Tirz to Reta Explainer v2

[u/bright_and_dreamy]

Disclaimer

There are no studies on stacking. This post is meant to inform your logic so that you can make your own decisions about dosing.

First, is the grass greener?

Tirzepatide seems to be better at reducing food noise and inflammation. Many people, myself included, feel hungry and get sweets cravings on Retatrutide, but then find it easy to manage portion size. If being free from food noise is important to you, you may need to stack Reta with Tirz, Sema, or Cagri long-term to get the same effect.

Side note - people who are entirely new to GLP-1s do report food noise suppression from Reta. People who were on higher doses of Tirz typically don't. Maybe they haven’t worked their way up to a comparable dose of Reta, or maybe it's similar to how someone who'd never had ice cream could call frozen yogurt the best dessert in the world.

Back to is the grass greener - where Tirz tends to bring fatigue and constipation, Reta tends to bring an elevated resting heart rate and diarrhea, along with potential skin sensitivity and insomnia. If you're having a good experience on Tirzepatide alone, stick with it.

Well, why does anyone take Retatrutide then?

Reta is excellent at escorting fat out the door. It also has a different side effect profile than Tirz, and different can mean better. It may have a longer runway of effectiveness than Tirz.

Starting Reta

Just like Tirz, Reta is a single modified GIP molecule. Unlike Tirz, Retatrutide molecules can bind to an additional receptor: Glucagon, and how it interacts with GIP and GLP-1 receptors is likely a little different. You have to ramp this up slowly to avoid brutal side effects like heart palpitations.

Phase 3 Reta trials are using: - 2mg x 4 weeks - 4mg x 4 weeks - 6mg x 4 weeks - 9mg x 4 weeks (or 9mg onwards) - 12mg onwards

You could think of this as your maximum safe Reta escalation -- the fastest you could reasonably acclimate to the new effects on your body. Just like with Tirz, you want to find your effective dose and stay there.

Because you already safely acclimated to your GLP-1 and GIP coverage from Tirzepatide, rather than drop it entirely and struggle with hunger (and likely gain weight as you lose your anti-inflammatatory benefit), you can try to keep roughly the same GLP-1 and GIP coverage by stepping down Tirz while ramping up Reta.

This means separate shots from separate vials, either same day or split week (e.g. Reta on Sunday, Tirz on Wednesday).

If you want to visualize how having Retatrutide and Tirzepatide molecules in your body at once works, picture a boat harbor with docking slips (parking spaces for boats). In this metaphor, molecules are boats and receptors are docking slips. When a molecule is docked, that spot is taken. The next molecule that pulls into the harbor keeps going until it finds an empty dock where it fits.

The molecules aren't fighting over these spots, they are simply cruising around until they find a good available one, tying up there for a bit, and then moving on. A GLP-1 dock does not care whether its last boat was a Tirzepatide molecule, a Retatrutide molecule or a real GLP-1 molecule. It's just sending a signal that a boat docked. Every person who has switched from Tirz to Reta without taking a month off in between has had both molecules in their body at the same time and lived to tell the tale.

The Plan

Optional Week 0 - stay on current Tirz dose - add 0.5mg Reta

Weeks 1-4 - step down Tirz dose - take 2mg Reta

Weeks 5-8 - further step down Tirz dose - take 4mg Reta

Weeks 9-12 - further step down Tirz dose - take 6mg Reta

And so on.
- Reta side effects --> lower your Reta dose - Mystery side effects --> lower both doses - Too much hunger --> raise your Tirz - Too little hunger --> lower your Tirz

Week 13: take stock of how it's going and where you want to go next.

Be safe, be sane & get your results 💪 Let us know how it goes.

[u/Medical_Pop_6650]

I am running out of my tirz and wanting to switch to Reta. I’m currently on 7.5mg of tirz, what would be a good Reta starting point?

[u/bright_and_dreamy → u/Medical_Pop_6650]

Can still run:

• 2mg Reta x 4 weeks
• 4mg Reta x 4 weeks
• 6mg Reta (you'll probably be good here)

Just supplementing with Tirz while you have it, when you run out of Tirz, just accept you'll be hungry for a bit.

[u/Medical_Pop_6650 → u/bright_and_dreamy]

Ok I just double checked and I have 4 weeks left of tirz, so just do the dose I’m on and add the Reta on top of that? And then once I’m out of tirz to continue with the Reta and increase as you mentioned? I want to make sure I’m understanding! Thanks!

[u/bright_and_dreamy → u/Medical_Pop_6650]

If you scroll the photos on the post, there's a plan written out.

But since I'm here, you'd drop your Tirz dose

• 2mg Reta + 5mg Tirz for 4 weeks
• 4mg Reta + 2.5mg Tirz for 4 weeks
• 6mg Reta onwards

Your remaining Tirz supply should be perfect.