Drug Comparison: Zepbound vs Saxenda

Obesity is a significant health concern in the United States, with over 43% of adults aged 18 and older being overweight and 16% living with obesity. This condition heightens the risk of developing serious health issues, such as heart disease, diabetes, and certain cancers. To combat obesity, individuals often turn to lifestyle changes, medications, or surgical interventions.

Among the available treatments, weight-loss injections like Zepbound and Saxenda have become increasingly popular due to their effectiveness in helping individuals manage their weight. In this article, you will learn about the differences and similarities between Zepbound and Saxenda, their mechanisms of action, effectiveness, side effects, and more.

Zepbound vs Saxenda

What Is Zepbound and How Does It Work?

Zepbound is an injectable medication that contains tirzepatide, a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist. Tirzepatide mimics the actions of natural hormones that control insulin and appetite. By activating both GIP and GLP-1 receptors, Zepbound helps reduce food intake by making you feel fuller, slowing down digestion, and improving insulin sensitivity.

Zepbound is indicated for individuals with an initial body mass index (BMI) of:

• • 30 kg/m2 or higher (obesity) or
  • 27 kg/m2 or higher (overweight) in the presence of at least one weight-related comorbid condition, such as hypertension, dyslipidemia, type 2 diabetes mellitus, obstructive sleep apnea, or cardiovascular disease.

For dosing, Zepbound is initiated at 2.5 mg injected subcutaneously once weekly. After four weeks, the dose is increased to 5 mg once weekly. The dosage can be further increased in 2.5 mg increments after at least four weeks at the current dose, depending on the individual’s response and tolerability. The recommended maintenance doses are 5 mg, 10 mg, or 15 mg once weekly, with the maximum dosage being 15 mg per week.

Zepbound should be administered once weekly at any time of day, with or without food. The injection can be given subcutaneously in the abdomen, thigh, or upper arm, with rotation of injection sites recommended with each dose.

What Is Saxenda and How Does It Work?

Saxenda is an injectable medication containing liraglutide, a GLP-1 receptor agonist. Liraglutide mimics the GLP-1 hormone, which is involved in regulating appetite and food intake. When administered, Saxenda slows gastric emptying, increases feelings of fullness, and reduces hunger, leading to a lower overall calorie intake. This mechanism makes Saxenda an effective option for weight loss when used in combination with a reduced-calorie diet and increased physical activity.

Saxenda is approved for use in adults with obesity or overweight with weight-related medical conditions, as well as in adolescents aged 12-17 years who have obesity with an initial body mass index (BMI) of:

• • 30 kg/m2 or greater (obese) (1) or
  • 27 kg/m2 or greater (overweight) in the presence of at least one weight-related comorbid condition (e.g. hypertension, type 2 diabetes mellitus, or dyslipidemia).

The recommended dose of Saxenda is 3 mg per day, and it can be administered at any time of day, regardless of meal timing. The treatment begins with a starting dose of 0.6 mg per day for one week. The dose is then gradually increased at weekly intervals until the target dose of 3 mg is reached. Saxenda is injected subcutaneously, typically in the abdomen, thigh, or upper arm. The injection site and timing can be changed as needed without requiring any adjustment to the dose.

How Effective Is Zepbound Compared to Saxenda for Weight Loss?

Clinical trials and real-world studies have shown that both Zepbound and Saxenda are effective for weight loss, but there are some differences in their outcomes.

Zepbound

People taking Zepbound 15 mg lost up to 48 lbs (~21% weight loss). Individual results may vary. Zepbound helps adults with obesity lose weight and keep it off, delivering significant and sustained weight loss when combined with diet and exercise. It is not intended for cosmetic weight loss.

In a 72-week clinical trial of adults without diabetes:

• • 5 mg dose: Average weight loss of 15.0% (34 lbs)
  • 10 mg dose: Average weight loss of 19.5% (44 lbs)
  • 15 mg dose: Average weight loss of 20.9% (48 lbs)
  • Placebo: Average weight loss of 3.1% (7 lbs)

Average starting weights were 226.8 lbs for the 5 mg group, 233.3 lbs for the 10 mg group, and 232.8 lbs for the 15 mg group.

In a 72-week clinical trial of adults with diabetes:

• • 10 mg dose: Average weight loss of 12.8% (28 lbs)
  • 15 mg dose: Average weight loss of 14.7% (33 lbs)
  • Placebo: Average weight loss of 3.2% (7 lbs)

The average starting weights were 222.4 lbs for the 10 mg group and 219.6 lbs for the 15 mg group. These results suggest that Zepbound can lead to 4-6 times more weight loss than diet and exercise alone.

