Updated: March 26, 2026

What Is Tolak? Uses, Dosage, and What You Need to Know in 2026

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Peter Daggett

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What Is Tolak?
What Is Tolak Used For?
How Do You Apply Tolak? (Correct Dosage and Application)
Who Should NOT Use Tolak?
What Does Tolak Cost?
Learn More

Tolak (fluorouracil 4% cream) treats precancerous actinic keratosis on the face, ears, and scalp. Here's everything you need to know about this medication in 2026.

If your dermatologist just prescribed Tolak, you may be wondering: what exactly is this cream, why is my skin going to look so bad, and how does the treatment work? This guide covers everything you need to know about Tolak — its uses, how to apply it correctly, what to expect, and key safety information.

What Is Tolak?

Tolak is a brand-name prescription cream containing fluorouracil at a 4% concentration (40 mg of fluorouracil per gram of cream). It is manufactured by Hill Dermaceuticals, Inc. and is classified as a nucleoside metabolic inhibitor — a type of topical antimetabolite or topical chemotherapy agent.

Tolak is available in a single dosage form: white cream in a 40-gram tube. It received its original concept of FDA approval in 1962 as fluorouracil, making it one of the most well-studied topical treatments in dermatology.

What Is Tolak Used For?

Tolak is FDA-approved for one specific indication: the topical treatment of actinic keratosis (AK) lesions on the face, ears, and scalp.

Actinic keratosis (also called solar keratosis) is a precancerous skin condition caused by chronic exposure to ultraviolet (UV) radiation — from sunlight, tanning beds, or sunlamps. It typically appears as rough, scaly, sometimes reddish patches on sun-exposed skin. While not all AKs become cancerous, they are considered precursors to squamous cell carcinoma (SCC), and dermatologists routinely treat them to prevent progression to skin cancer.

Actinic keratosis is extremely common — affecting over 40 million Americans — and is most prevalent in older adults with significant cumulative sun exposure, particularly those with fair skin.

How Do You Apply Tolak? (Correct Dosage and Application)

The standard Tolak dosing regimen is:

Frequency: Once daily
Duration: 4 weeks (as tolerated)
Area: Face, ears, and/or scalp only

Step-by-step application instructions:

Wash, rinse, and dry the treatment area thoroughly before applying Tolak
Apply a thin film of Tolak to cover the actinic keratosis lesions
Use your fingertips to gently massage the cream uniformly into the skin (or use a non-metal applicator or surgical gloves)
Wash hands thoroughly immediately after applying
Do not apply Tolak near the eyes, nose, mouth, or mucous membranes
Do not cover the treated area with bandages or tight dressings unless your doctor directs you to

Who Should NOT Use Tolak?

Tolak is contraindicated in the following groups:

Pregnant women: Tolak is Pregnancy Category X. Fluorouracil can cause miscarriage and birth defects (cleft lip, cleft palate, ventricular septal defect). Women of reproductive potential must use effective contraception during treatment.
Breastfeeding women: Do not use Tolak while breastfeeding due to potential harm to nursing infants.
Patients with DPD deficiency: Dihydropyrimidine dehydrogenase (DPD) deficiency prevents normal breakdown of fluorouracil, leading to life-threatening systemic toxicity with even topical use.
Patients with peanut allergy: Tolak cream contains peanut oil. Patients with peanut allergy should not use Tolak.
Patients under 18: Tolak has not been approved for pediatric use.

What Does Tolak Cost?

The average retail price for a 40g tube of Tolak is approximately $235. With a GoodRx coupon, prices can drop to as low as $43.78 at participating pharmacies. Hill Dermaceuticals' own pharmacy offers Tolak at a flat $40 cash price including shipping. Generic fluorouracil 5% cream — a more widely available alternative — costs as little as $29-37 with GoodRx coupons.

Learn More

For more details on specific topics, read our guides on how to find Tolak in stock near you and Tolak side effects: what to expect.

Frequently Asked Questions

Tolak (fluorouracil 4% cream) is FDA-approved for the topical treatment of actinic keratosis (AK) lesions on the face, ears, and scalp. Actinic keratosis consists of rough, scaly, precancerous skin patches caused by long-term sun exposure. Tolak kills abnormal cells in these lesions to prevent them from progressing to squamous cell carcinoma.

Tolak is applied once daily for 4 weeks. Skin reactions (redness, scaling, crusting) develop during treatment as the medication destroys abnormal cells. Healing begins after you stop the cream, and most patients see their skin return to baseline within 4 weeks after completing the treatment course.

Technically, yes. Fluorouracil — the active ingredient in Tolak — is a chemotherapy agent (antimetabolite) that interferes with DNA synthesis. However, when used topically as in Tolak, the systemic absorption is very limited and it acts locally on skin lesions. It is not the same as intravenous chemotherapy used for systemic cancers.

No. Tolak is specifically FDA-approved for use on the face, ears, and scalp only. It is not indicated for use on the hands, arms, or other body areas. Other fluorouracil formulations (like Efudex 5%) may be prescribed for AKs on other body parts, but this requires a separate prescription and instructions from your dermatologist.

Yes. Do not use Tolak after the expiration date printed on the tube. Store at room temperature (68-77°F / 20-25°C), away from moisture and heat. Do not freeze Tolak — freezing can damage the cream formulation.

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