Januvia (sitagliptin) is taken as one tablet by mouth, once a day, with or without food. The standard dose is 100 mg, though your prescriber may lower it to 50 mg or 25 mg if you have reduced kidney function. You can take it at any time of day, and there’s no need to coordinate it around meals.
Standard Dose and Available Strengths
Januvia comes in three tablet strengths: 100 mg, 50 mg, and 25 mg. Most adults with type 2 diabetes take the 100 mg tablet once daily. The lower strengths exist specifically for people whose kidneys don’t filter as efficiently, since the body clears sitagliptin primarily through the kidneys.
Timing and Food
There’s no best time of day to take Januvia. Morning, evening, or midday all work equally well. The key is consistency: pick a time that fits your routine and stick with it so you’re less likely to forget. Unlike some diabetes medications, Januvia doesn’t need to be taken with food and won’t cause stomach upset on an empty stomach.
What to Do If You Miss a Dose
If you forget a dose, take it as soon as you remember. If you don’t remember until it’s nearly time for your next scheduled dose, skip the missed one and return to your regular schedule. Never double up to make up for a missed tablet.
Dose Adjustments for Kidney Function
Your kidney function, measured by a blood test called eGFR, determines whether you need a lower dose. Here’s how it breaks down:
- eGFR 45 or above: Standard 100 mg dose, no adjustment needed.
- eGFR 30 to 44: Reduced dose of 50 mg once daily.
- eGFR below 30 (including dialysis): Reduced dose of 25 mg once daily.
Your prescriber will check your kidney function before starting Januvia and periodically afterward. If your kidney numbers change over time, your dose may be adjusted accordingly.
How Januvia Works
Januvia belongs to a class of medications called DPP-4 inhibitors. It works by blocking an enzyme that normally breaks down hormones your gut releases after eating. These hormones signal your pancreas to produce more insulin when blood sugar rises and tell your liver to ease up on releasing stored sugar. By keeping those hormones active longer, Januvia helps your body regulate blood sugar more effectively after meals. On its own, it typically lowers A1C by a modest but meaningful amount, and it’s often prescribed alongside metformin or other diabetes medications for a larger combined effect.
Common Side Effects
Januvia is generally well tolerated. The most frequently reported side effects in clinical trials were mild and resembled cold symptoms. In studies of people taking 100 mg daily, about 5 to 6% experienced nasopharyngitis (a stuffy or sore throat), upper respiratory infections, or headaches. These rates were only slightly higher than in people taking a placebo, which means some of those symptoms may not have been caused by the medication at all.
Low Blood Sugar Risk With Other Medications
Januvia by itself carries a low risk of hypoglycemia (low blood sugar). That changes when you combine it with insulin or sulfonylureas, which are medications that actively push blood sugar down. In clinical trials, 15.5% of people taking Januvia alongside insulin experienced at least one episode of low blood sugar, compared to 7.8% on insulin with a placebo. Severe episodes requiring medical help were rare, occurring in less than 1% of patients.
If you take Januvia with insulin or a sulfonylurea, your prescriber may lower the dose of those other medications to reduce your hypoglycemia risk. Know the symptoms of low blood sugar: shakiness, sweating, confusion, rapid heartbeat, and hunger. Keep a fast-acting sugar source like glucose tablets or juice on hand.
Pancreatitis Warning
Rare cases of acute pancreatitis have been reported in people taking Januvia. The hallmark symptom is persistent, severe abdominal pain that may come with nausea, vomiting, and loss of appetite. This pain typically doesn’t go away on its own and feels different from ordinary stomach discomfort. If you experience this, stop taking the medication and seek medical attention promptly. People with a history of pancreatitis should be monitored more closely while on this medication.
Storage
Store Januvia at room temperature, ideally between 68°F and 77°F (20°C to 25°C). Brief exposure to temperatures between 59°F and 86°F is acceptable, but avoid leaving the bottle in a hot car or a humid bathroom for extended periods.