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oral tablet (prescription)a DPP-4 inhibitor, a type of medicine used to lower blood sugar in adults with type 2 diabetes

Sitagliptin

SITAGLIPTIN PHOSPHATE · Say it: sit-a-GLIP-tin

Sitagliptin is a prescription tablet taken once a day, along with diet and exercise, to help lower blood sugar in adults with type 2 diabetes.

Brand names: JANUVIA

Reading levelLanguage

Used for

The label says sitagliptin is used along with diet and exercise to improve blood sugar control in adults with type 2 diabetes. The label says it should not be used in people with type 1 diabetes. It has not been studied in people with a history of pancreatitis, so the label cannot say whether those people have a higher risk of pancreatitis while taking it.

Comes as

Film-coated tablets in three strengths: 25 mg (pink, engraved S25), 50 mg (light beige, engraved S50), and 100 mg (beige, engraved S100); Supplied in bottles of 30 or 90 tablets, depending on strength

Common side effects

Upper respiratory tract infection (an infection of the nose, throat, or airways), Nasopharyngitis (a common cold-type infection of the nose and throat), Headache

Key facts
Generic nameSITAGLIPTIN PHOSPHATE
Brand namesJANUVIA
Type of medicinea DPP-4 inhibitor, a type of medicine used to lower blood sugar in adults with type 2 diabetes
How it is soldoral tablet (prescription)
Comes asFilm-coated tablets in three strengths: 25 mg (pink, engraved S25), 50 mg (light beige, engraved S50), and 100 mg (beige, engraved S100); Supplied in bottles of 30 or 90 tablets, depending on strength
Routeoral
Boxed warningNo
Label date2026-08-12

💊 What is Sitagliptin used for?

  • The label says sitagliptin is used along with diet and exercise to improve blood sugar control in adults with type 2 diabetes. The label says it should not be used in people with type 1 diabetes. It has not been studied in people with a history of pancreatitis, so the label cannot say whether those people have a higher risk of pancreatitis while taking it.

How it works

The label describes sitagliptin as an inhibitor of an enzyme called dipeptidyl peptidase-4 (DPP-4). It is part of a group of medicines called DPP-4 inhibitors. The label does not explain this in more detail.

How it is usually taken

  • The label says to take one tablet once a day, exactly as your doctor tells you. It can be taken with or without food. Your doctor may do blood tests to check how well your kidneys are working, before and during treatment. Your doctor may also ask you to check your blood sugar and have regular blood tests, including a hemoglobin A1C test. The label says to stay on your prescribed diet and exercise plan. If you miss a dose, the label says to take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not take two doses at the same time.

Comes as

  • Film-coated tablets in three strengths: 25 mg (pink, engraved S25), 50 mg (light beige, engraved S50), and 100 mg (beige, engraved S100)
  • Supplied in bottles of 30 or 90 tablets, depending on strength

⚠️ Sitagliptin side effects

Common side effects

  • Upper respiratory tract infection (an infection of the nose, throat, or airways)
  • Nasopharyngitis (a common cold-type infection of the nose and throat)
  • Headache
  • Low blood sugar (hypoglycemia), which the label says was more common when sitagliptin was taken with a sulfonylurea or insulin

Get medical help right away if

  • Get medical help right away if you have severe stomach (abdomen) pain that will not go away. The pain may spread from your abdomen to your back, and it may happen with or without vomiting. These can be signs of pancreatitis, and the label says to stop taking sitagliptin and call your doctor right away.
  • Get medical help right away if you have increasing shortness of breath or trouble breathing, especially when lying down; swelling or fluid retention in the feet, ankles, or legs; an unusually fast increase in weight; or unusual tiredness. These can be signs of heart failure.
  • Get medical help right away if you have signs of kidney problems. The label says kidney problems, sometimes requiring dialysis, have been reported.
  • Get medical help right away if you have signs of low blood sugar. The risk is higher if you take sitagliptin with a sulfonylurea or insulin.
  • Get medical help right away if you have a serious allergic reaction, such as rash, raised red patches on the skin (hives), or swelling of the face, lips, tongue, and throat that may cause trouble breathing or swallowing. The label also reports serious skin reactions, including Stevens-Johnson syndrome.
  • Tell your doctor right away if you have blisters or sores on your skin. The label says bullous pemphigoid has been reported in people taking DPP-4 inhibitors and may require hospital care.
  • Tell your doctor if you have severe joint pain. The label says severe and disabling joint pain (arthralgia) has been reported with DPP-4 inhibitors, and the medicine may need to be stopped if appropriate.

🛑 Who should not take Sitagliptin, and who should be careful

The label says not to take it if

  • You have had a serious allergic reaction to sitagliptin in the past, such as anaphylaxis or angioedema.
  • You are allergic to any ingredient in the tablet. The label says to see the Medication Guide for the full list of ingredients.
  • You have type 1 diabetes. The label says sitagliptin should not be used in this condition.

Tell your doctor before taking it if

  • Tell your doctor if you have ever had pancreatitis, high blood triglyceride levels, gallstones, kidney problems, heart failure, or a history of alcoholism.
  • Tell your doctor about all of your medical conditions and all medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.
  • Tell your doctor if you are pregnant, plan to become pregnant, are breastfeeding, or plan to breastfeed.
  • The label says the safety and effectiveness have not been established in pediatric patients.
  • The label says your doctor will check your kidney function with blood tests before and during treatment.

