Ozempic (Semaglutide) Guide
Mechanism, Dosage, Clinical Data & Tracking Protocol
Ozempic (semaglutide 0.5–2 mg) is a once-weekly GLP-1 receptor agonist FDA-approved for type 2 diabetes. Its SUSTAIN trial program demonstrated consistent HbA1c reduction and significant weight loss, making it one of the most-prescribed GLP-1 medications worldwide. Track every dose, side effect, and outcome in Shotlee.
What Is Ozempic?
Ozempic is the brand name for semaglutide — a glucagon-like peptide-1 (GLP-1) receptor agonist administered as a once-weekly subcutaneous injection. Developed by Novo Nordisk, it was FDA-approved in December 2017 for glycaemic control in adults with type 2 diabetes. The same molecule at higher doses is marketed as Wegovy for chronic weight management.
GLP-1 is an incretin hormone naturally released by intestinal cells after eating. Semaglutide mimics GLP-1 but has a half-life of approximately 7 days (vs. minutes for native GLP-1) due to its fatty acid chain and albumin binding, making once-weekly dosing effective. It reduces appetite via hypothalamic receptors, slows gastric emptying, and stimulates glucose-dependent insulin secretion.
Ozempic Dose Escalation Schedule
Starter dose — not therapeutic. Allows GI tolerance to develop before escalation.
First maintenance dose. Many patients achieve target HbA1c reduction at this level.
Escalate if 0.5 mg is not meeting glycaemic targets after at least 4 weeks.
Maximum approved dose. Approved in 2022; provides additional HbA1c and weight reduction.
How Semaglutide Works
SUSTAIN Trial Highlights
SUSTAIN Program: Key Endpoints
| Trial | Comparator | HbA1c Change | Weight Change | Duration |
|---|---|---|---|---|
| SUSTAIN-1 | Placebo | −1.5% (1 mg) | −6.1 kg | 30 weeksBest |
| SUSTAIN-2 | Sitagliptin | −1.5% (1 mg) | −4.3 kg | 56 weeks |
| SUSTAIN-3 | Exenatide ER | −1.5% (1 mg) | −5.6 kg | 56 weeks |
| SUSTAIN-6 | Placebo | −1.1% (1 mg) | −3.6 kg | 104 weeks |
| SUSTAIN-7 | Dulaglutide | −1.5% (1 mg) | −5.8 kg | 40 weeks |
How to Inject Ozempic
Common Side Effects & Management
Nausea
Most common (17–20%). Usually worst in the first 4–8 weeks. Eat smaller meals, avoid high-fat foods, stay hydrated. Subsides in most patients by week 12.
Vomiting
Occurs in ~5–9% of patients. If persistent, discuss with prescriber — a dose delay or reduction may help more than antiemetics.
Diarrhoea / Constipation
GI motility changes are common. Increased fibre and hydration help. Track stool frequency changes in Shotlee to share patterns with your provider.
Injection Site Reactions
Mild redness or itching at injection sites is normal. Rotate sites every week. Persistent lumps may indicate lipohypertrophy — avoid injecting the same spot.
Headache / Fatigue
Often occur in the first few days post-injection during dose escalation. Usually resolve within 24–48 hours. Log onset and duration in Shotlee.
Rare: Pancreatitis
Seek emergency care for severe abdominal pain radiating to the back. GLP-1s carry a label warning; absolute risk remains low in clinical populations.
Track Your Ozempic Protocol in Shotlee
Systematic tracking gives your prescriber the data to make better dose decisions.
Guide FAQs
Blood sugar improvements begin within days of the first dose. Meaningful HbA1c reduction is typically seen by 12 weeks. Weight loss effects accumulate over 3–6 months. The 0.25 mg starter dose is sub-therapeutic — effects build after escalation to 0.5 mg and above.
Ozempic is FDA-approved for type 2 diabetes only. Wegovy (semaglutide 2.4 mg) is FDA-approved for chronic weight management. Some prescribers prescribe Ozempic off-label for obesity. For FDA-approved weight loss treatment, ask your prescriber about Wegovy. Track either in Shotlee.
Take the missed dose as soon as you remember, provided the next scheduled dose is at least 2 days away. If the next dose is within 2 days, skip the missed dose and resume the regular schedule. Never take two doses in the same week.
Rapid weight loss from any cause can include lean mass loss. Studies show semaglutide users lose approximately 25–40% of lost weight as lean mass, similar to other methods. High protein intake (≥1.2 g/kg body weight) and resistance training are the primary mitigation strategies. Track both weight and measurements in Shotlee to distinguish fat vs mass changes.
Unopened pens: refrigerate at 2–8°C until the expiry date. In-use pen: store at room temperature (below 30°C) or refrigerate for up to 56 days. Never freeze. Protect from light. A travel case with a cool pack is recommended for trips over 30°C.
Track Your Ozempic Protocol in Shotlee
Log every weekly injection, track your weight trend, and monitor side effects — all for free.