Efudex vs. Aldara for Skin Cancer and Actinic Keratosis: Important Differences and Potential Risks.

Key takeaways

Fluorouracil (Efudex) and Imiquimod (Aldara, Zyclara) are both topical treatments used for skin conditions, but they work differently and treat different issues. Fluorouracil is an antimetabolite that interferes with the DNA of pre-cancerous and cancerous cells, making it effective for actinic keratosis and basal cell carcinoma. It is applied twice daily and can cause skin burning, crusting, and irritation. Imiquimod, on the other hand, activates the immune system to fight off abnormal skin cells and is used for actinic keratosis, genital/anal warts, and superficial basal cell carcinoma. It has a more varied dosing schedule depending on the condition and can cause skin reactions, flu-like symptoms, and fatigue. Unlike Fluorouracil, Imiquimod is not considered a form of chemotherapy. Both medications require careful application and have specific instructions to avoid side effects, but Imiquimod also requires you to wash it off after a certain period, while Fluorouracil does not.

Fluorouracil

(Efudex)

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Imiquimod

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Summary for Efudex

Prescription only

Fluorouracil (Efudex) topical is an antimetabolite. It's available as 5% topical cream and solution, and as 2% solution. Both strengths can treat actinic keratosis, a precancerous skin condition caused by exposure to ultraviolet (UV) light over time. But only fluorouracil 5% is approved to treat basal cell carcinoma, a type of skin cancer. Fluorouracil (Efudex) topical is applied directly on the affected area(s) twice daily for 2 to 6 weeks, depending on what condition you're being treated for. Side effects of this medication can include skin burning, crusting, and irritation.

Indications for Efudex

Actinic (or solar) keratosis (scaly pre-cancerous spot or growth on the skin) in adults
Basal cell carcinoma (certain type of skin cancer) in adults

Pros and Cons for Efudex

Pros

Preferred treatment option for actinic keratoses
Up to a 90% cure rate for people with basal cell carcinoma
Treatment might last as short as 2-3 weeks, depending on your condition

Cons

Can cause uncomfortable skin reactions
Need to use twice daily
Hasn't been studied in children
Not safe to use during pregnancy

Common Side Effects for Efudex

Crusting of the skin
Stinging or burning feeling of the skin
Itchiness
Soreness on the skin
Scarring

Warnings for Efudex

Avoid sensitive skin areas
Don't cover skin areas after application
Sunburn
Harm to unborn baby
Rare toxicity reaction

Summary for Aldara

Prescription only

Imiquimod is a topical cream that works well for various skin conditions, including certain skin cancers and genital/anal warts. It takes a long time to work and often causes irritation. The instructions on how often you use the medication also depends on your skin condition and the strength of cream you're using.

Indications for Aldara

Face or scalp actinic keratosis (scaly precancerous spot or growth on the skin) in adults - all brands and strengths
Genital and anal warts in adults and children 12 years and older - Zyclara 3.75% and Aldara 5% only
Superficial basal cell carcinoma (a type of skin cancer) in adults - Aldara 5% only

Pros and Cons for Aldara

Pros

A first-choice treatment for genital and anal warts
A good option if you prefer treating your condition privately at home rather than getting in-office procedures
Available as a lower-cost, generic form

Cons

Need to remember to wash off after the recommended amount of time (usually first thing in the morning)
Doesn't work as fast as lasers or surgery
Not the first-choice treatment for skin cancer
Skin reactions and irritation are pretty common.

Common Side Effects for Aldara

Skin reaction (33% total), including itching (20%), burning (6%), bleeding, stinging, and pain
Common cold symptoms (15%)
Sinus inflammation (7%)
Headache (5%)