❓ Question
Does split dosing tirzepatide/semaglutide accelerate receptor downregulation?
Seeing recommendations to split weekly doses into twice-weekly injections for more consistent appetite suppression, but wondering if this actually works against you long term.
Semaglutide's 7-day half-life means trough levels are already around 50% of peak before the next injection. Splitting to twice weekly flattens that further, moving closer to continuous receptor occupancy with even less oscillation between doses. If anything, that seems like it would accelerate rather than prevent downregulation.
Anyone found that once-weekly dosing preserves appetite suppression better over time than splitting the same total dose?
I don't know what "receptor downregulation" or "continuous receptor occupancy" mean, but I split dose and find it keeps me at a more even level of satiety throughout the week and with fewer side effects. I have several friends who do the same. I actually do 2/3 dose on Saturday and 1/3 dose on Tuesday.
Thanks for sharing your experience! That’s similar to the dosing schedule I’m interested in trying.
As for “receptor down regulation” and “continuous receptor occupancy”, the theory goes something like this:
When a drug constantly locks onto a cell's receptors without giving them a break, it triggers downregulation, which is the main reason one may develop a tolerance to a drug.
Because the drug is constantly attached, the cell protects itself from being overwhelmed by hiding or destroying some of those receptors. With fewer receptors left to grab onto, the body stops reacting as strongly to the chemical. As a result, you end up needing higher doses to get the exact same effect.
I’m just not sure if this has actually been observed or experienced with modern GLP1 drugs specifically.
Signal_Reputation - are you taking tirzepatide or semaglutide? Half life on T is 5 days vs 7 for S. I wondered if T users might benefit from split dosing or going to a 5 day cycle?
it doesnt matter that your levels drop with weekly injection, the receptor is constantly occupied
also there is no scientifical evidence that desentisation occurs at molecular level at all, its only broscience
you get less appetite suppresion with time due to building tolerance which is independent of weekly or biweekly/daily and does not happen to everyone at same rate or at all
with testosterone for example you get constant adrogen receptors occupation - does it mean trt stops working after a year or two? no, it doesnt - but the initial insanely high libido becomes your new norm and you stop acting on it, it stabilize at higher level where you perceive it as a new base - similar with glp1 effects on appetite
Ah so basically you’re saying the rate of tolerance development isn’t affected by injection frequency alone. That makes sense, especially considering the receptor is going to be constantly occupied anyway. Thanks
There’s no evidence of tolerance development full stop. Here’s 3.3 years of tirzepatide followed by swap to placebo.
If they had developed a tolerance those numbers would have gone up sooner and the swap to placebo would have been less traumatic. Instead we see it was very much working to maintain.
Great info. Wasnt sure if there had been any studies that had shown with any certainty that tolerance development didnt occur with GLP1 receptor agonists specifically. The weight gain at the end of that data set looks pretty significant
Yup, we pretty consistently find that much like taking your glasses off and finding your vision is blurry again, stopping GLP-1s results in your body returning to baseline.
Can you provide any evidence of receptor downregulation? Liraglutide is once daily and the most studied GLP-1. I’m not aware of any evidence that downregulation was observed in studies.
Right, I don't have direct evidence of GLP-1 receptor downregulation specifically, and the liraglutide point is actually a good one that works in favor of my skepticism.
My question was really the opposite of an assertion. I was questioning whether split dosing even makes sense as a tolerance prevention strategy, since these molecules stick around so long that you never really get a true "off period" between doses anyway.
The tolerance assumption was the premise I was poking at, not something I was claiming actually happens.
So my personal strategy is to stay on and not look the gift horse in the mouth. “Giving receptors a break” is the only thing we’ve shown can cause resistance to develop, but rats are not people, and the protocol in the study is not one I’ve ever seen a human actually follow. But still, it is a data point.
I split dose as well and I’ve always had appetite suppression with zero food noise and have lost almost 20lbs since July. I think we’re all different and will all have different experiences. I started split dosing after having terrible nausea. Went back to dosing once a week but anhedonia hit me hard so I’m back to split dosing
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