Saxenda

Saxenda has also been proven effective for weight management, particularly in a study involving adolescents aged 12-17 with obesity. In a 56-week, double-blind, placebo-controlled trial, patients treated with Saxenda achieved the following results:

• • Average reduction in BMI SDS (Body Mass Index Standard Deviation Score): 0.23
  • Average weight loss: 2.65% of body weight

In contrast, patients in the placebo group experienced no reduction in BMI SDS and actually gained an average of 2.37% of their body weight. This data highlights that Saxenda can lead to modest weight loss in adolescents, although the effect size is smaller compared to Zepbound in adults.

What Are the Side Effects of Zepbound and Saxenda?

Both Zepbound and Saxenda are associated with a range of side effects, some of which are common to both medications due to their similar mechanisms of action. However, there are also differences in their side-effect profiles:

Zepbound

Common side effects include:

• • Nausea: Nausea is a frequently reported side effect of Zepbound. It often occurs when starting the medication and may decrease over time.
  • Diarrhea: Diarrhea is another common side effect, which can lead to dehydration if fluids are not adequately replenished.
  • Vomiting: Vomiting is also reported, which can contribute to fluid loss and dehydration.
  • Constipation: Some users experience constipation while on Zepbound.
  • Stomach Pain: Abdominal pain is a known side effect, which may be severe in some cases.
  • Indigestion: Indigestion, or dyspepsia, may occur, causing discomfort in the stomach.
  • Injection Site Reactions: Some people report redness, swelling, or irritation at the injection site.
  • Fatigue: Feeling tired or fatigued is a common experience among those taking Zepbound.
  • Allergic Reactions: Allergic reactions, including rash and itching, can occur.
  • Belching and Heartburn: Some users experience belching and heartburn.
  • Hair Loss: Hair loss has been reported as a side effect.

More serious side effects can include:

• • Severe Stomach Problems: Zepbound can cause severe stomach issues, including severe abdominal pain that may not subside. This requires immediate medical attention.
  • Kidney Problems (Kidney Failure): Dehydration from diarrhea, nausea, or vomiting can lead to kidney problems, including kidney failure.
  • Gallbladder Problems: Zepbound users may experience gallbladder issues, including gallstones, which can require surgical intervention.
  • Pancreatitis: Inflammation of the pancreas (pancreatitis) is a serious side effect. Symptoms include severe, persistent abdominal pain that may radiate to the back.
  • Serious Allergic Reactions: Severe allergic reactions may occur, characterized by swelling of the face, lips, tongue, or throat, difficulty breathing, dizziness, or rapid heartbeat.
  • Low Blood Sugar (Hypoglycemia): When used with other medications that lower blood sugar, such as insulin or sulfonylureas, Zepbound may cause hypoglycemia. Symptoms include dizziness, sweating, confusion, blurred vision, and shakiness.
  • Changes in Vision: Patients with type 2 diabetes may experience changes in vision while using Zepbound.
  • Depression or Suicidal Thoughts: Mental health changes, including depression or suicidal thoughts, have been reported. Any sudden or worsening mood changes should be reported to a healthcare provider immediately.

Saxenda

Common side effects include:

• • Nausea: Nausea is the most common side effect of Saxenda, particularly at the beginning of treatment.
  • Diarrhea: Diarrhea is also frequently reported and can lead to dehydration if not managed properly.
  • Constipation: Constipation may occur in some users.
  • Vomiting: Vomiting is another potential side effect that can contribute to fluid imbalance.
  • Injection Site Reaction: Redness, swelling, or irritation at the injection site is common.
  • Low Blood Sugar (Hypoglycemia): Saxenda can cause low blood sugar, especially in those also taking diabetes medications like sulfonylureas or insulin. Symptoms include shakiness, sweating, dizziness, and fast heartbeat.
  • Headache: Headaches may occur during Saxenda treatment.
  • Upset Stomach (Dyspepsia): Some users report stomach discomfort or indigestion.
  • Fatigue: Feeling unusually tired or fatigued is a reported side effect.
  • Dizziness: Dizziness is another potential side effect of Saxenda.
  • Stomach Pain: Abdominal pain may occur, varying in severity.
  • Change in Enzyme (Lipase) Levels: Saxenda can cause changes in blood enzyme levels, specifically lipase.
  • Fever and Gastroenteritis: In some cases, users may experience fever and symptoms of gastroenteritis.

