Compare Lantus vs. Janumet

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

Lantus
(insulin glargine)

Janumet
(sitagliptin / metformin)

Lowers blood sugar. Lantus (Insulin Glargine) is a long-acting insulin that provides all-day sugar control. It can cause low blood sugar, so make sure you know what the symptoms are and always have a source of sugar nearby.Lowers your blood sugar. Janumet is a combination of two anti-diabetic medicines that work better together, but is available as brand only.
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Coupons for Lantus
Best available price for 15 (5 solostar pens of 3ml) cartons of lantus
Coupons for Janumet
Best available price for 60 (50mg/1000mg) tablets of janumet
Reviews & ratings
Filter group. All currently selected
Filter group. All currently selected
5.08Lantus
Reviews for Lantus
67%
of people (All ages) say Lantus is worth it
51%
say it works well
14%
say it's a big hassle
584 reviews
Have you used Lantus (insulin glargine)?
Worth itNot sureNot worth it
Reviews for Janumet
46%
+21% better vs. Lantus
38%
+13% better vs. Lantus
15%
+1% better vs. Lantus
Have you used Janumet (sitagliptin / metformin)?
Worth itNot sureNot worth it
Side effects
LantusJanumet
  • Ear, nose, or throat infection 22%
  • Infection 9%
  • Accidental injury 6%
  • Headache 6%
  • Ankle and leg swelling 20%
  • High blood pressure 20%
  • Sinus inflammation 19%
  • Flu 19%
  • Clouded eye lens 18%
  • Bronchitis 15%
More Lantus side effects »
  • Low blood sugar 15%
  • Diarrhea 4%
  • Ear, nose, or throat infection 1%
  • Headache 3%
More Janumet side effects »
How it works
LantusJanumet
Lantus (Insulin Glargine) is a long-acting insulin medicine for diabetes. It acts like the insulin that your body normally makes to process sugars and fats, and it keeps your blood sugar stable throughout the day.Janumet (sitagliptin / metformin) is a combination of two anti-diabetic medicines. Metformin lowers the amount of sugar your body produces, and sitagliptin enhances the release of insulin.
Type of medication
LantusJanumet
Prescription onlyPrescription only
Available as
LantusJanumet
  • Injection
  • Pill
  • Extended release
Used for
LantusJanumet
Risk factors for serious side effects
LantusJanumet
  • Insulin dose too high
  • Use of other blood sugar lowering medicines
  • Poor injection techniques
  • Unstable kidney functions
  • Unstable liver functions
Detailed Lantus (insulin glargine) risks & warnings »
  • Kidney problems
  • Liver problems
  • Congestive heart failure
  • Using contrast dye for procedures
  • Surgery
Detailed Janumet (sitagliptin / metformin) risks & warnings »
Pregnancy

Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

Food
LantusJanumet
No food related info.
  • Take with food to avoid upset stomach with diarrhea, nausea, and vomiting.
Kidneys and liver
LantusJanumet
  • Okay to use even if you have liver or kidney problems, unlike most other blood sugar-lowering medicines.
  • Not appropriate for those with poor kidney function.
Weight
LantusJanumet
  • Can cause weight gain and low blood sugar.
  • Likely to cause moderate weight gain (around 4 to 6 pounds).
No weight related info.
Upsides and benefits
LantusJanumet
  • Insulin is the most effective blood sugar-lowering medicine. When used correctly, it'll lower blood sugar every time you use it and prevent the harmful effects of high sugar levels on your organs and blood vessels.
  • Lantus is a long-lasting insulin that provides consistent, all-day sugar control with less risk of low blood sugar.
  • Dose can be easily adjusted to make a customized regimen that's tailored to your body.
  • Starting insulin early in the treatment of Type 2 diabetes can maintain your body's insulin-producing cells and slow down disease progression.
  • Okay to use even if you have liver or kidney problems, unlike most other blood sugar-lowering medicines.
  • This 2-in-1 combination can lower the number of pills you have to take daily.
  • Lowers A1c (average blood sugar over time) up to 2.5%.
  • Available in extended and immediate release forms to allow better control of your blood sugar.
  • Doesn't increase your appetite unlike other anti-diabetic medicines.
  • Does not cause hypoglycemia or very low blood sugar.
Downsides and risks
LantusJanumet
  • You have to take insulin by injection.
  • You have to check your blood sugar every day.
  • Likely to cause moderate weight gain (around 4 to 6 pounds).
  • Higher risk of low blood sugar episodes than other kinds of diabetes medicines.
  • Available as brand name only and may be expensive.
  • Metformin component usually causes upset stomach.
  • Sitagliptin component may increase your risk for throat infections and inflammation of pancreas.
  • Not appropriate for those with poor kidney function.
Tips from our pharmacists for people taking the medication
LantusJanumet
  • Long-acting insulin good for baseline blood sugar control.
  • Works in 1 hour and lasts about 24 hours.
  • Can cause weight gain and low blood sugar.
  • Make sure you and your family know the symptoms of low blood sugar: sweating, shakiness, weakness, fast heartbeat, nervousness, headache, blurry vision, trouble thinking clearly, or passing out.
  • Always have a good source of sugar nearby for low blood sugar episodes.
  • Take it at the same time every day.
  • Make sure you understand how to give yourself the injections.
  • Don't shake the vial or mix with another insulin. Store unopened vials in the refrigerator. Opened vials are good at room temperature for 28 days.
  • Check your blood sugar levels every day.
  • Take with food to avoid upset stomach with diarrhea, nausea, and vomiting.
  • May cause headaches and cold-like symptoms.
  • Tell your doctor about any deep or rapid breathing, or persistent nausea, vomiting, and stomach pain.
  • Can be expensive depending on insurance coverage.
  • Check your blood sugar regularly.
Learn more
More about LantusSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Lantus (insulin glargine)?
Worth itNot sureNot worth it
More about JanumetSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Janumet (sitagliptin / metformin)?
Worth itNot sureNot worth it