Semaglutide dosage Canada for weight loss starts at 0.25 mg once weekly, then increases every four weeks to a maintenance dose of 2.4 mg. This guide covers the full titration schedule, how to adjust for side effects, and what to expect at each step. Whether you are new to GLP-1 peptides or switching from another medication, understanding the dosing roadmap helps you use semaglutide safely and effectively.
Semaglutide Starting Dose for Weight Loss
The starting dose of semaglutide for weight loss is 0.25 mg injected subcutaneously once per week. This low dose is not meant to produce significant weight loss on its own. Instead, it allows your body to adapt to the medication and reduces the risk of nausea and other gastrointestinal side effects. You stay on 0.25 mg for four weeks before increasing.
In Canada, semaglutide is available under the brand name Wegovy for chronic weight management. The dosing schedule is identical to the one used in clinical trials. Some people may be prescribed Ozempic off-label for weight loss, but the titration remains the same. Always follow your prescriber's instructions, as individual needs vary.
Semaglutide Titration Schedule: Week by Week
The standard semaglutide titration schedule increases the dose every four weeks. This gradual approach gives your digestive system time to adjust. Here is the full schedule used in the STEP trials and recommended by Health Canada:
- 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 dose)
Some people respond well to lower doses and may not need to reach 2.4 mg. Your doctor may pause the titration if you are losing weight steadily or experiencing side effects. Do not skip doses or increase faster than prescribed. The four-week intervals are designed to minimize nausea and vomiting.
Maintenance Dose and Long-Term Use
The maintenance dose of semaglutide for weight loss is 2.4 mg once weekly. At this dose, clinical trials showed an average weight loss of about 15% of body weight over 68 weeks. However, not everyone needs the maximum dose. Some people maintain significant weight loss at 1.0 mg or 1.7 mg.
Once you reach your goal weight, you may stay on the maintenance dose indefinitely. Semaglutide is intended for long-term use, as stopping the medication often leads to weight regain. If you need to stop, your doctor will guide you on tapering or alternative strategies. Never abruptly discontinue without medical advice.
How to Inject Semaglutide Correctly
Semaglutide is injected under the skin (subcutaneously) in the abdomen, thigh, or upper arm. Rotate injection sites each week to avoid lipodystrophy or skin irritation. The medication comes in a pre-filled pen with a very fine needle. Most people find the injection nearly painless.
Inject semaglutide on the same day each week, at any time of day, with or without food. If you miss a dose and the next scheduled dose is more than 48 hours away, take the missed dose as soon as possible. If it is less than 48 hours until your next dose, skip the missed dose and resume your regular schedule. Do not double up.
Adjusting Semaglutide Dose for Side Effects
Nausea is the most common side effect of semaglutide, especially during dose increases. If nausea is severe, your doctor may slow the titration schedule. For example, you might stay on 0.5 mg for six or eight weeks instead of four. Some people split the weekly dose into two smaller injections, but this is not standard practice and should only be done under medical supervision.
Other common side effects include diarrhea, constipation, vomiting, and abdominal pain. These usually improve within a few weeks. Eating smaller meals, avoiding high-fat foods, and staying hydrated can help. If side effects persist or become intolerable, contact your healthcare provider. They may lower your dose temporarily or prescribe an anti-nausea medication.
Semaglutide Dosage for Different Populations
For people with type 2 diabetes, the starting dose is the same 0.25 mg weekly, but the maintenance dose for glycemic control is typically 1.0 mg or 2.0 mg (Ozempic). For weight loss without diabetes, the target is 2.4 mg (Wegovy). Your doctor will consider your medical history, kidney function, and other medications when determining your final dose.
Older adults and those with mild kidney impairment do not require dose adjustments. However, semaglutide is not recommended for people with a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2. Always disclose your full medical history before starting treatment.
Semaglutide Weight Loss Dose: What the Research Shows
Clinical trials provide clear evidence for the semaglutide weight loss dose of 2.4 mg weekly. In the STEP 1 trial, participants lost an average of 14.9% of their body weight after 68 weeks, compared to 2.4% with placebo. Over one-third of participants lost at least 20% of their body weight. These results are among the highest seen with any weight loss medication.
