Wegovy vs. Adipex

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

Key Takeaways

  • Wegovy is a once-weekly injection approved for long-term weight management and cardiovascular risk reduction, while Adipex is a short-term daily pill for obesity only.

  • Wegovy causes mostly digestive side effects like nausea, while Adipex works as a stimulant and can cause insomnia and restlessness.

  • Adipex is far less expensive but is only meant for a few weeks of use, whereas Wegovy is approved for ongoing, chronic treatment.

Wegovy vs. Adipex Drug Summary

Wegovy

Wegovy is a GLP-1 receptor agonist given as a once-weekly subcutaneous injection. It is FDA-approved for chronic weight management in adults and adolescents with obesity or overweight, and to lower cardiovascular risk in adults with established heart disease. Dosing starts low and increases every four weeks up to a 2.4 mg maintenance dose.

Adipex

Adipex is a stimulant-class appetite suppressant taken as a daily oral tablet. It is FDA-approved only for short-term use, typically a few weeks, alongside diet and exercise for obesity. Common doses range from 15 mg to 37.5 mg once daily, with some regimens split into two smaller doses.

Wegovy vs. Adipex Side Effects

Wegovy

Most common
Nausea (up to 44%)
Diarrhea (up to 30%)
Vomiting (up to 24%)
Constipation (up to 24%)

Adipex

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

Wegovy vs. Adipex Dosage

Wegovy

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 0.25 mg once weekly Weeks 1-4
Maximum dose 2.4 mg once weekly Week 17 onward
Dose changes 4 increases Every 4 weeks

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

Wegovy vs. Adipex Indications

Wegovy

Wegovy is approved for chronic weight management in adults and adolescents aged 12 and older who have obesity or overweight with at least one weight-related condition, used alongside diet and exercise. It is also approved to reduce the risk of major cardiovascular events like heart attack and stroke in adults with obesity or overweight and known heart disease. This dual approval sets it apart from most other weight-loss medications.

  • Chronic (long-term) weight management

  • Adults and adolescents 12+ with obesity/overweight

  • Used with diet and exercise

  • Reduces cardiovascular risk in adults with heart disease

Adipex

Adipex is approved only for short-term use, generally a few weeks, as an adjunct to diet and exercise for weight loss in adults with obesity. It is not approved for long-term or chronic weight management, unlike GLP-1 medications. Adipex is also not approved for use in patients 16 and younger.

  • Short-term weight loss (a few weeks)

  • Adults with obesity

  • Used with diet and exercise

  • Not approved for chronic use

Wegovy vs. Adipex Pros and Cons

Wegovy

Wegovy produces substantial weight loss and is one of the few obesity medications with proven cardiovascular benefit. It requires weekly injections and carries a boxed warning for thyroid tumor risk seen in animal studies. Insurance coverage varies widely, and out-of-pocket costs can be significant.

Pros

  • Approved for long-term, chronic weight management

  • Only anti-obesity drug shown to lower cardiovascular risk

  • Once-weekly dosing

  • Approved for adolescents 12 and older

Cons

  • GI side effects like nausea and vomiting are common

  • Requires injection rather than a pill

  • Boxed warning for thyroid C-cell tumor risk

  • Typically costs $1,300 to $1,350 per month without insurance

Adipex

Adipex is inexpensive and easy to take as a daily pill, backed by decades of clinical use. It is only approved for short-term treatment and carries risks related to its stimulant effects and abuse potential. Patients with heart disease or uncontrolled blood pressure cannot use it.

Pros

  • Oral tablet, no injections needed

  • Decades of clinical use and prescribing experience

  • Typically costs $50 to $150 per month without insurance

  • Simple once- or twice-daily dosing

Cons

  • Only approved for short-term use (a few weeks)

  • Schedule IV controlled substance with abuse potential

  • Contraindicated in patients with heart disease or uncontrolled hypertension

  • Can cause insomnia and restlessness from stimulant effects

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