🔀 Sitagliptin with other medicines, food and alcohol

The label says to discuss these with your doctor or pharmacist

  • Taking sitagliptin with an insulin secretagogue (such as a sulfonylurea) or with insulin can raise the risk of low blood sugar. The label says the dose of the sulfonylurea or insulin may need to be lowered.
  • Tell your doctor and pharmacist about every medicine you take, including over-the-counter medicines, vitamins, and herbal supplements.

Alcohol and food

The label says sitagliptin can be taken with or without food. The label lists a history of alcoholism as a condition to tell your doctor about before starting, because it is linked to a higher chance of pancreatitis. The label does not give other specific alcohol instructions.

🤰 Sitagliptin in pregnancy and breastfeeding

Pregnancy

The label says there is not enough data to know whether sitagliptin causes major birth defects or miscarriage. It also says poorly controlled diabetes in pregnancy carries risks for both the mother and the baby. The label says it is not known if sitagliptin will harm an unborn baby, and if you are pregnant, you should talk with your doctor about the best way to control your blood sugar.

Breastfeeding

The label says it is not known if sitagliptin passes into breast milk. Sitagliptin has been found in the milk of lactating rats, so it may be present in human milk. Talk with your doctor about the best way to feed your baby if you take sitagliptin.

🗓️ Storage, missed doses and taking too much

Storage

The label text provided does not include the full storage instructions. Ask your pharmacist how to store your tablets.

If a dose is missed

The label says to take a missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not take two doses at the same time.

If too much is taken

The label says that if you take too much sitagliptin, call your doctor or your local Poison Control Center right away. The label says sitagliptin can be partly removed from the body by hemodialysis, but the label does not give other specific treatment steps for patients.

🗒️ Questions to ask about Sitagliptin

🎯 Check what you understood

1. According to the label, how often is sitagliptin taken?

2. Which condition does the label say sitagliptin should not be used in?

3. What does the label say to do if you miss a dose and it is almost time for your next dose?

❓ Sitagliptin: frequently asked questions

Can I take sitagliptin with food?

Yes. The label says sitagliptin can be taken with or without food.

What should I do if I think I took too much?

The label says to call your doctor or your local Poison Control Center right away.

Can sitagliptin cause low blood sugar?

Yes. The label says low blood sugar can happen, and the risk is higher when sitagliptin is taken with a sulfonylurea or insulin.

What are signs of a serious allergic reaction?

The label lists rash, raised red patches on the skin (hives), and swelling of the face, lips, tongue, and throat that may cause trouble breathing or swallowing. Get medical help right away if these occur.

Is sitagliptin used for type 1 diabetes?

No. The label says sitagliptin should not be used in patients with type 1 diabetes.

🧪 Tests and reports linked to Sitagliptin

The label text mentions these. If you have one of these reports, get every line of it explained.

📖 Medical words used on this page

  • Allergic reaction

    An allergic reaction is when the immune system overreacts to something harmless, such as a medicine or food, causing symptoms from a rash to swelling.

  • Anaphylaxis

    Anaphylaxis is a severe, whole-body allergic reaction that comes on fast and is a medical emergency needing urgent help.

  • Angioedema

    Angioedema is swelling deep under the skin, often of the lips, face, tongue or throat. Swelling of the throat or tongue needs emergency help.

  • Congenital malformations

    Congenital malformations are differences in the structure of the body that are present at birth, such as heart, spine or lip and palate defects.

  • Dialysis

    Dialysis is a treatment that removes waste and extra fluid from the blood when the kidneys can no longer do this well enough.

  • Edema

    Edema is swelling caused by extra fluid trapped in the body's tissues, often in the feet, ankles and legs.

  • Film-coated

    Film-coated means a tablet has a thin outer layer that makes it easier to swallow, masks taste, or protects the medicine inside.

  • HbA1c

    HbA1c shows your average blood sugar over roughly the past two to three months by measuring how much sugar is attached to red blood cells.

  • Heart failure

    Heart failure means the heart is not pumping or filling as well as it should, so it struggles to meet the body's needs. It does not mean the heart has stopped.

  • Hemodialysis

    Hemodialysis is a treatment where a machine filters the blood to remove waste and extra fluid when the kidneys cannot do it well enough.

  • Hemoglobin

    Hemoglobin is the protein in red blood cells that carries oxygen around the body; its level is a key part of a full blood count.

  • Hypersensitivity

    Hypersensitivity means the immune system overreacts to something, such as a medicine. It covers allergic reactions from mild rash to severe reactions.

  • Hypertension

    Hypertension means high blood pressure: the force of blood against artery walls stays higher than it should over time.

  • Hypoglycemia

    Hypoglycemia means blood sugar (glucose) has dropped too low. It can cause shakiness, sweating and confusion, and severe cases need urgent help.

📖 Medical words on this page

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Source: official FDA drug label (label updated 2026-08-12). Read the full label on DailyMed

MedicDecode explains the official label in plain words. It is not medical advice and does not replace your doctor or pharmacist. Never start, stop or change a medicine because of what you read here.