Victoza vs. Adipex

See how Victoza and Adipex compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Victoza is a daily injectable GLP-1 drug approved for type 2 diabetes and cardiovascular risk reduction, not for weight loss.

  • Adipex is an oral stimulant pill approved only for a few weeks of weight loss and carries controlled-substance abuse risk.

  • The two drugs work through completely different mechanisms and are approved for different medical purposes, so they aren't interchangeable options.

Victoza vs. Adipex Drug Summary

Victoza

Victoza (liraglutide) is a GLP-1 receptor agonist used to improve blood sugar control in adults and children with type 2 diabetes, and to lower cardiovascular risk in adults with existing heart disease. It's given as a once-daily injection under the skin, starting low and increasing over three weeks to a maintenance dose of 1.2 mg or 1.8 mg. Weight loss can occur as a side effect, but Victoza itself is not FDA-approved for weight management.

Adipex

Adipex (phentermine) is a stimulant-class appetite suppressant approved for short-term weight loss alongside diet and exercise. It's taken orally, once or twice a day, at doses ranging from 15 mg to 37.5 mg depending on the formulation and kidney function. As a Schedule IV controlled substance with cardiovascular risks, it's intended for only a few weeks of use, not ongoing therapy.

Victoza vs. Adipex Side Effects

Victoza

Most common
diarrhea (up to 11.7%)
nausea (≥5%)
vomiting (≥5%)
decreased appetite (≥5%)

Adipex

Most common
insomnia (not specified)
dizziness (not specified)
restlessness (not specified)
dry mouth (not specified)

Victoza vs. Adipex Dosage

Victoza

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 0.6 mg once daily Week 1
Maximum dose 1.8 mg once daily Week 3 onward
Dose changes 2 increases Every week

Adipex

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 37.5 mg once daily At the start
Maximum dose 15 mg once daily If needed
Dose changes 3 increases As tolerated

Victoza vs. Adipex Indications

Victoza

Victoza is approved to improve blood sugar control in adults and children age 10 and older with type 2 diabetes, used alongside diet and exercise. It's also approved to reduce the risk of major cardiovascular events, such as heart attack and stroke, in adults with type 2 diabetes and established heart disease. It is not approved for type 1 diabetes or for weight loss on its own.

  • Type 2 diabetes in adults and children 10 and older

  • Reduces cardiovascular event risk in adults with heart disease

  • Used as an adjunct to diet and exercise

  • Not approved for type 1 diabetes

  • Weight loss use is off-label (Saxenda is the approved version)

Adipex

Adipex is approved only for short-term weight loss, generally a few weeks, in combination with diet and exercise for people with obesity. It is not intended for chronic or repeated long-term use. It's also not approved for use in patients age 16 or younger.

  • Short-term weight loss in adults with obesity

  • Used with diet and exercise for a few weeks only

  • Not approved for long-term or chronic weight management

  • Not approved for patients 16 or younger

  • Longer-term use beyond labeling is considered off-label

Victoza vs. Adipex Pros and Cons

Victoza

Victoza carries a boxed warning for thyroid C-cell tumors seen in animal studies and requires a daily injection, but it offers proven cardiovascular benefits for adults with type 2 diabetes and existing heart disease. As a brand-name injectable, it tends to cost significantly more per month than older oral generics.

Pros

  • Proven to reduce cardiovascular events in high-risk adults

  • Approved for pediatric type 2 diabetes patients 10 and older

  • Not a controlled substance, no abuse potential

  • Can be used long-term as part of diabetes management

Cons

  • Boxed warning for thyroid C-cell tumor risk

  • Requires a daily injection rather than a pill

  • Risk of acute pancreatitis

  • Costs roughly $935 to $1,470 per month without insurance

Adipex

Adipex is an inexpensive, oral option for short-term weight loss, but its stimulant effects and abuse potential make it unsuitable for people with cardiovascular disease or a history of substance misuse. It's approved for only a few weeks of use, unlike GLP-1 drugs meant for ongoing therapy.

Pros

  • Oral tablet, no injections needed

  • Costs roughly $50 to $150 per month, far less than Victoza

  • Fast-acting appetite suppression

  • Long track record of use since 1959

Cons

  • Schedule IV controlled substance with abuse potential

  • Contraindicated with heart disease or uncontrolled hypertension

  • Only approved for a few weeks, not chronic use

  • Risk of insomnia and restlessness from stimulant effect

Common Symptoms and Related Diseases You Can Explore

Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.