Key takeaways:
Januvia (sitagliptin) is an oral medication used to treat Type 2 diabetes in adults. It may be prescribed alone or with other diabetes medications.
The typical Januvia dosage is 100 mg by mouth once daily. Your dosage may be lower if you have kidney problems.
There are ways to save on Januvia. If you’re eligible, a manufacturer savings card can help you access brand-name Januvia for as little as $5. A patient assistance program is also available.
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If you’re living with Type 2 diabetes, there are a variety of oral medication options to help keep your blood glucose (sugar) in check. Januvia (sitagliptin) is one of them. It’s a dipeptidyl peptidase-4 (DPP-4) inhibitor. But some people refer to this group of medications as “gliptins.”
You may be prescribed Januvia on its own, or in combination with other diabetes medications. It’ll work best when combined with a diabetes-friendly diet and regular physical activity.
So, what’s the typical Januvia dosage? Below are the manufacturer’s recommended dosages. But it’s important to follow your prescriber’s instructions if you’re taking Januvia differently.
Good to know: Januvia isn’t FDA approved for use in children. So this article only reviews dosages for adults ages 18 and older.
What’s the typical Januvia dosage for adults?
Januvia is an oral medication that you take once a day. You can take it any time during the day, with or without food. But as with most medications, it’s best to be consistent and take it around the same time each day. Choose a time of day that fits best with your daily routine and try to stick with that.
For Type 2 diabetes, the typical Januvia starting dose is 100 mg by mouth once daily. Some diabetes medications start with a lower dosage, which may be increased based on response or side effects. But this isn’t the case with Januvia. Because it’s well-tolerated, most people take 100 mg daily from the beginning.
Januvia is available as 25 mg, 50 mg, and 100 mg tablets. The lower doses are generally used for people who have kidney problems — more on that below.
You can also find it in combination with another diabetes medication, metformin, as Janumet and Janumet XR. If you’re taking Januvia and metformin together, a combination pill may be a convenient option.
Are there any Januvia dosage adjustments for medical conditions?
You may need to take a lower dosage of Januvia if you have kidney disease. Your prescriber should check your kidney function before starting Januvia and periodically during treatment. Depending on how well your kidneys are working, your prescriber may adjust your dose as follows:
Mild kidney disease: Take 100 mg once daily. No dosage adjustments are needed.
Moderate kidney disease: Take 50 mg once daily.
Severe kidney disease: Take 25 mg once daily.
End-stage kidney disease or those receiving dialysis: Take 25 mg once daily.
Keep in mind that your prescriber will let you know if you should adjust your Januvia dosage. Don’t try to adjust it on your own.
Your prescriber might recommend a lower dose if you have kidney disease because your kidneys have a major role in clearing Januvia from your body. If your kidneys aren’t working well, Januvia may stay in your body longer or at higher levels than desired. This can increase the risk of side effects, such as headaches and hypoglycemia (low blood sugar).
Kidney damage is rare with Januvia. Though some people taking it have reported this side effect. If this happens, you may need to stop taking the medication. Since kidney damage is possible, it’s important to go for all recommended blood tests on time. This will help your prescriber watch for signs of kidney damage and know if you’re taking a safe Januvia dosage.
What happens if you miss a dose of Januvia?
If you accidentally forget a dose of Januvia, take it as soon as you remember. But if it’s almost time for your next dose, skip that one and take the next one that’s scheduled. You shouldn’t double up on doses.
If you find yourself missing doses frequently, talk to your prescriber or pharmacist. They may have some suggestions for remembering to take your medication.
What should you do if you take too much Januvia?
If you take too much Januvia, you may experience worse side effects such as an upset stomach or low blood sugar. At usual dosages, medications like Januvia are unlikely to cause low blood sugar. But there’s no guarantee if you take more than what’s recommended. And this risk can go up if you also take other diabetes medications.
To be on the safe side, watch for symptoms of low blood sugar such as shaking, nausea, or sweating. If you feel any of these, check your blood sugar. If your blood sugar drops below 70 mg/dL, be sure to follow the directions given to you on managing low blood sugar.
If you’re concerned that you have taken too much Januvia, contact your prescriber or Poison Control at 1-800-222-1222.
How to save on Januvia
There are ways to save on Januvia, which is available as a brand-name medication. GoodRx can help you navigate between copay savings cards and patient assistance programs to save money on your prescription.
Save with a copay savings card. If you have commercial insurance, you may be eligible to pay as little as $5 for Januvia using a savings card from the manufacturer.
Save with patient assistance programs. If you’re uninsured or underinsured, you may be eligible for Januvia’s patient assistance program, which offers the medication free of cost.
Frequently asked questions
For many people, 100 mg of Januvia is not a lot. In fact, this is the typical dosage for managing Type 2 diabetes. But you may take a lower dose of Januvia if you have kidney problems. Depending on your kidney function, you might take 25 mg or 50 mg once a day instead.
On average, Januvia can lower your hemoglobin A1C (HbA1c or A1C) by up to 0.8%. Your A1C represents your average blood sugar over 3 months. For some people, Januvia starts working in as little as 1 week but it can take anywhere from 3 to 6 months to see its full effects.
Januvia comes in three different doses: 25 mg, 50 mg, and 100 mg tablets. The typical dose of Januvia for most people living with Type 2 diabetes is 100 mg once daily. The 25 mg and 50 mg tablets are usually prescribed for people who have kidney issues.
For many people, 100 mg of Januvia is not a lot. In fact, this is the typical dosage for managing Type 2 diabetes. But you may take a lower dose of Januvia if you have kidney problems. Depending on your kidney function, you might take 25 mg or 50 mg once a day instead.
On average, Januvia can lower your hemoglobin A1C (HbA1c or A1C) by up to 0.8%. Your A1C represents your average blood sugar over 3 months. For some people, Januvia starts working in as little as 1 week but it can take anywhere from 3 to 6 months to see its full effects.
Januvia comes in three different doses: 25 mg, 50 mg, and 100 mg tablets. The typical dose of Januvia for most people living with Type 2 diabetes is 100 mg once daily. The 25 mg and 50 mg tablets are usually prescribed for people who have kidney issues.
The bottom line
Januvia (sitagliptin) is an oral medication taken once a day to treat Type 2 diabetes in adults. For most people, the typical Januvia dosage is 100 mg by mouth once daily. If you have kidney problems, your dosage may be lower. Januvia is well tolerated and may be combined with other medications to manage your blood glucose (sugar) levels.
If you have questions about how you should take Januvia, talk to your prescriber or pharmacist.
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References
MedlinePlus. (2025). Sitagliptin.
Zydus Lifesciences Limited. (2025). Sitagliptin- sitagliptin tablet [package insert].
