Nasonex + blood sugar level interactions

Answer by Dr. Albana Greca, MD, MMedSc

Hello,

This is a reasonable concern because Nasonex belongs to the steroid family, and we know that steroids can affect blood sugar. However, not all steroid medicines have the same effect.

Can Nasonex Raise Blood Sugar?

Nasonex is sprayed directly into the nose, so much less of the medicine enters the bloodstream compared with prednisone, methylprednisolone, or steroid injections. For most people, I would not expect it to cause a large rise in glucose.

That said, some people may be more sensitive, especially if they already have diabetes or prediabetes, use Nasonex for long periods, use more than the recommended dose, or take other steroid medicines at the same time.

This is quite different from oral steroids, which can have a much stronger effect on glucose. You can see this comparison in our answer about whether a Medrol Dosepak can raise blood sugar.

Does This Mean Nasonex Should Be Stopped?

Not necessarily. Nasonex is not automatically unsafe for someone with diabetes. Many people with diabetes use nasal steroid sprays without significant problems.

I would not stop a prescribed medicine simply because one glucose reading changed. Instead, look for a pattern. If readings started rising after Nasonex was introduced and remain higher than usual, that is worth discussing with the doctor.

Could Something Else Be Raising the Glucose?

Yes. Allergy season itself can bring several changes that affect blood sugar. Poor sleep from nasal congestion, stress, illness, reduced activity, changes in eating habits, and other medications can all influence glucose.

This is why I would not blame Nasonex immediately. A few days of recorded fasting and after-meal readings can often show whether there is a real trend. Our guide to blood sugar levels by time of day can help you understand those readings.

What Should You Do Now?

• Use Nasonex only at the recommended dose.


• Check blood sugar consistently for several days if readings have changed.


• Write down when Nasonex is used and what the glucose readings are.


• Tell the doctor about any other steroid tablets, injections, inhalers, creams, or sprays being used.


• If glucose remains high, ask whether fasting glucose and HbA1c should be checked.

If diabetes is a concern, these blood tests used to diagnose diabetes explain what doctors usually look for.

When Should You Contact the Doctor?

Contact the doctor if blood sugar repeatedly stays above the person's usual target, particularly if fasting readings are repeatedly 100–125 mg/dL or higher, or if symptoms such as increased thirst, frequent urination, blurred vision, unusual tiredness, or unexplained weight loss appear.

The doctor should also know about frequent nosebleeds, severe nasal irritation, vision problems, or the need to use steroid medicines regularly.

Most Asked Questions

Does Nasonex raise blood sugar?

Usually not by much, because only a small amount of the nasal steroid reaches the bloodstream. Some people may still notice a change.

Can someone with diabetes use Nasonex?

Often yes, when it is appropriate for their allergies. If glucose readings change, they should be monitored and discussed with the doctor.

Is Nasonex different from steroid tablets?

Yes. Nasal steroids generally have much less whole-body exposure than steroid tablets, so they are usually less likely to cause a strong rise in blood sugar.

Related Questions

• Can furosemide, Nasonex, and other medicines affect diabetes and metformin?


• Can Medrol Dosepak raise blood sugar dangerously?


• Can cephalexin affect blood sugar?

Related Resources

• Blood tests for diabetes


• Blood sugar levels by time of day


• Dangerous blood sugar levels


• Blood sugar log sheet

Last reviewed: July 2026.