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
Adipex
Victoza vs. Adipex Dosage
Victoza
Adipex
| 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 |
| 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
| 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
| 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
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