Key takeaways:
Januvia (sitagliptin) is a prescription medication that manages blood glucose (blood sugar) levels in adults with Type 2 diabetes. Januvia works by indirectly raising levels of natural gut hormones that balance blood sugar.
Januvia is an oral medication that you take by mouth once daily. You can take it any time of day. But it’s important to be consistent about when you take it.
There are ways to save on Januvia. If you’re eligible, a manufacturer savings card can help you access Januvia for as little as $5 per month. A patient assistance program is also available.
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If you or a loved one is living with diabetes, you may have heard of Januvia (sitagliptin). Januvia is a prescription medication used to manage blood glucose (blood sugar) levels in adults with Type 2 diabetes. It’s typically prescribed if other medications, such as metformin, aren’t working well enough.
If you’re wondering how Januvia works or if there are ways to help it work better, you’re in the right place. These pharmacist-backed tips for taking Januvia can help you get the most out of your medication.
How does Januvia work?
Januvia belongs to a group of medications called dipeptidyl peptidase-4 (DPP-4) inhibitors, or “gliptins” for short. It works by blocking the DPP-4 enzyme (protein) in your body. This protein breaks down incretins (gut hormones) in your body.
Examples of incretins that DPP-4 breaks down include:
Glucagon-like peptide-1 (GLP-1)
Glucose-dependent insulinotropic polypeptide (GIP)
By blocking DPP-4, Januvia helps raise levels of GLP-1 and GIP in your body, helping to regulate blood sugar. Among other effects, these incretins enhance insulin release and reduce the amount of new sugar your body makes.
Knowing how Januvia works is important. But there are also ways you can help give it the best chance to work well. Below are five pharmacist-backed tips for taking Januvia.
Tip #1: Take Januvia any time of day, as long as you’re consistent
It can be overwhelming to try fitting medications into your daily routine. Thankfully, Januvia can conveniently be taken any time of day. One time of day isn’t better than another. But it’s best to be consistent with the time you take it.
Finding a way to naturally incorporate Januvia into your lifestyle is your best bet. If it’s easier to take Januvia at breakfast time, you can set a reminder to take it with your morning meal. Or, if you have a more consistent nightly routine, you could incorporate it into your bedtime prep. This way, you’ll remember to take it around the same time each day.
If you have a smartphone, medication reminder apps can also help you remember to take your medications. Pill organizers are also handy if you coordinate multiple medications.
Tip #2: Take Januvia with or without food
You can take Januvia with or without food — whichever you prefer. Either way, it won’t change how well Januvia works. But taking your medication with the same meal every day can help you remember to take it.
Tip #3: Know how long it takes for Januvia to start working
Medications work differently in everyone’s bodies. But it may take about 3 to 6 months for Januvia to cause noticeable changes to your blood sugar levels. On average, Januvia can help reduce hemoglobin A1C (HbA1c or A1C) by about 0.7% after 6 months. Your A1C represents your average blood sugar levels over the past 3 months.
While you’re taking Januvia, your prescriber will likely monitor your A1C from time to time. This will help them determine if the medication is working and if you’re taking the best dose for you. Your prescriber may also ask you to check your blood sugar at home.
Tip #4: Check with your pharmacist and prescriber about Januvia interactions
In general, you don’t need to separate Januvia from other medications throughout the day. It interacts with very few medications. But its blood sugar-lowering effects are sometimes enhanced too much by other medications.
Januvia is unlikely to cause hypoglycemia (low blood sugar) on its own. But if you take Januvia along with certain diabetes medications — such as insulin or a sulfonylurea — there’s a higher risk of experiencing hypoglycemia. If you’re taking Januvia and one of these medications, discuss how to monitor for and quickly treat low blood sugar with your prescriber.