Serious side effects associated with Saxenda include:

• • Pancreatitis: Similar to Zepbound, Saxenda can cause pancreatitis, characterized by severe and persistent abdominal pain, sometimes radiating to the back.
  • Gallbladder Problems: Gallbladder issues, including gallstones, can occur and may require surgery. Symptoms include upper abdominal pain, jaundice, and clay-colored stools.
  • Increased Risk of Low Blood Sugar (Hypoglycemia): Particularly in adults with type 2 diabetes who are on other diabetes medications, Saxenda increases the risk of hypoglycemia.
  • Increased Heart Rate: Saxenda can raise heart rate even while at rest. Persistent palpitations or a racing heart should be reported to a healthcare provider.
  • Kidney Problems (Kidney Failure): Dehydration caused by nausea, vomiting, or diarrhea can lead to kidney failure. Ensuring adequate fluid intake can help mitigate this risk.
  • Serious Allergic Reactions: Severe allergic reactions, including swelling, difficulty breathing, and rapid heartbeat, require immediate medical attention.
  • Depression or Suicidal Thoughts: As with Zepbound, Saxenda can also affect mood and mental health, leading to depression or suicidal thoughts.

What Are the Warnings for Zepbound and Saxenda?

When considering weight-loss injections like Zepbound and Saxenda, it is crucial to understand the potential risks and warnings associated with these medications. Both treatments have specific health concerns and contraindications that users must be aware of to ensure their safety and effectiveness. Below are the detailed warnings for each medication:

Warnings for Zepbound

Zepbound may cause tumors in the thyroid, including thyroid cancer. Symptoms to watch for include a lump or swelling in the neck, hoarseness, trouble swallowing, or shortness of breath.

Do not use Zepbound if:

• • You or any of your family have had medullary thyroid carcinoma (MTC).
  • You have Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
  • You have had a serious allergic reaction to tirzepatide or any ingredients in Zepbound.

Warnings for Saxenda

Saxenda may cause thyroid C-cell tumors at clinically relevant exposures in both genders of rats and mice. It is unknown whether Saxenda causes thyroid C-cell tumors, including medullary thyroid carcinoma (MTC), in humans. The human relevance of liraglutide-induced rodent thyroid C-cell tumors has not been determined.

Do not use Saxenda if:

• • You or any of your family have ever had MTC.
  • You have MEN 2.
  • You have had a serious allergic reaction to liraglutide or any ingredients in Saxenda.
  • You are pregnant or plan to become pregnant, as Saxenda may harm your unborn baby.

Can You Take Zepbound and Saxenda Together?

No, you should not take Zepbound and Saxenda together. Both medications belong to a class of drugs that act on the same hormonal pathways to regulate appetite and food intake, which could increase the risk of severe side effects, including nausea, vomiting, and potential thyroid or pancreatic issues. Combining these medications could also lead to an overlap in their effects, increasing the risk of hypoglycemia and other complications. Additionally, there is no established safety data supporting the combined use of these drugs.

Can You Switch Between Zepbound and Saxenda?

Yes, you can switch between Zepbound and Saxenda. When switching from one medication to the other, it’s essential to discontinue the first medication completely before starting the new one. This helps prevent overlapping effects and reduces the risk of side effects.

When switching from Saxenda to Zepbound or vice versa, your doctor will typically start you on the lowest dose of the new medication to monitor how your body responds. For example, if you’re switching from Saxenda to Zepbound, you might start with the initial dose of Zepbound (usually 2.5 mg per week) and then gradually increase as tolerated. It’s important to follow the specific dosing schedule provided to ensure a safe transition.

Which Is More Affordable: Zepbound or Saxenda?

Zepbound and Saxenda are both expensive options for weight loss. In the US, the average price for Zepbound is around $1,118 per month, while Saxenda averages $1,660 per month. However, BuyCanadianInsulin.com offers these medications at significantly lower prices, at $515 for a 5-pen pack of Saxenda, and $499.97 for a Zepbound pen. If it’s your first order, you can get an additional 10% off by using the code FIRST10. This makes Saxenda the more affordable option through this platform. Additionally, exploring insurance coverage, discount programs, or manufacturer coupons could further reduce out-of-pocket costs.

Conclusion

Both Zepbound and Saxenda offer effective solutions for weight management, with each medication having its own advantages and potential drawbacks. Zepbound may provide more significant weight loss, particularly in adults, but comes with a higher cost and some unique side effects. Saxenda, on the other hand, is also effective, especially in adolescents, and may be more affordable depending on your location and insurance. When deciding between these options, it’s crucial to consider your specific health needs, potential side effects, and budget. Consulting with your doctor can help you choose the best path for your weight-loss journey.