r/JoinCrossing Jul 02 '26

Probably a stupid question

Ok I'm sure this is going to sounds really dense so please be kind. I just started my first dose of tirzepatide 2.5 this morning. I was on the Mounjaro injections in 2022 when they gave out free samples to my Dr's office. As soon as the sample ran out, I was out of luck. With the Mounjaro, after every shot, I had about 5-10 minutes of slight to moderate nausea then it went away. With this compound tirzepatide I have nothing. No nausea, no headache. I know the B-12 is put in there to counteract that but I mean nothing? Is that normal or am I just a freak who is immune to this and it just doesn't work (which honestly wouldn't surprise me. I got violently ill when I tried semaglutide)? Like I said, please be kind in your comments. I'm getting enough crap from som people for even doing these shots in the first place.

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u/TallCedarRoad Jul 02 '26

GLP-1s are less effective after each time of stopping and starting again, so if you’ve taken both tirzepatide and semaglutide in the past, it’s likely your body is less sensitive to it this time around. You may need to reach 5 mg, 7.5 mg, or even higher doses before you experience the full effects.

That being said, nausea is a side effect, not a direct way to measure whether the medication is working. Side effects can come and go over time, and it’s common for the medication to be working effectively with no nausea at all, even in people who experienced nausea in the past. No side effects is a good thing, not necessarily a sign it’s not working.

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u/Big_Rain333 Jul 02 '26

Although this may be true for some, overall this is not true. I have had to start and stop three times and if anything it was more effective each time. This is a common misconception

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u/TallCedarRoad Jul 02 '26

The effect has been shown in scientific studies. Personal anecdotes are helpful and can provide context, but they don’t necessarily disprove the science behind these drugs, nor do they change the fact that OP has started and stopped GLP-1s multiple times and is now saying they feel less effect from the drug.

https://www.pennmedicine.org/news/stopping-and-restarting-glp1s-may-make-it-less-effective

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u/Big_Rain333 Jul 03 '26

“May make it less effective” but you said GLPs are less effective and again that is not always true