Saxenda vs. Adipex
See how Saxenda and Adipex compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Saxenda is a daily GLP-1 injection approved for long-term weight management, while Adipex is a pill meant only for short-term use.
Saxenda works by mimicking a gut hormone that reduces appetite, while Adipex is a stimulant that suppresses appetite through the central nervous system.
Adipex costs far less per month than Saxenda but carries abuse potential and cardiovascular restrictions that limit who can safely use it.
Saxenda vs. Adipex Drug Summary
Saxenda
Saxenda (liraglutide) is a GLP-1 receptor agonist approved for chronic weight management in adults with obesity or overweight plus a weight-related condition, and in adolescents 12 to 17. It is injected under the skin once a day, with the dose increased gradually over about a month.
Adipex
Adipex (phentermine) is a stimulant-type appetite suppressant approved only for short-term use, typically a few weeks, alongside diet and exercise. It is taken as a once-daily oral tablet or capsule and has been prescribed since 1959.
Saxenda vs. Adipex Side Effects
Saxenda
Adipex
Saxenda vs. Adipex Dosage
Saxenda
Adipex
| STAGE | DOSE | WHEN |
| Starting dose | 0.6 mg once daily | Week 1 |
| Maximum dose | 3 mg once daily | Week 5 onward |
| Dose changes | 4 increases | Every week |
| STAGE | DOSE | WHEN |
| Starting dose | 18.75 mg once daily | At the start |
| Maximum dose | 15 mg once daily | If needed |
| Dose changes | 3 increases | As tolerated |
Saxenda
| STAGE | DOSE | WHEN |
| Starting dose | 0.6 mg once daily | Week 1 |
| Maximum dose | 3 mg once daily | Week 5 onward |
| Dose changes | 4 increases | Every week |
Adipex
| STAGE | DOSE | WHEN |
| Starting dose | 18.75 mg once daily | At the start |
| Maximum dose | 15 mg once daily | If needed |
| Dose changes | 3 increases | As tolerated |
Saxenda vs. Adipex Indications
Saxenda
Saxenda is FDA-approved for chronic weight management, meaning it is meant to be used long-term alongside diet and exercise. It is approved for adults with obesity, or overweight with a related condition like high blood pressure, and for teens 12 to 17 with obesity.
Adults with obesity (BMI 30+)
Adults who are overweight with a weight-related condition
Adolescents 12-17 with obesity
Not approved for treating type 1 or type 2 diabetes
Adipex
Adipex is FDA-approved only for short-term use, generally just a few weeks, as an add-on to diet and exercise for weight loss. It is not intended for ongoing or chronic weight management.
Adults with obesity as a short-term diet aid
Not approved for long-term weight management
Not approved for patients 16 and younger
Often used for a few weeks at the start of a weight-loss plan
Saxenda vs. Adipex Pros and Cons
Saxenda
Saxenda's GLP-1 mechanism supports sustained appetite reduction and is backed by data for continued use over months to years. It requires a daily injection and carries a boxed warning for thyroid C-cell tumors, and it costs substantially more out of pocket than older weight-loss pills.
Pros
Approved for long-term, ongoing weight management
Also approved for adolescents 12 to 17
Not a controlled substance, no abuse potential
Appetite reduction tends to be more consistent day to day
Cons
Requires a daily self-injection
Boxed warning for thyroid C-cell tumor risk in animal studies
Common GI side effects like nausea and vomiting
Roughly $1,300 to $1,350 per month without insurance
Adipex
Adipex works quickly as an appetite suppressant but is only intended for short courses of treatment. It is not appropriate for anyone with cardiovascular disease and, as a Schedule IV drug, carries some risk of dependence.
Pros
Oral tablet, no injections needed
Decades of real-world prescribing history
Roughly $50 to $150 per month without insurance
Multiple dose strengths allow flexible adjustment
Cons
Only approved for a few weeks of use
Schedule IV controlled substance with abuse potential
Contraindicated with heart disease or uncontrolled hypertension
Not suitable for sustained, long-term weight management
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