Medication Search​ - Zyclara

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Common Name:

imiquimod 3.75% cream (for actinic keratosis)


How does Zyclara work? What will it do for me?

Imiquimod cream belongs to a group of medications called immune response modifiers. It works by stimulating the body’s defenses to fight certain types of skin conditions. Imiquimod cream is used to treat actinic keratosis (AK) on the face or balding scalp in adults. AK is a skin condition that could turn into skin cancer (symptoms include rough, red, scaly patches or lesions, or crusts) that is caused by chronic sun exposure.

This medication may be available under multiple brand names and/or in several different forms. Any specific brand name of this medication may not be available in all of the forms or approved for all of the conditions discussed here. As well, some forms of this medication may not be used for all of the conditions discussed here.

Your doctor may have suggested this medication for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking this medication, speak to your doctor. Do not stop taking this medication without consulting your doctor.

Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take this medication if their doctor has not prescribed it.

What form(s) does Zyclara come in?

Each gram of off-white to faintly yellow cream contains imiquimod 25 mg (2.5%). Nonmedicinal ingredients: isostearic acid, cetyl alcohol, stearyl alcohol, white petrolatum, polysorbate 60, sorbitan monostearate, glycerin, xanthan gum, purified water, benzyl alcohol, methylparaben, and propylparaben.

Each gram of off-white to faintly yellow cream contains imiquimod 37.5 mg (3.75%). Nonmedicinal ingredients: isostearic acid, cetyl alcohol, stearyl alcohol, white petrolatum, polysorbate 60, sorbitan monostearate, glycerin, xanthan gum, purified water, benzyl alcohol, methylparaben, and propylparaben.

How should I use Zyclara?

Before applying the cream, wash your hands with soap and water, gently wash the treatment area with mild soap and water, and allow the skin to dry thoroughly. Apply imiquimod cream to the affected skin area once daily just before going to bed. Do not apply to areas larger than either the face or the balding scalp. Apply a thin layer of this medication onto the clean, dry AK lesion and rub gently into the skin until the cream is absorbed. Avoid contact with eyes, lips, and nostrils. If the cream gets in your eyes, rinse them with large amounts of water. Wash your hands after using the medication. Do not apply an occlusive dressing (one made of airtight material) over this medication.

Leave the medication on the skin area for approximately 8 hours, and then remove it by washing the treated area with mild soap and water. Continue to use this medication for a total of 2 treatment cycles of 2 weeks, separated by a 2-week period with no treatment, or as directed by your doctor. A rest period from medication for several days may be taken depending on your discomfort and the severity of skin reactions, as directed by your doctor. Each treatment cycle should not last longer than 2 weeks even if a rest period is taken.

Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.

This medication is for external use only. Do not take it by mouth.

You may apply up to 2 packets or medication or 2 full actuations of the pump to the treatment area. If you are using the packets, use a new packet for each application. Throw away the remainder of an opened packet each time.

It is important to use this medication exactly as prescribed by your doctor. If you miss a dose, skip the missed dose and apply the cream at bedtime the next night. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.

Store this medication at room temperature, prevent it from freezing, and keep it out of the reach of children.

Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.

Who should NOT take Zyclara?

Do not use this medication if you are allergic to imiquimod or any ingredients of the medication.

What side effects are possible with Zyclara?

Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below are not experienced by everyone who takes this medication. If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor.

The following side effects have been reported by at least 1% of people taking this medication. Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

  • blistering on skin
  • burning or stinging of skin (mild)
  • cracked lips
  • decreased appetite
  • diarrhea
  • dizziness
  • dry skin
  • fatigue
  • flaking or peeling of skin
  • headache
  • lightened or darkened skin colour where skin is treated
  • nausea
  • pain or irritation at the site of application
  • redness of skin (mild)
  • scabbing, crusted skin
  • skin itching
  • swelling of skin (mild)
  • trouble sleeping
  • vomiting

Although most of the side effects listed below don’t happen very often, they could lead to serious problems if you do not check with your doctor or seek medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

  • any sign or symptom in the treatment area that makes daily activity difficult or impossible
  • any sign or symptom that makes it difficult to continue applying the medication
  • chest pain
  • cold sores
  • flare up of herpes infection
  • flu-like symptoms (e.g., fever or chills, headache, muscle aches, nausea)
  • painful joints
  • rash
  • symptoms of an infection (e.g., coughing, sore throat, muscle or joint pain, swollen glands, fatigue)

Stop taking the medication and seek immediate medical attention if any of the following occur:

  • severe diarrhea

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking this medication.

Are there any other precautions or warnings for Zyclara?

Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.

Exposure to sunlight: You should avoid or minimize any exposure to sunlight (including sunlamps) and use protective clothing (such as long sleeves and a hat) during treatment with imiquimod cream due to an increased risk of sunburn. If you get a sunburn, stop using the medication until you are fully recovered.

Immunosuppressed individuals: The safety and effectiveness of imiquimod cream has not been determined for people with medical conditions affecting the immune system (e.g., HIV/AIDS, lupus, psoriasis) or people taking medications that reduce the effectiveness of the immune system. If you have any condition affecting the immune system, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.

New actinic keratosis (AK) lesions: During treatment with imiquimod cream, new AK lesions may develop, but may clear with treatment. Even though initial AK lesions disappear with treatment, new lesions may develop in the future and will require further treatment. Keep in mind that AK is considered to be a chronic skin condition, and imiquimod cream is not a cure.

Skin colour changes: Some people using imiquimod cream notice that the area where the cream was applied has become lighter or darker. Sometimes, the change in skin colour is permanent.

Skin reactions: If you experience a severe skin reaction to this cream, wash the area with mild soap and water. Once the reaction has cleared, start using the cream again, unless your doctor has told you to stop using it.

Pregnancy: This medication should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking this medication, contact your doctor immediately.

Breast-feeding: It is not known if imiquimod passes into breast milk. If you are a breast-feeding mother and are taking this medication, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.

Children: The safety and effectiveness of using this medication have not been established for children under 18 years of age.

What other drugs could interact with Zyclara?

There may be an interaction between imiquimod and any of the following:

  • corticosteroids (e.g., prednisone)
  • echinacea
  • leflunomide
  • live vaccines (e.g., BCG, yellow fever)
  • medications that suppress the immune system (such as medications for cancer or organ transplants, e.g., tacrolimus, cyclosporine, methotrexate)
  • natalizumab
  • pimecrolimus
  • other medications applied to the skin

If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:

  • stop taking one of the medications,
  • change one of the medications to another,
  • change how you are taking one or both of the medications, or
  • leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Medications other than those listed above may interact with this medication. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.

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