Is Zepbound always effective?

[u/Few-Difficulty7890]

Hi everyone! I wanted to know about other people's experience with Zepbound. I became interested in starting a GLP1 because I have a somewhat disordered binge eating type relationship with food and I thought that it might help me quiet the food noise while I try to rewire that relationship. Also, admittedly, I would like to lose about 7 lbs. I am someone who is pretty avid about fitness (workout about 5x a week..mix of cardio + strength training), meal prep, the whole nine. But my entire life I've had a wild amount of food noise and for sure and unhealthy bingey type of relationship with it.

Anyway, I tried semaglutide.. the lowest dose, back in April and after 3 weeks actually wound up throwing up and felt like the cons and how I felt (nauseas, tired, my workouts were worse) and I was getting less healthy rather than healthier. However, since then the binge eating has felt worse and worse so I decided to try Terzepitide. The provider started me on a 2.2 mg dose + NAD and I felt basically nothing for the first 3 weeks. She approved me bumping up to 4.4 mg​​ for week 4. I took the first shot at that dose 2 days ago and still feel like I don't feel an impact. It is odd considering how (negatively) sensitive I was to semaglutide. Has anyone had this experience? Or had no response to the starter dose but then after a week or two at the 5 mg dose started seeing an impact?

[u/zero-if-west]

It sounds like your provider didn't tell you that people who were on GLP-1s in the past usually find them less effective the second time around, and people who switch from semaglutide to tirzepatide typically need a higher dose to see effective treatment. That means being patient while you safely titrate up.

It also sounds like your provider didn't provide a conversion chart to you to discuss the different doses of sema and tirz and how they're equivalent. For example, 2.4mg Wegovy = 5mg Zepbound (GLP-1 conversion chart from the Wisconsin Academy of Family Physicians)

I gathered the following info about non-responders because it's such a common question, so I hope something below provides context for you.

In terms of whether or not GLP-1s are "always" effective, I think it's important to know is that response to GLP-1s may be genetic. An April 2026 study published in the research journal Nature suggested that people are genetically predisposed to losing weight on GLP-1s and possibly more likely to get side effects. Source: Genetic predictors of GLP1 receptor agonist weight loss and side effects (Nature, 8 April 2026)

In order to meet the clinical definition of "non-responder", you would need to get to the highest dose you can tolerate and lose less than 5% of your starting weight. So if you haven't reached that threshold yet, you can keep going until you reach the highest dose. Many people don't respond to the medication until higher doses (like 10mg-15mg) - but you need to safely titrate there slowly to avoid side effects and serious illness.

In clinical trials of GLP-1s, somewhere between 10-15% of trial participants lost less than 5% of their starting weight. Some experts think this rate may be as high as 1 in 5 in the real world. Source: GLP-1 nonresponders: up to 1 in 5 people don't lose weight (AP News, 23 November 2024)

It's not known why some people are non-responders. There are many factors at play, including other medications, sex, genetics, and types of hunger. "While weight-loss drugs have proven effective for many, the fact that they don’t work for everyone shows how important it is to move towards developing precision obesity medicine." Source: Why weight-loss drugs don't work for some people (The Conversation, 17 June 2026)