Semaglutide 5mg dosage for weight loss in Canada typically starts at 0.25 mg once weekly, then increases every four weeks to a maintenance dose of 2.4 mg. The number of units you inject depends on the concentration of your specific vial, but a common 5 mg vial reconstituted with 2 mL of bacteriostatic water yields 0.25 mg per 10 units on an insulin syringe. This guide breaks down exactly how many units to inject at each step, based on standard compounding practices in Canada.
What Is Semaglutide and How Does It Work for Weight Loss?
Semaglutide is a GLP-1 receptor agonist originally developed for type 2 diabetes. It mimics the hormone glucagon-like peptide-1, which slows gastric emptying, reduces appetite, and increases insulin secretion after meals. For weight loss, semaglutide is prescribed at higher doses than for diabetes. In Canada, Health Canada approved semaglutide 2.4 mg weekly under the brand name Wegovy in 2021. However, many Canadians access compounded semaglutide in 5 mg vials for cost savings or supply reasons.
The medication works on brain receptors that regulate hunger and satiety. Clinical trials showed an average weight loss of 14.9% over 68 weeks at the 2.4 mg dose. The 5 mg vial is not a single dose; it is a multi-dose vial that you draw from weekly. Understanding the math is essential to avoid underdosing or overdosing.
Semaglutide 5mg Dosage Schedule for Weight Loss
The standard titration schedule for semaglutide weight loss is the same whether you use a 5 mg vial or a pre-filled pen. You start low and go slow to minimize nausea and other gastrointestinal side effects. Here is the typical four-week escalation:
- Weeks 1-4: 0.25 mg once weekly
- Weeks 5-8: 0.5 mg once weekly
- Weeks 9-12: 1.0 mg once weekly
- Weeks 13-16: 1.7 mg once weekly
- Week 17 onward: 2.4 mg once weekly (maintenance)
Some Canadian clinics may adjust this schedule based on individual tolerance. If side effects are severe, you may stay at a lower dose longer. Never jump from 0.25 mg to 1.0 mg without medical guidance.
How Many Units to Inject from a 5mg Semaglutide Vial
The number of units depends on how much bacteriostatic water you use to reconstitute the powder. A common method is to add 2 mL of diluent to a 5 mg vial. That gives a concentration of 2.5 mg per mL. Since 1 mL equals 100 units on an insulin syringe, each unit contains 0.025 mg of semaglutide. Here is the unit conversion for that concentration:
- 0.25 mg dose = 10 units
- 0.5 mg dose = 20 units
- 1.0 mg dose = 40 units
- 1.7 mg dose = 68 units
- 2.4 mg dose = 96 units
If you reconstitute with 1 mL instead, the concentration doubles to 5 mg per mL. Then 0.25 mg equals 5 units, 0.5 mg equals 10 units, and so on. Always check your vial's label or ask your pharmacist for the exact concentration. Using the wrong unit count can lead to a 10-fold dosing error.
Example Calculation for a 5mg Vial with 2mL Diluent
Suppose your pharmacy compounds semaglutide 5 mg with 2 mL of bacteriostatic water. You want to inject 0.5 mg for week 5. The concentration is 2.5 mg/mL. Divide the desired dose by the concentration: 0.5 mg divided by 2.5 mg/mL equals 0.2 mL. Multiply by 100 to get units: 0.2 mL times 100 equals 20 units. Draw 20 units on a U-100 insulin syringe.
Where to Buy Semaglutide 5mg in Canada
You can buy semaglutide 5 mg from licensed compounding pharmacies in Canada with a valid prescription. Many telehealth platforms offer online consultations and ship directly to your home. Prices vary widely. A 5 mg vial typically costs between $150 and $300 CAD, depending on the pharmacy and province. For comparison, a month of brand-name Wegovy at 2.4 mg costs around $400 to $500 CAD without insurance. Compounded semaglutide is not identical to the brand product, but many patients find it effective and more affordable.
When buying semaglutide 5 mg in Canada, verify that the pharmacy is licensed by a provincial regulatory authority. Avoid unregulated online sellers that do not require a prescription. Counterfeit or contaminated vials are a real risk. A legitimate Canadian pharmacy will provide a lot number, expiry date, and storage instructions.
Semaglutide Weight Loss Canada: What Results to Expect
In Canadian clinical practice, patients on semaglutide 2.4 mg weekly lose an average of 5 to 10 percent of body weight in the first three months. By six months, many reach 10 to 15 percent. Individual results depend on diet, exercise, and adherence. Semaglutide is not a magic shot. It works best with a reduced-calorie diet and increased physical activity.
