Afrezza Drug Interactions: What to Avoid and What to Tell Your Doctor

Why Drug Interactions Matter With Afrezza

Afrezza is an inhaled insulin used to control mealtime blood sugar in adults with type 1 and type 2 diabetes. Like all insulins, it interacts with many other medications. Some drugs can make Afrezza work too well (increasing your risk of low blood sugar), while others can reduce its effectiveness (raising your blood sugar). Knowing these interactions helps you stay safe and keeps your blood sugar well managed.

If you are new to Afrezza, start with our overview: What Is Afrezza? Uses, Dosage, and What You Need to Know.

Medications That Can Increase Hypoglycemia Risk

The following medications, when taken with Afrezza, may cause your blood sugar to drop too low. Your doctor may need to adjust your Afrezza dose if you take any of these:

Other Diabetes Medications

If you take other blood sugar-lowering medications alongside Afrezza — such as metformin, sulfonylureas (glipizide, glyburide), GLP-1 agonists (Ozempic, Trulicity), or other insulins — your overall risk of hypoglycemia increases. Your doctor will carefully coordinate your doses.

ACE Inhibitors and ARBs

These blood pressure medications (lisinopril, enalapril, losartan, valsartan) can increase the blood sugar-lowering effect of insulin. Many diabetes patients take these drugs because diabetes and high blood pressure often go together. Let your doctor know if you start or stop one of these medications.

MAO Inhibitors

Monoamine oxidase inhibitors, used for depression, can increase the effect of insulin and raise your risk of hypoglycemia.

Fluoxetine (Prozac)

This common antidepressant has been shown to increase insulin sensitivity, which can lead to lower blood sugar when combined with Afrezza.

Salicylates (High-Dose Aspirin)

High doses of aspirin or other salicylates can enhance the blood sugar-lowering effect of insulin. Regular low-dose aspirin (81 mg) used for heart protection is generally not a concern, but tell your doctor if you take higher doses.

Medications That Can Raise Blood Sugar

Some medications work against insulin and can make Afrezza less effective. If you take any of the following, your doctor may need to increase your Afrezza dose:

Corticosteroids

Prednisone, dexamethasone, and other corticosteroids are well known for raising blood sugar. Even short courses of steroids (for asthma flares, allergic reactions, or inflammation) can significantly increase your blood sugar levels. Note: if you have asthma, Afrezza is contraindicated regardless of steroid use.

Diuretics (Water Pills)

Thiazide diuretics like hydrochlorothiazide can increase blood sugar. If your doctor adds or changes your diuretic, monitor your blood sugar more closely.

Thyroid Hormones

Levothyroxine and other thyroid medications can raise blood sugar. If your thyroid dose changes, your Afrezza dose may need adjusting too.

Estrogens and Oral Contraceptives

Birth control pills and hormone replacement therapy containing estrogen can increase blood sugar levels. Let your doctor know about any hormonal medications you take.

Beta-Blockers: A Special Case

Beta-blockers (metoprolol, atenolol, propranolol) deserve special attention. They do not necessarily change how much Afrezza lowers your blood sugar, but they can mask the symptoms of hypoglycemia. Normally, when your blood sugar drops too low, you feel shaky, your heart races, and you sweat. Beta-blockers can block these warning signs, making it harder to tell when you are having a low.

If you take a beta-blocker with Afrezza, monitor your blood sugar more frequently and learn to recognize non-adrenergic symptoms of low blood sugar, such as:

• Confusion or difficulty concentrating
• Irritability or mood changes
• Hunger
• Blurred vision
• Headache

Alcohol and Afrezza

Alcohol has an unpredictable effect on blood sugar. It can either raise or lower your blood sugar depending on how much you drink, whether you eat with it, and other factors. In general:

• Moderate alcohol with food may have minimal effect
• Drinking on an empty stomach can cause dangerous low blood sugar
• Heavy drinking can impair your ability to recognize and treat hypoglycemia

If you choose to drink alcohol while using Afrezza, do so in moderation, always eat food with your drink, and check your blood sugar more often.

What to Tell Your Doctor

Before starting Afrezza, give your doctor a complete list of everything you take, including:

• All prescription medications
• Over-the-counter drugs (including pain relievers and cold medicines)
• Vitamins and supplements
• Herbal products

Also tell your doctor if you:

• Start, stop, or change the dose of any medication
• Use tobacco products (Afrezza is contraindicated in smokers)
• Drink alcohol regularly

How to Stay Safe

• Monitor your blood sugar regularly — Especially when starting a new medication or changing doses of existing ones.
• Know the signs of low blood sugar — Shakiness, sweating, confusion, rapid heartbeat, hunger.
• Keep fast-acting glucose nearby — Juice, glucose tablets, or candy can quickly treat a low.
• Communicate with all your doctors — Make sure every provider who prescribes medication for you knows you take Afrezza.
• Do not adjust your Afrezza dose on your own — Always talk to your prescriber before changing your insulin dose.

For more information about Afrezza safety, read Afrezza Side Effects: What to Expect and When to Call Your Doctor.

Finding and Affording Afrezza

If you are already taking Afrezza and need help with availability or cost, these resources can help:

• MedFinder — Check pharmacy stock near you
• How to Save Money on Afrezza
• How to Check Pharmacy Stock Without Calling