Compare metformin vs. Humalog

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Glucophage (metformin)

Prescription only

Humalog (insulin lispro)

Prescription only
Lowers blood sugar.

Glucophage (metformin) is the first choice medicine to control your blood sugar and lower the risk of death from diabetes, although a few people may not tolerate the stomach side effects.

3.7/ 5 average rating with 938 reviewsformetformin
Lowers blood sugar.

Humalog (insulin lispro) is a fast-acting insulin that controls blood sugar around meal times.

3.7/ 5 average rating with 280 reviewsforHumalog
Upsides
  • Improves sugar control and lowers A1c levels as much as 2%.
  • One of the few diabetes medicines that lowers the risk of death from diabetes-related complications.
  • Doesn't cause weight gain.
  • Rarely causes low blood sugar.
  • Humalog (insulin lispro) is the most effective medication for lowering your blood sugar.
  • Works quickly to control your sugar levels after meals.
  • Dose can be easily adjusted to create a regimen that's tailored to your body's needs.
  • Humalog (insulin lispro) can be used even if you have liver or kidney problems, unlike other anti-diabetic medications.
Downsides
  • Often causes stomach upset, like diarrhea, nausea, gas, or stomach cramping.
  • Usually not a good choice for people with kidney problems. Your doctor will tell you if Glucophage (metformin) is right for you to take.
  • Excessive or chronic alcohol use can increase the risk of a dangerous side effect.
  • You have to take Humalog (insulin lispro) by injection.
  • Humalog (insulin lispro) is likely to cause moderate weight gain (around 4 to 6 pounds).
  • There is a higher risk for episodes of low blood sugar compared to other anti-diabetic medications.
  • Effects do not last long enough to control your blood sugar for a whole day.
Used for
Dosage forms
  • Pill
  • Extended release pill
  • Liquid
  • Injection
Price
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Reviews
938 reviews so far
65%
saidit'sworth it
46%
saiditworked well
16%
saidit'sa big hassle

Have you used Glucophage (metformin)?

Leave a review
280 reviews so far
64%
saidit'sworth it
50%
saiditworked well
16%
saidit'sa big hassle

Have you used Humalog (insulin lispro)?

Leave a review
Side effects
7possible side effects
  • Diarrhea
    53%
  • Nausea/vomiting
    26%
  • Gas
    12%
  • Weakness
    9%
  • Indigestion
    7%
  • Stomach pain
    6%
  • Headache
    6%
See more detailed side effects
The Humalog (insulin lispro) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Excess lactic acid in the blood
    • Kidney problems
    • Liver problems
    • Congestive heart failure
    • Using contrast dye for procedures
    • Surgery
    • Alcohol use
  • Low vitamin B12 levels
See more detailed risks and warnings
  • Life-threatening low blood sugar (hypoglycemia)
    • Insulin dose too high
    • Use of other blood sugar lowering medications
    • Poor injection techniques
  • Complications due to low potassium
    • Use of medications that lower potassium
    • Current electrolyte imbalance
  • Severe allergic reactions
    • Allergy to insulin
See more detailed risks and warnings
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Disclaimer: We don't provide medical advice. If you think you might have a medical emergency, call your doctor or 911 immediately.