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Medically reviewed by Last updated on Sep 15, 2021.


(LAK tase)

Dosage Forms

Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product

Tablet, Oral:

Lac-Dose: 3000 units [DSC]

Lactaid: 3000 units

Lactaid Fast Act: 9000 units

Lactase Enzyme: 3000 units

Lactase Fast Acting: 9000 units

Surelac: 3000 units

Tablet Chewable, Oral:

Lactaid Fast Act: 9000 units [vanilla flavor]

Brand Names: U.S.

  • Lac-Dose [OTC] [DSC]
  • Lactaid Fast Act [OTC]
  • Lactaid [OTC]
  • Lactase Enzyme [OTC]
  • Lactase Fast Acting [OTC]
  • Surelac [OTC]

Pharmacologic Category

  • Enzyme

Use: Labeled Indications

Lactose intolerance: Helps digest lactose in milk for patients with lactose intolerance

Dosing: Adult

Dosage varies per product; also consult specific product information. Note: If the patient continues to eat dairy foods after 30 to 45 minutes, taking an additional serving is recommended.

Lactose intolerance: Oral: 1 to 3 tablets with first bite of food containing dairy

Dosing: Geriatric

Refer to adult dosing.

Dosing: Pediatric

Children ≥4 years and Adolescents: Refer to adult dosing.

Dietary Considerations

May be taken with meals. Some products may contain sodium.

Drug Interactions

There are no known significant interactions.

Patient Education

What is this drug used for?

• It is used to help break down dairy products.

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

• Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.

Note: This is not a comprehensive list of all side effects. Talk to your doctor if you have questions.

Consumer Information Use and Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only the healthcare provider has the knowledge and training to decide which medicines are right for a specific patient. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a limited summary of general information about the medicine's uses from the patient education leaflet and is not intended to be comprehensive. This limited summary does NOT include all information available about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not intended to provide medical advice, diagnosis or treatment and does not replace information you receive from the healthcare provider. For a more detailed summary of information about the risks and benefits of using this medicine, please speak with your healthcare provider and review the entire patient education leaflet.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.