Lactose in medicines: what to check with your pharmacist

Lactose can appear in some tablets and capsules as an inactive ingredient, also called an excipient. That does not mean every medicine contains it—and it does not mean you should stop or change a medicine on your own. A pharmacist can help you check the exact brand, strength and dosage form you use.

Why lactose may be used in medicines

Medicines contain an active ingredient that produces the intended effect, plus inactive ingredients that help with manufacturing, stability, taste or tablet structure. Lactose may be used as a filler in some formulations. The ingredient list can differ between brands, strengths and forms of the same medicine, so a general internet list is not a reliable substitute for checking your own pack.

Where to look for ingredient information

1. Check the carton, bottle and blister packaging. Look for ingredient and allergen statements, but remember that the label may not list every inactive ingredient.
2. Read the Consumer Medicine Information leaflet. Prescription and some over-the-counter medicines have a CMI that lists active and inactive ingredients. Your pharmacist can provide it or help you find the current version.
3. Check the Australian Register of Therapeutic Goods. The TGA explains that an ARTG summary can list the formulation’s inactive ingredients. Search using the medicine name or the AUST number on the label.
4. Ask the pharmacist to verify the exact product. Give them the medicine name, brand, strength and dosage form. If the source of an ingredient or possible cross-contact matters, the manufacturer may need to confirm it.

The TGA’s guide to finding ingredients in Australian medicines explains these sources in more detail.

A pharmacist checklist

Take a photo of the front and back of the pack, or bring the medicine with you, and ask:

• Does this exact brand, strength and dosage form contain lactose?
• Is the information current for this pack and manufacturer?
• Is there a clinically suitable alternative formulation if one is needed?
• Could changing brands alter how I should take or store the medicine?
• Should my prescriber be involved before any change is made?

Do not stop a prescribed medicine, skip doses or switch brands without advice from your pharmacist or prescriber.

Lactose intolerance is not the same as milk allergy

Lactose intolerance involves difficulty digesting lactose, the sugar in milk. A milk allergy is an immune reaction to milk proteins and requires different precautions. A product that contains lactose should not automatically be treated as equivalent to a milk-protein ingredient, and the absence of the word “lactose” does not by itself answer every allergy question. If you have a diagnosed milk allergy, ask your allergy specialist, doctor or pharmacist to assess the exact product.

What about lactase enzyme products?

Lactase tablets and drops are designed for lactose in food or drinks and should be used according to their directions. They are not a reason to alter a prescribed medicine or to assume a medicine is suitable for you. For general information about food-related options, see the Intoleran Australia lactose range and Healthdirect’s lactose intolerance guidance. Ask your pharmacist or doctor for advice about medicines.

When to seek professional advice

Speak with a pharmacist or doctor if you are unsure about an ingredient, if symptoms are persistent or severe, or if you have a diagnosed allergy or a condition that requires strict avoidance of particular sugars. A qualified professional can weigh the ingredient concern against the benefits and risks of the medicine and help identify an appropriate option.

Quick summary

• Lactose is an inactive ingredient in some—not all—medicines.
• Check the exact brand, strength and dosage form rather than relying on a generic list.
• Use the label, CMI, ARTG information and pharmacist or manufacturer confirmation.
• Do not stop or change a medicine without professional advice.
• Keep lactose intolerance and milk allergy as separate questions.

For everyday meal ideas that make ingredient checking straightforward, browse our recipe collection.