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Carb-O-Lac HP (topical)

Generic name: ammonium lactate and urea (topical) [ a-MOE-nee-um-LAK-tate-and-YOO-ree-a-TOP-i-kal ]
Brand names: Carb-O-Lac HP, Carb-O-Lac5, Ultralytic 2 topical, Ultralytic topical
Drug class: Topical emollients

Medically reviewed by on Aug 1, 2023. Written by Cerner Multum.

What is Carb-O-Lac HP topical?

Carb-O-Lac HP (for the skin) is a combination medicine that is used to treat rough or scaly skin and soften cracked skin or calluses.

Carb-O-Lac HP may also be used for purposes not listed in this medication guide.

Carb-O-Lac HP side effects

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

Less serious side effects may include:

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


Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

Before taking this medicine

You should not use Carb-O-Lac HP if you have ever had an allergic reaction to ammonium lactate or urea.

Ask a doctor or pharmacist if this medicine is safe to use if you have ever had an allergy to food, medicine, dyes, or preservatives.

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

How should I use Carb-O-Lac HP?

Use exactly as directed on the label, or as prescribed by your doctor.

Do not take by mouth. Topical medicine is for use only on the skin.

Apply only a thin film to the affected skin. For best results, apply this medicine right after a bath or shower, while your skin is still damp. You may cover the treated skin with a bandage or gauze.

Store at room temperature away from moisture and heat. Keep the bottle tightly closed when not in use.

What happens if I miss a dose?

Apply the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not apply two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while using Carb-O-Lac HP?

Avoid using Carb-O-Lac HP on open wounds or burns, or on skin that is sensitive, irritated, or infected.

Avoid getting the medicine in your eyes, nose, mouth, or on your lips. If this does happen, rinse with water.

Avoid using other medications on the areas you treat with Carb-O-Lac HP, unless your doctor tells you to.

What other drugs will affect Carb-O-Lac HP?

Medicine used on the skin is not likely to be affected by other drugs you use. But many drugs can interact with each other. Tell each of your healthcare providers about all medicines you use, including prescription and over-the-counter medicines, vitamins, and herbal products.

More about Carb-O-Lac HP (ammonium lactate/urea topical)

Patient resources

Other brands

Carb-O-Lac5, Kerasal Ultra 20, Ultralytic, Ultralytic 2

Related treatment guides

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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