble49archiveJul 7

No issue at all. Just leave a short gap before pinning the correct peptide next time; three days should work.

PlainAlder11archiveJul 7

Quick, call one of these.

LevelThistle44archiveJul 7

If you're still around, the main thing is to figure out exactly how the mix-up happened and change your setup so it doesn't happen again.

LevelAlder29archiveJul 7

Just adding that you'll be okay like everyone else said. It's a tiny dose. I also live with people who ignore labels. Someone suggested a locking storage container; maybe something like that would help.

AmberCompass48archiveJul 8

1 mg is basically a baby dose, meant for little kids. No worries at all.

KeenAlder60archiveJul 8
↳ replying to @CopperAlder51

We had someone here who wanted peptides to cancel out all the side effects and then disappeared.

GreenMeadow27archiveJul 8

To avoid this next time, check out the current thread on organization and labeling. How do you keep your peptides sorted? I've seen several posts about label systems and they seem pretty common. For anyone using labels or printers, have you run into problems with them?

Add your experience

If you have tried it, this topic is still open. Sign in to reply — it takes a minute.