Farxiga vs. Phentermine

See how Farxiga and Phentermine compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Farxiga is approved for long-term management of type 2 diabetes, heart failure, and chronic kidney disease, while phentermine is approved only for short-term weight loss.

  • Farxiga's main risks are genital yeast infections and dehydration, while phentermine carries risks of elevated heart rate, blood pressure, and dependence.

  • Farxiga is a non-controlled daily tablet costing far more per month than generic phentermine, a Schedule IV stimulant.

Farxiga vs. Phentermine Drug Summary

Farxiga

Farxiga (dapagliflozin) is an SGLT2 inhibitor that lowers blood sugar by causing the kidneys to remove excess glucose in the urine. It is FDA-approved for type 2 diabetes, heart failure, and chronic kidney disease, and is taken as one tablet by mouth once a day.

Phentermine

Phentermine is a sympathomimetic amine that suppresses appetite by acting on the central nervous system in a way similar to amphetamines. It is FDA-approved only for short-term weight loss alongside diet and exercise, and is taken as one tablet or capsule by mouth once a day.

Farxiga vs. Phentermine Side Effects

Farxiga

Most common
Female genital mycotic infections (up to 6.9%)
Nasopharyngitis (up to 6.3%)
Urinary tract infections (up to 4.3%)
Back pain (up to 4.2%)

Phentermine

Most common
Insomnia (reported)
Dry mouth (reported)
Palpitation (reported)
Elevation of blood pressure (reported)

Farxiga vs. Phentermine Dosage

Farxiga

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 5 mg once daily At the start
Maximum dose 10 mg once daily If needed
Dose changes 1 increase As tolerated

Phentermine

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 15 mg once daily At the start
Maximum dose 37.5 mg once daily If needed
Dose changes 1 increase As tolerated

Farxiga vs. Phentermine Indications

Farxiga

Farxiga is approved to control blood sugar in adults and children 10 and older with type 2 diabetes. It also reduces the risk of hospitalization for heart failure and slows kidney function decline in chronic kidney disease, independent of diabetes status.

  • Type 2 diabetes blood sugar control (ages 10+)

  • Heart failure hospitalization and mortality risk reduction

  • Chronic kidney disease progression risk reduction

  • Not approved for type 1 diabetes or weight loss

Phentermine

Phentermine is approved as a short-term adjunct, meant for only a few weeks, for weight reduction in adults with obesity or with a lower BMI plus other risk factors. It is meant to be combined with reduced-calorie diet, exercise, and behavior changes, not used alone or long-term.

  • Short-term weight loss adjunct (a few weeks only)

  • For BMI 30+ or BMI 27+ with other risk factors

  • Used with diet, exercise, and behavior modification

  • Not approved for long-term weight management

Farxiga vs. Phentermine Pros and Cons

Farxiga

Farxiga is a non-addictive daily pill approved for long-term use across four serious conditions, with cardiovascular and kidney benefits beyond blood sugar control. It is not approved for weight loss, though modest weight loss can occur as a side effect.

Pros

  • Approved for diabetes, heart failure, and kidney disease

  • Safe for long-term daily use, not a controlled substance

  • Also approved for pediatric type 2 diabetes (ages 10+)

  • No abuse or withdrawal risk

Cons

  • Risk of genital yeast infections and UTIs

  • Rare but serious risk of Fournier's gangrene

  • Not approved for weight loss on its own

  • Roughly $400 to $785 per month without insurance

Phentermine

Phentermine works quickly to reduce appetite but is only approved for a few weeks of use, reflecting its stimulant effects and dependence risk. It has been prescribed for decades and remains one of the least expensive weight-loss medications available.

Pros

  • Fast-acting appetite suppression

  • Decades of clinical use and prescribing experience

  • Roughly $15 to $75 per month without insurance

  • Simple once-daily dosing

Cons

  • Approved for only a few weeks of use, not long-term

  • Schedule IV controlled substance with abuse potential

  • Can raise heart rate and blood pressure

  • Withdrawal effects possible after prolonged high doses

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