Januvia (Sitagliptin) and Onglyza (Saxagliptin) Diabetes Medications

Answer by Dr. Albana Greca, MD, MMedSc

Hello,

When cinnamon, alpha-lipoic acid, medicine, diet and activity change together, an anecdote cannot show which change produced the result.

What Are Januvia and Onglyza?

Januvia is the brand name for sitagliptin, and Onglyza is the brand name for saxagliptin. Both are DPP-4 inhibitors used to improve glucose control in adults with type 2 diabetes.

They prolong incretin hormones, helping the pancreas release insulin and reducing glucagon when glucose is elevated. Used alone, DPP-4 inhibitors usually have a low hypoglycemia risk.

Januvia and Onglyza perform a similar job and are not normally combined with each other. A patient may use one of them with metformin, insulin or another drug when clinically appropriate. Our diabetes medication guide explains why treatment combinations must be selected individually.

Can We Credit Cinnamon for the Lower Readings?

Not from the information provided. Glucose changes from day to day according to meals, activity, sleep, stress, illness, medicine timing and meter variation. A person may also become more careful with food and exercise after starting a supplement.

Cinnamon studies in type 2 diabetes are inconsistent. Some report small fasting-glucose improvements, while others show little or no meaningful HbA1c effect. Products also vary in species, dose and quality, so cinnamon cannot replace proven treatment.

A successful personal story can suggest a question for research, but it cannot prove cause and effect. The safest conclusion is that the person’s complete treatment plan may have contributed.

How Could the Effect Be Evaluated More Carefully?

Ideally, change one treatment factor at a time under medical supervision. Keep medicines, meals, testing times and activity reasonably consistent, then compare several weeks rather than isolated readings.

• Record fasting, before-meal and correctly timed after-meal glucose.


• Record prescription doses, supplements, meals, activity, illness and symptoms.


• Review patterns rather than selecting only the best readings.


• Repeat HbA1c after the interval recommended by the clinician.


• Do not reduce prescription medicine simply because several home readings improve.

Our guide to blood sugar levels by time of day explains why readings must be compared under similar conditions.

Can Cinnamon or Alpha-Lipoic Acid Cause Low Glucose?

Cinnamon may modestly lower glucose in some people, but its effect is unpredictable. Alpha-lipoic acid is studied mainly for diabetic neuropathy, not as a dependable glucose-lowering substitute.

Januvia or Onglyza alone rarely causes hypoglycemia, but the risk rises when either is combined with insulin or a sulfonylurea such as gliclazide, glipizide or glimepiride. Adding supplements with possible glucose-lowering effects may create further uncertainty.

Important Safety Differences

Kidney function affects dosing of both medicines. Uncommon serious warnings include pancreatitis, severe allergy, severe joint pain and bullous pemphigoid.

Saxagliptin carries an additional heart-failure warning. People with heart failure, kidney disease, new shortness of breath, rapid weight gain or swelling of the feet and legs should discuss this specifically with their prescriber. Sitagliptin should not automatically be treated as interchangeable without reviewing kidney function, medical history and other medicines.

Is “Natural” Automatically Safer?

No. Prescription medicines have standardized doses and documented risks. Supplements may also cause side effects or interactions, while strength and purity can vary.

Cassia cinnamon may contain coumarin, which can harm the liver in susceptible people or at high intake. Capsules are not equivalent to small culinary amounts. Report every supplement, especially with liver disease, blood thinners or several diabetes medicines.

What Should a Patient Do?

• Use either sitagliptin or saxagliptin only when prescribed; do not combine them.


• Do not replace prescribed medicine with cinnamon or another supplement.


• Show the clinician the supplement label, dose and cinnamon species if known.


• Monitor glucose consistently after any approved treatment change.


• Base medication decisions on the full glucose pattern, HbA1c, side effects and medical risks.

Healthy food choices, physical activity, sleep and weight management remain important, but they should be combined with appropriate medical treatment. Our guide to controlling diabetes safely explains how these elements work together.

Related Resources

• Newer medicines for type 2 diabetes


• Acceptable blood glucose levels


• Benefits and side effects of diabetes medicines

This educational answer does not replace individualized medication or supplement advice from a qualified clinician or pharmacist.