Semaglutide
Available as a weekly injection or daily pill — both work on the same fullness signal
Brand names: Wegovy injection / Wegovy pill / Ozempic
Quick read · 5 min
People who tend to consider this:
- ✓Want a proven GLP-1 drug with strong cardiovascular evidence
- ✓Want the choice between injection and a more affordable pill (~$149/month)
- ✓BMI 30+ or 27+ with health conditions
- ✓Prefer one of the most established weight loss medications
This may not be right if:
- ✕You have a personal or family history of medullary thyroid cancer
- ✕You have a history of pancreatitis
- ✕You are pregnant or planning to become pregnant
- ✕You want the highest weight loss available
Not a complete list. Whether this treatment is right for you depends on factors only your doctor can assess.
Weight loss — what trials show
In the main injection trial (68 weeks), people lost an average of about 14.9% of their body weight — roughly 33 lbs for a 220 lb person. The pill form was studied in a separate 64-week trial, where people lost an average of 13.6% — and 16.6% among those who took every dose. A large separate study also found that semaglutide reduced the risk of major heart events by 20%.
These are averages from clinical trials — individual results vary. Trials compare the drug against a dummy pill, not against other weight loss drugs.
See the full trial data →How this compares
Average weight loss in clinical trials. Not a ranking — individual results vary.
Averages from clinical trials at highest approved dose. Not everyone achieves these results.
What to expect — week by week
Many people notice reduced hunger or feeling full sooner. This varies between people.
Most people start to see measurable weight loss during this period.
Side effects often settle around this point. Measurable weight changes are becoming more visible.
This is when most of the weight loss typically happens. Side effects usually settle.
Rate of loss slows as your body approaches equilibrium.
What happens if you stop?
In STEP 4, stopping semaglutide after a 20-week run-in led to significant weight regain. In STEP 1, one-year follow-up after stopping showed participants regained approximately two-thirds of the weight they had lost.
Weight trajectory — during treatment and after stopping
Based on: STEP-1 withdrawal study — Wilding et al. Diabetes Obes Metab 2022
Most of the lost weight returns within a year of stopping — this is the body returning to its defended weight, not a failure. Long-term use or maintenance therapy can help preserve results.
Side effects
Frequencies from STEP 1. Most stomach and gut side effects are mild-to-moderate and peak during the dose increase period (first 12–16 weeks).
Percentages from STEP 1. Source: trial publication.
- •In animal studies, semaglutide caused thyroid tumours. It is unknown whether this applies to humans, but it is not prescribed to people with a personal or family history of medullary thyroid cancer.
- •Stop taking and contact your doctor immediately if you have persistent severe abdominal pain — this may be a sign of pancreatitis.
- •This drug may increase the risk of gallbladder problems, including gallstones. Tell your doctor if you develop sudden upper abdominal pain.
This is not a complete list. Your doctor can advise based on your full medical history.
Muscle and lean mass
DXA substudy data from STEP 1 showed semaglutide led to proportionally greater reduction in fat mass than lean mass — consistent with findings from other GLP-1 drugs. Lean mass loss was proportional to the amount of weight lost overall.
What does the lost weight consist of?
Resistance training (weight lifting, bodyweight exercises) can significantly reduce the lean mass portion. Aim for 2–3 sessions per week during weight loss.
Source: STEP-1 body composition analysis (DEXA scan)
Cost & access
Pill: ~$149/month self-pay (~$25 with insurance). Injection: ~$1,350/month list price. Novo Nordisk NovoCare programme available.
Requires a prescription from a licensed healthcare provider. Prices vary. Ask your doctor about savings programs.
~$149–$1350/moper month (list price)
Pill form (Wegovy 25mg): ~$149/month self-pay. Injection form (Wegovy 2.4mg): ~$1,350/month list. NovoCare assistance available.
How to take it
Semaglutide is the same drug whether injected or swallowed. The main differences are cost, convenience, and how you take it.
- ✓ Daily pill — no injection
- ✓ No refrigeration needed
- ✓ Up to 16.6% (full adherence, OASIS 4) weight loss
- ⚠ 30-min fasting window before eating
- ⚠ ≤4oz water with pill only
- ✓ Once-weekly injection
- ✓ No food timing restrictions
- ✓ Up to 15.2% weight loss
- ⚠ Needs refrigeration (36–46°F)
- ⚠ Self-injection required
How it works
A GLP-1 analogue with an extended half-life of approximately one week. Reduces appetite by activating GLP-1 receptors in the brain's appetite centres, slows gastric emptying, and improves insulin secretion from the pancreas.
Cardiovascular & other benefits
The SELECT trial (n=17,604) demonstrated a 20% reduction in major adverse cardiovascular events (MACE — heart attack, stroke, or cardiovascular death) vs. placebo in adults with established cardiovascular disease and obesity, without diabetes. Also showed fewer heart failure events in STEP-HFpEF.
- ✓20% reduction in heart attacks and strokes (SELECT trial, established CVD)
- ✓Improved blood pressure and cholesterol across STEP trials
- ✓Reduced heart failure hospitalisations (STEP-HFpEF trial)
- ✓Improved HbA1c in people with type 2 diabetes
Community insights
These are personal experiences shared in public online communities — not medical advice.
“The 'Ozempic face' concern is mostly about rapid weight loss, not the drug itself. Maintaining high protein intake and resistance training helps preserve muscle and facial volume.”
“Nausea is usually worst in the first 16 weeks during dose escalation. Injecting at night before bed means many people sleep through the worst of it.”
“Many people report the drug 'stops working' — usually this is a plateau, not resistance. Reviewing food intake and increasing activity often helps.”
Common questions
After reading this page, most people compare this with other medications, check if they qualify, or learn about side effects in more detail.
Next step most people take
Based on clinical trials · No rankings · Every claim linked to source
Last reviewed: March 2026