Imiquimod cream works by activating local immune responses, but it often causes skin and systemic reactions.
I. Common Side Effects
1. Local Skin Reactions
(1) Almost every user experiences local reactions to varying degrees, including erythema, erosion, peeling, dryness, small blisters, cracking, bleeding, induration, papules, folliculitis, edema, crusting, pain, burning sensation, itching, etc.
(2) These reactions are usually mild to moderate and are considered a sign that the medication is working.
2. Systemic Reactions
(1) A small number of patients may experience flu-like symptoms such as fever, chills, muscle aches, fatigue, headache, nausea, diarrhea, and loss of appetite.
(2) Some people may develop swollen lymph nodes or lymphadenitis.
3. Pigment Changes
Hyperpigmentation or hypopigmentation may occur at the application site, and in rare cases these changes may be permanent.
II. Serious Side Effects and Warnings
1. Severe Skin Damage
Severe ulceration, erosion, widespread erythema, edema, or large areas of skin peeling may occur in less than 5% of patients, requiring immediate discontinuation of the drug and medical attention.
2. Difficulty Urinating
When the cream is applied near the urethral opening or vaginal opening in women, local pain and swelling may cause difficulty urinating. Care should be taken to avoid these areas.
3. Allergic Reactions
In very rare cases, eczema or worsening rash may occur. People allergic to any ingredient of this product should not use it.
4. Risks in Special Populations
(1) Immunocompromised individuals (e.g., after organ transplant, with autoimmune diseases) may experience poor response or worsening of symptoms.
(2) Patients with chronic GVHD or autoimmune diseases should use with caution.
III. Ways to Relieve Side Effects
1. Control Dosage and Frequency
(1) Strictly apply three times per week, without using excessive amounts.
(2) Do not apply daily consecutively, as this significantly worsens side effects.
2. Strictly Control Application Time
For genital warts, keep for 6-10 hours; for actinic keratosis, wash off with soap and water after about 8 hours. Do not extend the time.
3. Local Skin Care
(1) If severe redness, swelling, erosion, or ulceration occurs, wash off the cream immediately and temporarily stop use.
(2) Mild, non-irritating moisturizers can be used daily to relieve dryness and peeling, but avoid applying immediately after applying the medication.
4. Managing Flu-like Symptoms
(1) When fever or muscle aches occur, rest more and drink plenty of fluids.
(2) If symptoms are severe, it is recommended to pause the medication and consult a doctor.
5. Avoid Sun Exposure
During treatment and for some time after stopping, the skin is more sensitive to UV light. Cover treated areas when going outdoors and avoid direct sunlight.
6. Male Foreskin Care
Men with uncircumcised foreskin should retract the foreskin daily to clean the area, which may reduce the risk of edema and erosion.
7. Indications for Immediate Medical Attention
If local ulceration expands, pain is severe, fever persists, or difficulty urinating occurs, discontinue the drug and seek medical attention immediately.
IV. Storage Requirements
1. Temperature Control
(1) Store below 25°C, avoid freezing.
(2) Do not place in a freezer or in high‑temperature environments (e.g., inside a car in summer).
2. Protect from Light and Moisture
Keep in original packaging, sealed, in a dry and cool place, away from direct sunlight and humidity (e.g., bathroom).
3. Child Safety
Must be stored out of reach of children to prevent accidental ingestion or misuse.
4. Single‑Use Principle
Open each packet only before use. Discard any remaining cream after opening; do not save for later use.
5. Package Information
Each packet contains 250 mg of cream. The expiry date is 2 years. Do not use expired medicine.
6. Avoid Contact with Latex Products
The oily components of the cream can damage latex products such as condoms. No special isolation is needed during storage, but avoid contact during use.
