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

Most common
Nausea (up to 39.3%)
Diarrhea (up to 20.9%)
Constipation (up to 19.4%)
Vomiting (up to 15.7%)

Adipex

Most common
Insomnia (not specified)
Dizziness (not specified)
Restlessness (not specified)
Dry mouth (not specified)

Saxenda vs. Adipex Dosage

Saxenda

Dosage
Dosage Table
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

Dosage
Dosage Table
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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