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Janumet (Metformin & Sitagliptin)
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Janumet (Sitagliptin and Metformin HCl) Medication Overview
Janumet is a prescription dipeptidyl peptidase-4 inhibitor medication combined with biguanide that is used for the treatment of patients with type 2 diabetes. It is used to help those patients get better glycemic control. This medication is meant to be used alongside healthy dietary changes and exercise routines.

Why Choose Janumet?
- Uses Combination of Two Other Proven Medications
- May be More Effective Than Using Metformin Alone
- Taken Orally
- Helps Body Use Insulin Effectively
- Lowers High Blood Sugar Levels
- Trusted Manufacturer (Merck Sharp & Dohme Corp.)

Dosage & How to Use Janumet
This medication is designed to be taken orally twice per day. Each tablet should be consumed with a meal. Different patients may be prescribed different doses based on their tolerability and how the medication is affecting them. However, the maximum daily intake is limited to 100 mg of sitagliptin and 2000 mg of metformin HCl. Patients who have not taken metformin before are usually recommended to start with a dose of 50 mg/500 mg twice per day. This dose is then usually escalated gradually. The usual starting dose is 50 mg sitagliptin twice daily (100 mg total per day) along with their current metformin dose for patients already taking metformin. Those taking 850 mg of metformin two times a day generally begin Janumet at 50 mg/1000 mg twice daily.
Never split or divide these tablets. The patient should take the missed dose as soon as possible if a dose of Janumet is missed in most cases. However, the missed dose should be skipped and the regular schedule resumed if it is almost time for the next dose.

Precautions & Warnings (Safety Information)
This medication has a black boxed warning for lactic acidosis. This risk is associated with the metformin in the medication. This condition can sometimes be fatal and is often indicated by signs such as muscle aches and nausea/vomiting. Advanced stages of this condition can lead to low blood pressure or temperature, along with delirium or difficulty maintaining balance. Patients suffering from this are considered to be having a medical emergency and should immediately go to the hospital to seek medical attention. Do not use Janumet if you have severe kidney or liver disease. The presence of these conditions increases the chance of lactic acidosis.
Patients should stop using this medication and contact their doctor immediately if they experience symptoms that may indicate lactic acidosis, such as:
- Feeling unusually cold in the hands or feet
- Dizziness or lightheadedness
- Slow or irregular heartbeat
- Extreme tiredness or weakness
- Unexplained muscle pain
- Difficulty breathing
- Unusual sleepiness or confusion
- Stomach pain
- Nausea/vomiting
The risk of developing this condition is higher for patients with severe kidney issues or those who have had their kidneys affected by X-ray tests that use injectable dyes. The risk is also greater for patients with liver or heart problems. This includes issues like stroke/heart attack and severe infections. Those aged 65 or older also have an increased risk of developing lactic acidosis. The same goes for patients who are drinking alcohol or are dehydrated. Surgery may also increase the risk.
Other Precautions and Warnings
Pancreatitis and heart failure may also be triggered by the use of this medication in some rare instances. This is why patients should let their doctor know ahead of time if they have a history of gallstones or pancreatitis. They should also let them know if they have a history of alcoholism or high blood triglyceride levels. A history of heart failure and kidney or liver problems should also be reported before starting the medication.
A doctor should be contacted right away if the patient begins experiencing difficulty breathing (especially when lying down) or swelling (especially in the limbs). Unusual tiredness and weight increases should also be reported right away.
It is not known how this medication affects unborn babies in pregnant mothers taking the medication or those who are breastfeeding. This medication should not be started without consulting a doctor if the patient is pregnant, intending to become pregnant, or breastfeeding. Notify your healthcare provider immediately if pregnancy occurs during treatment with this medication. This medication may cause ovulation in some women who have not yet gone through menopause. Patients should also tell their doctor if they have low vitamin B12 in their blood.
Let your doctor know of the history of any conditions you may have had before starting this medication to make sure it is safe to use. The same goes for any other medications or supplements being taken at the time.

Side Effects of Janumet
Common side effects of Janumet may include:
- Headache
- Stuffy or runny nose/sore throat or mild respiratory symptoms
- Upset stomach
- Gas/indigestion
- Diarrhea
- Nausea/vomiting
- Feeling tired or weak
- Low blood sugar (especially when taken with insulin or sulfonylurea medications)
Contact a healthcare provider if any of these side effects become severe or persistent.
Serious Side Effects
Serious side effects may also take place on more rare occasions. These include side effects like kidney problems or vitamin B12 deficiency (especially when this medication has been used for a long time). Other rare but possible serious side effects include hypoglycemia and joint pain. Skin reactions or serious allergic reactions may also occur in some cases. Anyone experiencing serious side effects should get medical help immediately.

Drug Interactions
There have been some drug interactions that have been found to be clinically significant with Janumet. These include:
- Carbonic anhydrase inhibitors (these may increase the risk of lactic acidosis)
- Drugs that reduce metformin clearance
- Alcohol (these can increase metformin’s effect on lactate metabolism and raise the risk of lactic acidosis)
- Iznsulin or insulin secretagogues (e.g., sulfonylureas)
- Drugs affecting blood sugar control (these may reduce Janumet’s effectiveness)
Always consult a medical professional first before combining any medications or other supplements.
Storage and Handling Tips For Janumet
The tablets should be stored at room temperature—within a temperature range of 68°F to 77°F. This is the equivalent of 20°C to 25°C. They should also be kept out of reach from children and away from moisture and direct light. This medication should be left in its original container until use. MyRx Outlet safely and compliantly packs and ships all medications directly to patients’ homes in the U.S.

