Anusol HC Drug Interactions: What to Avoid and What to Tell Your Doctor

Because Anusol HC (hydrocortisone acetate) is applied locally to the rectum and absorption into the bloodstream is relatively low (about 26% with rectal suppositories), drug interactions are fewer than with oral corticosteroids. However, they're not zero — and some interactions are serious. Here's what you need to know before starting this medication.

Does Anusol HC Have Drug Interactions?

Yes, though they are less numerous and generally less severe than those associated with oral or injectable corticosteroids. The interactions that do exist are primarily related to the corticosteroid component (hydrocortisone) and are most relevant when:

• You are also taking other corticosteroids (systemic or topical)
• You are receiving live vaccines
• You are using medication that affects hydrocortisone metabolism
• You have conditions affected by corticosteroids, like diabetes, and the systemic absorption of rectal hydrocortisone has clinical significance

Major Interactions: Discuss Immediately With Your Doctor

• Live vaccines (e.g., MMR, varicella, intranasal flu vaccine, yellow fever): Corticosteroids can suppress the immune response needed for vaccines to work. Administration of live or live-attenuated vaccines is contraindicated in patients receiving immunosuppressive doses of corticosteroids. Even the relatively modest systemic absorption of rectal hydrocortisone can be a concern — check with your doctor before receiving any live vaccine while on Anusol HC.
• Amphotericin B (an antifungal): Concurrent use of amphotericin B (a systemic antifungal) with hydrocortisone has been associated with cardiac enlargement and congestive heart failure. These medications are generally not used together.

Moderate Interactions: Monitor Carefully

• Other corticosteroids (prednisone, dexamethasone, budesonide, other topical steroids): Using multiple corticosteroid products together increases the risk of HPA axis suppression. If you're already on oral prednisone or a high-potency topical steroid, your doctor needs to know before starting Anusol HC.
• CYP3A4 inhibitors (ketoconazole, itraconazole, ritonavir, clarithromycin, grapefruit): These drugs slow the breakdown of hydrocortisone in the liver, potentially increasing its blood levels and risk of systemic effects even from rectal application. Inform your doctor if you take any antifungals or HIV medications.
• CYP3A4 inducers (rifampin, phenytoin, carbamazepine, St. John's Wort): These drugs speed up hydrocortisone metabolism, potentially reducing its effectiveness. If you're on anti-seizure medications or rifampin, your doctor may need to adjust your dosing.
• Diabetes medications (insulin, metformin, other anti-diabetics): Corticosteroids can raise blood sugar levels. Even with rectal application, patients with diabetes should monitor blood glucose more carefully while using Anusol HC. You may need a temporary adjustment in your diabetes medications.
• Warfarin (Coumadin) and other anticoagulants: Corticosteroids may alter the body's response to anticoagulants. Your INR (blood clotting measure) may be affected. Monitor closely if you take blood thinners.

Minor Interactions and Precautions

• NSAIDs (ibuprofen, naproxen, aspirin): Long-term concurrent use of NSAIDs with corticosteroids can increase the risk of GI ulcers and bleeding. This is more relevant with oral corticosteroids but worth mentioning to your doctor.
• Diuretics (furosemide, hydrochlorothiazide): Both corticosteroids and some diuretics can cause potassium loss. Using them together may increase the risk of low potassium (hypokalemia), especially with extended use.
• Antifungal skin or rectal creams (e.g., clotrimazole, miconazole): These are not directly contraindicated with Anusol HC, but corticosteroids can mask or worsen fungal infections. Anusol HC should NOT be used if a fungal infection of the rectal area is present.

Conditions That Increase Interaction Risk

Certain underlying health conditions can make drug interactions more significant with Anusol HC:

• Diabetes — blood sugar monitoring more important
• Tuberculosis (latent or active) — corticosteroids can reactivate latent TB
• Immunocompromised status — infections can spread more readily
• Osteoporosis — any additional corticosteroid exposure (even rectal) may matter

What to Tell Your Doctor Before Starting Anusol HC

Before starting Anusol HC, let your doctor know about:

• All prescription medications, including corticosteroids and anticoagulants
• OTC medications and supplements, especially NSAIDs, St. John's Wort, and grapefruit juice
• Any upcoming vaccinations — especially live vaccines
• History of diabetes, TB, fungal infections, or immune system problems
• Pregnancy or breastfeeding status

For more information on Anusol HC side effects to watch for, see: Anusol HC Side Effects: What to Expect and When to Call Your Doctor. For a full medication overview, see: What Is Anusol HC? Uses, Dosage, and What You Need to Know in 2026.