ForumDosing & Titration

Retatrutide Dosing Advice

7 replies3 peopleApr 13, 2026☆ Follow
Summary

How to dose retatrutide after reconstituting a 10 mg vial and whether it helps retain muscle better than tirzepatide during fat loss

The thread shows that reconstituting 10 mg with 2 ml yields a 2.5 mg dose in 0.5 ml, matching the typical research starting amount. Participants stress holding each dose for four weeks before increasing to limit side effects such as raised heart rate, and note that retatrutide mainly brings early fullness rather than immediate drops in food noise. Both compounds appear to affect muscle similarly, so protein intake plus consistent lifting is presented as the real factor for preservation. The user switched hoping for better muscle retention at 340 lb while training regularly.

What this discussion establishesWhere people disagree

Whether retatrutide truly spares more muscle than tirzepatide

Still open

Whether the user was still losing weight on tirzepatide before switching

Nothing here is advice.

7 replies · 3 people
BlueMeadow96archiveopening postApr 13

I mixed up my 10 mg vial using 2 ml and then injected 0.5 ml, though I'm second-guessing if 1 ml would have been better. Could someone give me some guidance here?

KeenAlder60archiveApr 13
↳ replying to @BlueMeadow96 (opening post)

Oh man. Studies usually begin retatrutide at 2.5 mg, which matches what you did. It doesn't produce noticeable sensations for most. Stick with that amount for a full month prior to any increase. Many don't notice reduced food thoughts until higher amounts, but you might feel full sooner after eating less. It takes about a month to build up fully. Rushing the dose can lead to more side effects like elevated heart rate. What's your aim with it - shedding fat or total weight drop?

PlainCompass54archiveApr 13

It depends on the milligrams you want. Reconstituting 10 mg with 2 ml means 0.5 ml gives 2.5 mg while 1 ml gives 5 mg.

BlueMeadow96archiveApr 13
↳ replying to @KeenAlder60

Hi, my goal is to reduce body fat. I've used tirzepatide before and felt ready to move on. Right now I'm at 340 pounds and hit the gym five or six times weekly.

KeenAlder60archiveApr 13
↳ replying to @BlueMeadow96

Were you continuing to lose on tirzepatide? What made you change to retatrutide? It's not necessarily the following step unless the previous one stopped working.

BlueMeadow96archiveApr 13
↳ replying to @KeenAlder60

Tirzepatide started causing more muscle loss than I wanted, so I hoped retatrutide might help keep some muscle.

KeenAlder60archiveApr 13
↳ replying to @BlueMeadow96

Both actually have similar impacts on muscle. The idea that retatrutide leads to less loss isn't accurate. To keep muscle, hit your protein targets while training, and that should help maintain it.

PlainCompass54archiveApr 13
↳ replying to @KeenAlder60

Losing some muscle along with fat is typical and okay, even without these meds. With all the extra weight gone, you're not building as much from daily activity anymore.

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Retatrutide Dosing Advice · ZyraTrack Community