Lower doses also produce meaningful weight loss. In a dose-finding study, 1.0 mg weekly led to about 10% weight loss, and 1.7 mg led to about 12%. The dose-response relationship is clear, but individual variation is significant. Some people are hyper-responders and lose substantial weight on 0.5 mg, while others need the full 2.4 mg to see results.
Semaglutide Dosage Canada: Availability and Cost
In Canada, semaglutide for weight loss is available by prescription as Wegovy. It is not covered by all provincial drug plans, and private insurance coverage varies. The cash price for a month of Wegovy at the maintenance dose is approximately $400 to $500 CAD. Some patients may qualify for patient assistance programs.
Ozempic, which contains the same active ingredient, is approved for type 2 diabetes but is sometimes prescribed off-label for weight loss. The cost is similar. If you are considering buying semaglutide online, be extremely cautious. Only purchase from licensed Canadian pharmacies with a valid prescription. Counterfeit semaglutide is a growing problem, and unregulated sources may sell unsafe products.
Frequently Asked Questions About Semaglutide Dosing
Can I start semaglutide at a higher dose to lose weight faster?
No. Starting at a higher dose dramatically increases the risk of severe nausea, vomiting, and dehydration. The titration schedule exists for your safety. Rapid dose escalation can also lead to pancreatitis or gallbladder problems in rare cases. Follow the prescribed schedule exactly.
What if I miss a dose of semaglutide?
If you miss a dose and your next scheduled dose is more than 48 hours away, take the missed dose as soon as you remember. If it is less than 48 hours until your next dose, skip the missed dose and take your next dose on the regular day. Never take two doses within 48 hours.
How long does it take for semaglutide to work for weight loss?
Most people notice reduced appetite within the first few weeks, even on the starting dose. Significant weight loss typically begins after reaching 1.0 mg or higher, around week 9 to 12. Full effects are seen after several months on the maintenance dose.
Can I stop semaglutide once I reach my goal weight?
Stopping semaglutide usually leads to weight regain. In clinical trials, participants who stopped the medication regained about two-thirds of the weight they had lost within one year. Semaglutide is intended for long-term use. If you want to stop, work with your doctor on a transition plan.
Comparing Semaglutide to Other GLP-1 Peptides
Semaglutide is not the only GLP-1 receptor agonist used for weight loss. Tirzepatide, a dual GIP/GLP-1 agonist, produces even greater weight loss in clinical trials, with an average of 20% or more. However, tirzepatide is not yet approved for weight loss in Canada as of early 2025, though it is available for diabetes as Mounjaro.
Liraglutide (Saxenda) is an older daily GLP-1 agonist with more modest weight loss, around 8% on average. Semaglutide offers a convenient once-weekly injection and superior efficacy. Your choice will depend on availability, cost, insurance coverage, and your individual response. Discuss all options with your healthcare provider.
For those interested in other peptide therapies, understanding proper dosing is critical. For example, the BPC-157 TB-500 blend dosage calculator provides a similar step-by-step approach for muscle recovery peptides. While the mechanisms differ, the principle of careful titration applies across peptide therapeutics.
Safety Considerations for Semaglutide Use
Semaglutide is generally well tolerated, but serious side effects can occur. Pancreatitis, gallbladder disease, and kidney injury have been reported. Symptoms like severe abdominal pain, persistent vomiting, or signs of dehydration require immediate medical attention. Semaglutide also carries a boxed warning for thyroid C-cell tumors in rodents, though this has not been confirmed in humans.
Do not use semaglutide if you are pregnant or planning to become pregnant. It should be discontinued at least two months before a planned pregnancy. Breastfeeding is not recommended while using semaglutide. Always inform all your healthcare providers that you are taking this medication, especially before any surgery or procedure.
Monitoring Your Progress on Semaglutide
Regular follow-up with your prescriber is essential. Your doctor will monitor your weight, blood pressure, blood sugar, and kidney function. They may adjust your dose based on your response and side effects. Keep a log of your weekly injections, any symptoms, and your weight.