Understanding Zelsuvmi Drug Interactions

If you or your child has been prescribed Zelsuvmi (berdazimer topical gel, 10.3%) for molluscum contagiosum, you probably want to know: is it safe to use with other medications?

The good news is that Zelsuvmi is a topical medication — meaning it's applied directly to the skin and works locally rather than being absorbed into your bloodstream like a pill. This significantly reduces the risk of drug interactions compared to systemic medications.

That said, there are still important things to know and discuss with your doctor. This guide covers everything you need to know about Zelsuvmi and potential interactions.

The Good News: No Major Drug Interactions Listed

According to the prescribing information, Zelsuvmi has no listed major drug interactions, no moderate drug interactions, and no food interactions.

This is a significant advantage of topical medications. Because Zelsuvmi works at the skin surface — releasing nitric oxide directly onto molluscum lesions — it doesn't enter the bloodstream in meaningful amounts. This means it's unlikely to interfere with:

• Oral medications (pills, capsules, liquids)
• Injected medications
• Inhaled medications
• Vitamins and supplements
• Food or beverages

What You Should Still Be Careful About

While Zelsuvmi doesn't have listed systemic drug interactions, there are practical considerations when using any topical medication:

1. Other Topical Products on the Same Skin Area

The most important thing to avoid is applying other topical products directly on top of or mixed with Zelsuvmi on the same skin areas. This includes:

• Other prescription topical medications — If you're using another cream or ointment for a different skin condition, don't apply it to the same spots where you apply Zelsuvmi.
• Over-the-counter skin treatments — Products like hydrocortisone cream, antifungal creams, or acne medications could interfere with how Zelsuvmi contacts the skin.
• Moisturizers and lotions — Applying thick moisturizers directly over Zelsuvmi could create a barrier that prevents the gel from working properly.
• Sunscreen — Wait for Zelsuvmi to fully dry (at least 10 minutes) before applying sunscreen to the same area, if needed.

The rule of thumb: Let Zelsuvmi dry completely (10 minutes) and absorb before applying anything else to the treated area. Better yet, apply other products to different areas of the skin when possible.

2. Products That Could Irritate the Skin

Since Zelsuvmi can already cause skin reactions like stinging (19%), redness (12%), and itching (6%), using irritating products on the same area could make side effects worse:

• Retinoids (tretinoin, adapalene) — These can dry and irritate skin
• Benzoyl peroxide — Can cause drying and peeling
• Salicylic acid products — Another potential irritant
• Alcohol-based products — Can sting and dry out treated skin
• Exfoliating scrubs or peels — Physical and chemical exfoliants can increase irritation

If you use any of these for acne or other skin conditions, apply them to different areas than where you're using Zelsuvmi. If there's overlap, talk to your doctor or dermatologist about timing or alternatives.

3. Immunosuppressive Medications

While there are no listed interactions between Zelsuvmi and immunosuppressive drugs, it's worth mentioning to your doctor if you take medications that suppress your immune system, such as:

• Oral corticosteroids (like prednisone)
• Biologics (like adalimumab, infliximab)
• Chemotherapy drugs
• Organ transplant medications

Your immune system plays a role in fighting the molluscum virus. If your immune system is suppressed, your doctor may want to monitor your response to Zelsuvmi more closely or adjust your treatment plan.

What to Tell Your Doctor Before Starting Zelsuvmi

Before your doctor prescribes Zelsuvmi, make sure to share:

• All medications you're currently taking — prescription and over-the-counter, including topical products
• Any allergies — especially to berdazimer or any component of the formulation. Zelsuvmi is contraindicated in patients with hypersensitivity to berdazimer.
• Other skin conditions — If you have eczema, psoriasis, or other skin conditions being treated with topicals, your doctor needs to know to avoid overlapping treatment areas.
• Pregnancy or breastfeeding — It's unknown whether Zelsuvmi can harm an unborn baby or pass into breast milk. Your doctor can help weigh the risks and benefits.
• Immune system conditions — HIV/AIDS, autoimmune conditions, or immunosuppressive therapy can affect how your body responds to treatment.

Zelsuvmi and Children's Medications

Since molluscum contagiosum most commonly affects children, parents often wonder if Zelsuvmi is safe alongside common pediatric medications. Based on available information:

• Children's fever reducers (acetaminophen, ibuprofen) — No interaction. Safe to use if your child develops mild fever, which occurs in about 2% of patients.
• Antibiotics — No listed interaction with oral or topical antibiotics.
• Antihistamines (like cetirizine or diphenhydramine) — No interaction. Can be helpful if your child experiences itching from Zelsuvmi.
• Asthma medications (inhalers, montelukast) — No interaction.
• Topical eczema creams (like hydrocortisone or tacrolimus) — No systemic interaction, but avoid applying to the same skin area as Zelsuvmi.

Can I Use Zelsuvmi with Ycanth or Other Molluscum Treatments?

If you're considering combining Zelsuvmi with other molluscum treatments, talk to your doctor first:

• Ycanth (cantharidin): This is an in-office treatment applied by a doctor. Using Zelsuvmi and Ycanth on the same lesions simultaneously is not recommended — the combination could increase skin irritation. Your doctor might use Ycanth on some lesions and Zelsuvmi on others.
• Cryotherapy or curettage: These in-office procedures remove or destroy individual lesions. Using Zelsuvmi on a recently frozen or scraped area could increase irritation and slow healing.
• Imiquimod (Aldara/Zyclara): Using two topical treatments on the same area could significantly increase skin reactions. Discuss with your doctor before combining.

For more on treatment alternatives, see our guide on alternatives to Zelsuvmi.

Tips for Safe Use

• Keep a medication list. Write down everything you and your child take — prescriptions, OTC drugs, vitamins, and topical products. Bring it to every doctor visit.
• Use Zelsuvmi as directed. Mix from Tube A and Tube B on the dosing guide, apply once daily, and let it dry for 10 minutes. Full instructions are in our usage and dosage guide.
• Space out topical products. If you use other skin products, apply them at different times or to different areas.
• Watch for increased irritation. If adding Zelsuvmi to your routine causes more redness, burning, or other reactions than expected, tell your doctor. For more on what to expect, read our side effects guide.
• Don't start or stop other medications without telling your doctor. Even though Zelsuvmi has no major drug interactions, your doctor should always know your full medication picture.

The Bottom Line

Zelsuvmi has no major drug interactions — one of the benefits of being a topical medication that works locally on the skin. The main things to watch for are using other topical products on the same skin areas and being aware that skin-irritating products can increase side effects.

Always tell your doctor about all the medications and skin products you use, and don't hesitate to ask questions. When used as directed, Zelsuvmi is a straightforward treatment with a low risk of interactions.

Ready to get started? Learn how to find a doctor who can prescribe Zelsuvmi, or check pharmacy stock near you.