On this page · 8 sections

Lactrase

Generic name: lactase

Brand names: Lactaid, Lactaid Fast Act, Lactaid Ultra, Lac-Dose, Lactrase, Surelac

Last updated November 2, 2026 0 views
Share

What is Lactrase?

Lactrase is an enzyme that helps your body break down lactose found in dairy products. If you are lactose-intolerant, eating dairy can lead to gas, bloating, stomach pain, or diarrhea.

Lactrase is a dietary supplement that can help avoid these symptoms for people with lactose intolerance who consume milk or other dairy products.

It is not known if Lactrase is effective for treating any medical condition. The FDA has not approved this product for medicinal use. This medicine should not replace any medication your doctor has prescribed.

Lactrase is often sold as a dietary supplement. There are no regulated manufacturing standards for supplements, and some products on the market have been found to be contaminated with toxic metals or other drugs. To reduce the risk of contamination, dietary supplements should be bought from a trustworthy source.

Lactrase may also be used for reasons not mentioned in this product guide.

This section was rewritten for readability and reviewed for meaning.

How should I take Lactrase?

When thinking about using a supplement, talk to your doctor. You might also want to consult someone who is trained in herbal or health supplements.

If you decide to use Lactrase, follow the instructions on the package or the advice of your doctor, pharmacist, or other healthcare provider. Do not use more of this product than what is recommended on the label.

Take Lactrase with the first bite or sip of any dairy product you eat or drink. You can take this medicine every day with every meal and snack that includes dairy.

If you eat more dairy products after 30 to 45 minutes, take Lactrase again.

Call your doctor if you still have symptoms of lactose intolerance or if your symptoms worsen while using this product.

Store at room temperature away from moisture and heat. Do not refrigerate.

This section was rewritten for readability and reviewed for meaning.

Warnings

Follow all instructions on the label and package. Use exactly as directed.

This section was rewritten for readability and reviewed for meaning.

Before taking this medicine

This product may have phenylalanine and could be dangerous if you have phenylketonuria (PKU).

Check with a doctor, pharmacist, or another healthcare provider to see if it is safe for you to use this product if you have other medical conditions.

Do not give Lactrase to a child under 4 years old.

Talk to a doctor before using this product if you are pregnant or breastfeeding.

This section was rewritten for readability and reviewed for meaning.

Lactrase side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Less serious side effects may happen more often, and you may not experience any at all.

This is not a complete list of side effects, and others may occur. Call your doctor for medical advice about side effects. You can report side effects to the FDA at 1-800-FDA-1088.

This section was rewritten for readability and reviewed for meaning.

What happens if I miss a dose?

Take your dose as soon as possible at the start of a meal or snack. Do not take two doses at the same time.

This section was rewritten for readability and reviewed for meaning.

What happens if I overdose?

An overdose of Lactrase is not likely to cause serious symptoms.

Do not take your dose too early or too late compared to a meal that has dairy, or Lactrase may not work as well.

This section was rewritten for readability and reviewed for meaning.

What other drugs will affect Lactrase?

Other drugs may affect Lactrase, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all other medicines you use.

This section was rewritten for readability and reviewed for meaning.

Related medicines

Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
General medicine information Consumer-friendly language

Content is provided for education and is not medical advice. See our medical disclaimer.