Tirzepatide and semaglutide are both effective for weight loss, but their dosages differ significantly. In Canada, semaglutide for weight loss is typically dosed at 2.4 mg weekly, while tirzepatide reaches 10 mg or 15 mg weekly. This article compares the two medications, their dosing schedules, and what Canadian patients can expect.
How Tirzepatide and Semaglutide Work
Both drugs mimic natural gut hormones to reduce appetite and slow stomach emptying. Semaglutide is a GLP-1 receptor agonist, while tirzepatide is a dual GIP and GLP-1 receptor agonist. This dual action may explain tirzepatide's greater weight loss in clinical trials.
In the SURMOUNT-1 trial, tirzepatide 15 mg led to an average 20.9% body weight reduction over 72 weeks. Semaglutide 2.4 mg in the STEP 1 trial produced 14.9% weight loss over 68 weeks. These are not head-to-head studies, but they show tirzepatide's potential edge.
Tirzepatide Dosage for Weight Loss
Tirzepatide is sold as Mounjaro for type 2 diabetes and Zepbound for weight loss. The weight loss dose starts at 2.5 mg once weekly for four weeks. Then the dose increases every four weeks: 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg.
Most patients do not need the maximum dose. Many lose significant weight at 10 mg or 12.5 mg. The goal is to find the lowest effective dose to minimize side effects. Canadian prescribers often follow the same titration schedule as the US.
If you miss a dose, take it as soon as possible within 4 days. If more than 4 days have passed, skip the missed dose and take the next one on the regular day. Never double up doses.
Semaglutide Dosage for Weight Loss
Semaglutide for weight loss is sold as Wegovy. The starting dose is 0.25 mg once weekly for four weeks. Then the dose increases every four weeks: 0.5 mg, 1 mg, 1.7 mg, and finally 2.4 mg. The 2.4 mg maintenance dose is the only one proven for weight loss in clinical trials.
Some patients experience nausea at higher doses. Slower titration or staying at a lower dose for longer may help. Semaglutide is also available as Ozempic for diabetes, but the weight loss dose is higher.
In Canada, Wegovy is approved for chronic weight management. Ozempic is approved for type 2 diabetes but is sometimes used off-label for weight loss. However, the doses are not interchangeable.
Key Differences in Dosing
The main difference is the maximum dose: 15 mg for tirzepatide versus 2.4 mg for semaglutide. Tirzepatide has more titration steps, which may allow finer control. Semaglutide has a simpler schedule with only four dose levels.
Both drugs are injected subcutaneously once weekly. They can be taken with or without food. Neither requires dose adjustment for mild kidney or liver impairment.
Cost is another factor. In Canada, tirzepatide is generally more expensive than semaglutide. Private insurance coverage varies widely. Some provincial drug plans cover semaglutide for diabetes but not for weight loss alone.
Which One Is Better for Weight Loss?
Clinical trials suggest tirzepatide leads to greater weight loss on average. A 2023 meta-analysis found tirzepatide 15 mg reduced body weight by 17.8% compared to 12.4% for semaglutide 2.4 mg. However, individual responses vary.
Side effect profiles are similar: nausea, vomiting, diarrhea, and constipation. Tirzepatide may cause slightly more gastrointestinal upset at higher doses. Both carry a risk of gallbladder disease and pancreatitis.
For patients who do not tolerate one drug, switching to the other may help. Some Canadian clinics offer both options. Discuss with your doctor which is best for your health profile.
Dosage Adjustments and Special Populations
Patients with type 2 diabetes may need different titration. When starting tirzepatide, insulin doses may need reduction to avoid hypoglycemia. Semaglutide has similar considerations.
For older adults, no dose adjustment is required, but slower titration may reduce side effects. Both drugs are not recommended during pregnancy or breastfeeding.
If you are switching from semaglutide to tirzepatide, start at the lowest tirzepatide dose. Do not assume you can start at a higher dose because you tolerated semaglutide.
Where to Get These Medications in Canada
Both tirzepatide and semaglutide require a prescription from a Canadian licensed healthcare provider. Telehealth services are popular for weight loss consultations. Some pharmacies compound semaglutide, but Health Canada warns against unapproved compounded versions.
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Common Questions About Dosing
Can you take tirzepatide and semaglutide together? No, they should not be combined. Both act on similar receptors and could cause severe side effects.
What if you miss a dose? For both drugs, if you miss a dose and the next scheduled dose is more than 48 hours away, take the missed dose. Otherwise, skip it.
How long do you stay on the medication? Weight loss medications are often long-term. Stopping usually leads to weight regain. Maintenance doses may be lower than the maximum.
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Cost Comparison in Canada
Wegovy (semaglutide 2.4 mg) costs approximately $400 to $500 per month without insurance. Zepbound (tirzepatide) is not yet widely available in Canada, but Mounjaro for diabetes costs about $350 to $450 per month. Some patients use lower doses to reduce cost, but this may reduce effectiveness.
Private insurance plans may cover one or both drugs for weight loss if certain criteria are met. Public drug plans in most provinces do not cover weight loss medications. Check with your insurer before starting.
Final Thoughts on Tirzepatide vs Semaglutide Dosage
Tirzepatide offers a higher maximum dose and potentially greater weight loss, but semaglutide has a simpler dosing schedule and more long-term safety data. Both require weekly injections and gradual dose increases. In Canada, access and cost may be the deciding factors for many patients.
Talk to your doctor about which medication fits your goals and medical history. Never adjust your dose without medical supervision. For more on related research peptides, BPC-157 TB-500 blend dosage in Canada covers another popular peptide combination.
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