You should also be cautious if you’re taking Januvia and oral semaglutide (Rybelsus, Ozempic pills, Wegovy pills). It’s tough for your body to absorb oral semaglutide. So if you’re taking it, there are specific instructions to follow to ensure you get your full dose. These include taking it on an empty stomach and separating it from other oral medications, such as Januvia, by at least 30 minutes.
To avoid interaction risks, it’s best to keep an updated list of all over-the-counter (OTC) and prescription medications, as well as any supplements, that you take. Your pharmacist and prescriber can check this list to see if Januvia interacts with anything.
Tip #5: Discuss possible Januvia side effects with your prescriber and pharmacist
Januvia is generally well-tolerated. But like all medications, Januvia can cause side effects you should be aware of.
Common or mild Januvia side effects include:
Upper respiratory tract infections, such as the common cold
Headache
Joint pain
Diarrhea
Although rare, Januvia also has reports of potentially serious risks and side effects. These include:
Pancreatitis (swelling of the pancreas)
New or worsening heart failure
Severe joint pain
Bullous pemphigoid, a skin condition that causes large blisters
Severe skin reactions
Allergic reactions
If you experience any serious side effects, reach out to your prescriber as soon as possible. But if your symptoms feel severe, it’s better to seek emergency medical care right away.
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 per month 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.
Good to know: There is a generic version of sitagliptin available. This may have a lower cost for some people. But generic sitagliptin is not interchangeable with Januvia. Discuss whether this option is appropriate for you with your prescriber.
Frequently asked questions
There’s nothing that you have to avoid while taking Januvia. But combining it with certain diabetes medications, such as insulin, may raise your risk of low blood sugar. And you should wait at least 30 minutes after taking oral semaglutide to take Januvia (or other oral medications).
You may also want to limit or avoid foods and beverages that can cause spikes or drops in blood sugar. Examples of foods to limit while taking Januvia include starchy vegetables, sugary drinks, and alcohol.
Not usually. Januvia is considered a “weight-neutral” diabetes medication. It doesn’t usually cause significant weight loss or gain.
If needed, you can stop Januvia cold turkey. It doesn’t cause withdrawal symptoms. But talk to your prescriber before making changes to your medication regimen. If you stop taking Januvia without a plan in place, your blood sugar levels will likely start to go back up.
There’s nothing that you have to avoid while taking Januvia. But combining it with certain diabetes medications, such as insulin, may raise your risk of low blood sugar. And you should wait at least 30 minutes after taking oral semaglutide to take Januvia (or other oral medications).
You may also want to limit or avoid foods and beverages that can cause spikes or drops in blood sugar. Examples of foods to limit while taking Januvia include starchy vegetables, sugary drinks, and alcohol.
Not usually. Januvia is considered a “weight-neutral” diabetes medication. It doesn’t usually cause significant weight loss or gain.
If needed, you can stop Januvia cold turkey. It doesn’t cause withdrawal symptoms. But talk to your prescriber before making changes to your medication regimen. If you stop taking Januvia without a plan in place, your blood sugar levels will likely start to go back up.
The bottom line
Januvia (sitagliptin) is a prescription medication for adults living with Type 2 diabetes. It works by indirectly raising levels of natural gut hormones that regulate blood glucose (blood sugar). Januvia is generally well-tolerated, but it’s best to be consistent with the time of day you take it. It doesn’t matter if you prefer to take it in the morning or at night.
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References
Dallumal, R. M., et al. (2015). Sitagliptin: Is it effective in routine clinical practice? International Journal of Endocrinology.
Feingold, K. R. (2025). Oral and injectable (non-insulin) pharmacological agents for the treatment of Type 2 diabetes. Endotext.
Kasina, S. V. S. K., et al. (2023). Dipeptidyl peptidase IV (DPP IV) inhibitors. StatPearls.
Merck Sharp & Dohme. (2023). Januvia- sitagliptin tablet, film coated [package insert].
Zydus Pharmaceuticals (USA). (2025). Sitagliptin- sitagliptin tablet [package insert].