Janumet Drug Facts
| Category | Details |
| Brand Name | Janumet |
| Generic Name | Metformin & Sitagliptin |
| Drug Class | DPP-4 inhibitor and biguanide |
| Indication | Antidiabetic medication used to help type 2 diabetes patients with blood sugar control |
| Mechanism of Action | Targets the body’s incretin system and suppresses glucose production to help with blood sugar control |
| Dosage Forms | Tablets |
| Available Strengths |
|
| Usual Adult Dose | 1 tablet twice daily with meals (strengths may vary) |
| Route of Administration | Orally (by mouth) |
| Half-Life |
|
| Metabolism |
|
| Onset of Action |
|
| Pregnancy & Lactation | Not Recommended Due to Risks to Infant or Fetus |
| Storage Practices | Store at room temperature (68°F-77°F/20°C-25°C) in original container with cap tightly closed |
| Manufacturer | Merck Sharp & Dohme Corp. |
| Prescription Status | Prescription required |

Frequently Asked Questions (FAQ)
What is Janumet?
Janumet is a prescription medication that combines two proven diabetes treatments—sitagliptin and metformin. It helps patients with type 2 diabetes manage their blood sugar levels more effectively.
When will generic Janumet be available?
The earliest the generic version of this medication may be seen in the U.S. is May 2026. This is when the patent is set to expire.
How long does it take for the body to clear Janumet?
The half-life of sitagliptin is usually about 12.4 hours. Meformin—the other component of this medication—has a half-life is around 17.6 hours. This means it can be several days before the medication fully makes it out of the patient’s system.
How does Janumet work?
The medication works in two ways. Sitagliptin helps the body release insulin when blood sugar is high and reduces the amount of sugar produced by the liver. Metformin improves how the body responds to insulin and decreases glucose production in the liver. The combination of these two medications causes more effective blood sugar control than the medications alone.
When will the effects of Janumet be noticeable?
Some patients may notice changes in blood sugar within four to five days. Consistent use over several weeks is typically needed to see changes in HbA1c.
Who makes Janumet?
Janumet is manufactured by Merck Sharp & Dohme Corp. The same pharmaceutical company makes other medications like Januvia and Keytruda.
How long does it take for side effects from Janumet to go away?
Most mild common side effects should go away on their own as the patient’s body gets more used to the medication. The duration may be anywhere between a few days and a few weeks. Serious side effects or side effects that worsen or do not go away should immediately be reported to a medical professional.
How to take Janumet?
This medication should be taken orally twice a day with meals. These tablets should never be split or crushed.
Is Janumet the same as metformin?
Metformin is one component of Janumet. However, it also contains sitagliptin. This combination can be more effective than metformin alone for some patients.
What is better, Janumet or Ozempic?
Both medications treat type 2 diabetes but work differently. Janumet is an oral medication that combines sitagliptin and metformin. Ozempic is a GLP-1 receptor agonist injectable medication. The more effective or suitable medication depends on the circumstances of the specific patient it is being used for.
How much does a month’s supply of Janumet typically cost?
A month’s supply of this medication often costs over $500 per month in the U.S. for patients without insurance. Patients may be able to find this medication for much more affordable prices when they order through Canadian prescription fulfillment services like MyRx Outlet.
Does Medicare pay for Janumet?
Yes. This medication is usually covered by Medicare. Copays may vary.
What to avoid when taking Janumet?
Patients should limit alcohol intake while on this medication. They should also avoid supplements that affect blood sugar without their doctor’s guidance and other medications/supplements that may interact with the medication. They should also inform their doctor before having any X-ray tests with contrast dyes (they may need to stop the medication temporarily surrounding the time of the test).
Our Guarantee For Buying Janumet From A Canadian Pharmacy Partner
At MyRx Outlet, we are committed to delivering safe, high-quality medications that you can trust. We adhere to strict regulations in every country we operate in, ensuring that your order is handled by a licensed Canadian pharmacy or a trusted partner overseas. Each medication has been legally approved by Health Canada or other respected authorities. To purchase Janumet at a discounted rate, call 1-888-551-2467.
IMPORTANT NOTE: The information provided here is for educational purposes only and is not intended to serve as medical advice, diagnosis, or treatment recommendations. It should not be taken as an endorsement of any specific medication or treatment. Individual health conditions and responses to treatment can vary greatly; therefore, this information should not be seen as a guarantee of safety, suitability, or effectiveness for any particular individual. Always consult with a healthcare professional for personalized medical advice and before making any decisions regarding your health or treatment plans.
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Llamas, H. (2025, October 24). Januvia & Janumet. Drug Watch. https://www.drugwatch.com/januvia/
Ozempic® (semaglutide) injection for Type 2 Diabetes. (n.d.). Ozempic® https://www.ozempic.com/
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St Onge, E. L., Miller, S., & Clements, E. (2012, December 1). Sitagliptin/Metformin (Janumet) as Combination Therapy In the Treatment of Type-2 Diabetes Mellitus. National Library of Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC3541863/
The Benefits of Janumet. (2024, July 5). Advocate My Meds. https://advocatemymeds.com/the-benefits-of-janumet/
U.S. District Court Rules In Favor of Merck in Sitagliptin Phosphate Patent Lawsuit. (2022, September 22). Merck.com. https://www.merck.com/news/u-s-district-court-rules-in-favor-of-merck-in-sitagliptin-phosphate-patent-lawsuit/
Watson, A. (2022, April 3). Janumet and Janumet XR side effects: What you should know. https://www.medicalnewstoday.com/articles/drugs-janumet-side-effects