What Are GLP-1 Drugs and How Do They Work?
GLP-1 stands for glucagon-like peptide-1, a naturally occurring hormone involved in regulating appetite and blood sugar. Medicines in this class mimic or enhance that hormone's effects, with commonly reported results including a reduced sense of hunger, increased feelings of fullness, and slower gastric emptying — an effect that often settles over time as the body adjusts.
The main GLP-1 medicines used for weight management
Two GLP-1 medicines are widely prescribed for chronic weight management in adults:
- Wegovy (semaglutide) — a GLP-1 receptor agonist given as a once-weekly injection, starting at a low dose and adjusted by a prescriber over time.
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, also injected once weekly, with dose adjustment guided by the prescriber. You can read more about Mounjaro as a GLP-1 medicine and explore the full Mounjaro information hub for a broader overview.
Dual-acting medicines: a newer direction
Tirzepatide targets both the GIP and GLP-1 receptors, making it a dual-receptor agonist rather than a single GLP-1 agent. Research into medicines that act on multiple appetite-related pathways is an active area — often described as the future of GLP-1 drugs — though any new medicine would require regulatory approval and a prescription before it could be used. For a deeper look at the underlying biology, see our pages on what GLP-1 is and how GLP-1 receptor agonists work.
Important things to know about this drug class
- All GLP-1 medicines for weight management are prescription-only — suitability and dosing are decided by a prescriber, not the patient.
- They are not insulin, not a cosmetic quick fix, and not appropriate for everyone.
- Commonly reported side effects include nausea, constipation, diarrhoea, and fatigue, particularly early in treatment or after a dose increase.
- If you experience severe or persistent symptoms, contact your healthcare professional promptly.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your GLP-1 Journey with GLP Trackr
Whatever GLP-1 drug you have been prescribed, staying consistent week to week is one of the biggest factors in getting the most from your treatment — and that is exactly what GLP Trackr is built for.
The app's side-effect tracker lets you log how you feel after each dose, so that patterns become visible over time. Noticing that nausea tends to peak on day two, or that energy dips in a particular week, turns vague feelings into concrete information you can bring to your next prescriber appointment. The built-in doctor report feature helps you do exactly that — presenting a clear summary of your logged journey rather than relying on memory.
Alongside symptom logging, the dose and injection-site logger keeps a complete record of every weekly shot: the date, the dose strength, and the site used. That record matters more than it might seem — it removes guesswork, supports rotation, and means a missed or delayed dose is logged rather than lost.
GLP Trackr also helps with daily check-ins covering weight, mood, food noise, energy, and sleep — capturing the fuller picture of how a GLP-1 medicine is fitting into your life, not just the number on the scale.
GLP Trackr is a tracking and journaling app, not a medical service. It does not provide dosing guidance or medical advice — any decisions about your treatment belong with your prescriber or doctor.
Ready to track your GLP-1 journey in one place? GLP Trackr is free to try for 7 days — available on the App Store and Google Play.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
Exercise & Steps
Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
Never Forget a Dose Again.
Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
Watch Your Body Transform, Week by Week.
Log your weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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The Most Advanced GLP-1 Brain Ever Built.
The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
GLP-1 drugs are prescription-only medicines that mimic a natural appetite-regulating hormone called glucagon-like peptide-1. Used for weight management in adults, they include semaglutide (Wegovy) and tirzepatide (Mounjaro). They are taken as once-weekly injections and require a prescriber's supervision.
Both Mounjaro and Wegovy act on the GLP-1 pathway to reduce appetite and increase feelings of fullness. Mounjaro also targets the GIP receptor, making it a dual-acting medicine. Like all GLP-1 drugs for weight management, both are prescription-only and dose-adjusted by a prescriber.
Nausea, constipation, diarrhoea, fatigue, and indigestion are among the most commonly reported side effects, particularly early in treatment or after a dose increase. They often ease over time. If side effects are severe or persistent, contact your healthcare professional promptly.
Research is ongoing into medicines that act on multiple appetite-related pathways simultaneously, building on the dual-receptor approach seen with tirzepatide. Any new medicines in this class would need regulatory approval and a valid prescription before use. Your prescriber is the best source of up-to-date guidance.
GLP Trackr lets you log doses, injection sites, side effects, weight, and daily wellbeing in one app. It helps you spot patterns and build a record to discuss with your prescriber. It is a tracking companion, not a medical service — all treatment decisions remain with your healthcare professional.