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Medically reviewed by Last updated on Aug 18, 2019.


(LAK tase)

Dosage Forms

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Tablet, Oral:

Lac-Dose: 3000 units

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]
  • 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

• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)

• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.

Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for healthcare professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience and judgment in diagnosing, treating and advising patients.

Further information

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