Some patients notice appetite suppression within the first week at 0.25 mg. Others need to reach 1.0 mg or higher before feeling a significant effect. Patience is key. The full weight loss effect usually plateaus after 12 to 18 months. After stopping semaglutide, weight regain is common if lifestyle changes are not maintained.
Common Side Effects and How to Manage Them
Nausea is the most common side effect, affecting up to 44 percent of users. It is usually worst during the first few weeks and after each dose increase. To reduce nausea:
- Inject in the evening before bed
- Eat smaller, low-fat meals
- Avoid fried or spicy foods
- Stay hydrated
- Ask your doctor about anti-nausea medication if needed
Other side effects include vomiting, diarrhea, constipation, and abdominal pain. These often improve over time. Serious but rare side effects include pancreatitis, gallbladder disease, and kidney injury. Seek immediate medical attention for severe abdominal pain, persistent vomiting, or signs of an allergic reaction.
Semaglutide vs Other Weight Loss Peptides in Canada
Semaglutide is often compared to tirzepatide, another GLP-1 agonist that also targets GIP receptors. Tirzepatide tends to produce slightly more weight loss but is more expensive and less available in Canada. For those seeking alternatives, peptides like tesamorelin and CJC-1295 are sometimes used off-label for fat loss, though evidence is weaker. You can read about tesamorelin dosage for fat loss in Canada to compare. If you are interested in growth hormone secretagogues, our guide on CJC-1295 vs Ipamorelin for weight loss explains the differences.
For muscle recovery alongside weight loss, BPC-157 is a popular choice. Learn about BPC-157 5mg dosage for muscle recovery if you are also training. These peptides work through different mechanisms and are not substitutes for semaglutide.
How to Inject Semaglutide Safely
Semaglutide is injected subcutaneously, meaning into the fatty tissue just under the skin. Common sites are the abdomen, thigh, or upper arm. Rotate injection sites each week to prevent lipohypertrophy. Use a new, sterile insulin syringe for every injection. Clean the vial top with an alcohol swab before drawing. Clean your skin with another swab before injecting.
To draw the correct dose, first inject air equal to your dose into the vial. Then invert the vial and pull back the plunger to your target units. Tap the syringe to remove air bubbles. Push the plunger slightly to expel air. Inject at a 90-degree angle if you have enough fat, or 45 degrees if you are lean. Press the plunger slowly, then hold for 5 seconds before withdrawing.
Storing Your 5mg Semaglutide Vial
Unopened semaglutide powder can be stored at room temperature away from light. Once reconstituted with bacteriostatic water, keep the vial in the refrigerator at 2 to 8 degrees Celsius. Do not freeze. Use within 28 to 56 days, depending on the pharmacy's instructions. Some compounded semaglutide may have a shorter beyond-use date. Always check the label. Discard any vial that appears cloudy, discolored, or contains particles.
Frequently Asked Questions About Semaglutide 5mg Dosage
Can I start semaglutide at 0.5 mg instead of 0.25 mg?
No. Starting at 0.5 mg greatly increases the risk of severe nausea and vomiting. The 0.25 mg starting dose is designed to let your body adjust. Even if you feel fine at 0.25 mg, follow the four-week titration schedule unless your doctor says otherwise.
What if I miss a dose?
If you miss a dose and it has been less than 5 days, take it as soon as you remember. If more than 5 days have passed, skip the missed dose and take your next scheduled dose. Do not double up. If you miss two or more doses, contact your healthcare provider before restarting, as you may need to go back to a lower dose.
How long does a 5mg vial last?
At the full 2.4 mg weekly dose, a 5 mg vial contains about two weeks of medication. During the titration phase, one vial can last much longer. For example, at 0.25 mg weekly, a 5 mg vial would theoretically last 20 weeks, but you must discard it after the beyond-use date, usually 28 to 56 days after reconstitution.
Is semaglutide legal in Canada for weight loss?
Yes. Health Canada approved semaglutide 2.4 mg for chronic weight management in adults with a BMI of 30 or higher, or 27 or higher with at least one weight-related condition. Compounded semaglutide is legal when prescribed by a licensed practitioner and prepared by a licensed compounding pharmacy.
Final Word on Semaglutide 5mg Units to Inject
Semaglutide 5 mg dosage for weight loss in Canada follows a clear weekly titration from 0.25 mg to 2.4 mg. The units you inject depend entirely on your vial's concentration. With a standard 2 mL reconstitution, 0.25 mg equals 10 units, and 2.4 mg equals 96 units. Always confirm the concentration with your pharmacist before drawing. Start low, go slow, and pair the medication with healthy habits for the best results. If you are also exploring peptides for recovery, check out our guide on peptides for muscle recovery in Quebec to see how they fit into a broader regimen.