An independent intelligence board aggregating credible research, preprints, clinical findings, biohacking experiments, and community discussions on therapeutic peptides, longevity science, and evidence-based anti-aging. Stories are scored for relevance, credibility, novelty, momentum, and practicality so the most important findings surface first.
A person wrote they’ve been taking semaglutide (a drug used for weight loss) for over a year, dropped a lot of weight, and are close to their goal. They’re about to start a low dose of Vyvanse (a stimulant used for ADHD) and are worried because stimulants commonly reduce appetite and can cause more weight loss. They’re asking what might happen and whether combining the two medicines is safe or likely to cause problems. Semaglutide is the active ingredient in drugs like Ozempic and Wegovy. It acts like a natural gut hormone that tells your brain you’re full and slows how fast food leaves your stomach. That combination reduces appetite and calorie intake, which is why people lose weight on it. Vyvanse (lisdexamfetamine) is a stimulant prescribed for ADHD; it raises levels of certain brain chemicals that increase focus and often lower appetite as a side effect. What we actually know from this note is personal experience, not a clinical trial. People commonly report that stimulants like Vyvanse make them eat less, especially when they first start or the dose goes up. There aren’t big randomized studies that specifically test semaglutide plus stimulants for ADHD, so we don’t have firm numbers on how much extra weight someone will lose when they take both. In short: it’s plausible you’ll see more appetite suppression and possibly additional weight loss, but exactly how much and how fast is uncertain and varies a lot between people. Why this matters is practical. If you’re already near your target weight, extra appetite loss could push you below a healthy weight, lower your energy, or make it harder to get enough nutrients. For someone trying to keep their weight stable, it’s worth planning ahead: regular weigh-ins, monitoring energy and mood, and having strategies to ensure you eat enough (like scheduled meals, calorically dense snacks, or working with a dietitian). If your main concern is the ADHD treatment working well, remember that treating ADHD can improve daily functioning, which may outweigh worries about small additional weight changes. There are some caveats and risks to keep in mind. Both drugs can cause side effects: semaglutide often causes nausea, stomach upset, and sometimes low blood sugar in people on diabetes meds; stimulants can increase heart rate, raise blood pressure, cause sleep trouble, or anxiety. Combining them isn’t universally banned, but doctors should monitor you—especially for too-rapid weight loss, nutritional deficiencies, mood changes, high heart rate, or blood pressure spikes. Don’t stop or start either medication without talking to your prescriber. If you have a history of heart problems, eating disorders, or severe anxiety, bring that up before starting Vyvanse. Bottom line: It’s common to see extra appetite reduction when adding Vyvanse to semaglutide, so plan monitoring and talk to your clinician about dose, nutrition, and safety checks.
Source: r/Semaglutide