Adenovirus Vaccine Drug Interactions: What to Avoid and What to Tell Your Doctor

As a live oral vaccine, the Adenovirus Type 4 and Type 7 Vaccine, Live, Oral has a distinct set of drug interactions that differ from those associated with most prescription medications. The primary concern is medications that suppress the immune system—these can either reduce the vaccine's effectiveness (by blunting the immune response) or increase the risk of serious infection (by allowing the live vaccine virus to cause disease rather than just immunity).

While most military recruits entering basic training are young and healthy adults unlikely to be on immunosuppressive medications, it is important for both recruits and military medical personnel to understand these interactions—particularly for recruits with underlying inflammatory conditions, autoimmune diseases, or recent cancer treatment.

Why Immunosuppressants Are the Biggest Concern

The Adenovirus Vaccine works by establishing a live intestinal infection with adenovirus that triggers an immune response. Immunosuppressant medications work by reducing immune system activity—which is exactly what is needed to treat autoimmune diseases and prevent transplant rejection. But when the immune system is suppressed, two problems arise with live vaccines:

Reduced vaccine efficacy: The suppressed immune system may not generate adequate neutralizing antibodies, leaving the recipient unprotected.

Increased risk of vaccine-strain infection: A severely immunocompromised person given a live vaccine may be unable to control the replication of the vaccine virus, potentially leading to disseminated infection from the vaccine strain itself.

Contraindicated Medications (Do Not Administer With These)

The following medications are contraindicated with the Adenovirus Vaccine. Anyone currently taking these medications should NOT receive the vaccine without specialist consultation:

Certolizumab pegol (Cimzia): TNF inhibitor biologic. Do not give live vaccines concurrently.

Ibrutinib (Imbruvica): BTK inhibitor used in hematologic malignancies. Contraindicated with live vaccines.

Cyclosporine: Used in transplant rejection and autoimmune disease. Contraindicated; avoid live vaccines for at least 3 months after cessation.

Secukinumab (Cosentyx): IL-17 inhibitor. May interfere with immune response to live vaccines.

Ustekinumab (Stelara): IL-12/23 inhibitor. Complete age-appropriate immunizations before initiating therapy.

Ixekizumab (Taltz): IL-17 inhibitor. May interfere with immune response and increase risk for adverse effects.

Mechlorethamine (nitrogen mustard), lomustine, carmustine, and other alkylating agents: Chemotherapy agents. Live vaccines should be avoided for at least 3 months after cessation of immunosuppressive chemotherapy.

High-dose corticosteroids: Avoid live vaccines for at least 1 month when initiating or after high-dose systemic corticosteroid therapy administered for ≥2 weeks.

Medications to Avoid or Use With Caution

The following medications are not absolutely contraindicated but should be used with caution and discussed with a medical provider before vaccination:

Abatacept (Orencia): CTLA-4 immunoglobulin. Live-attenuated vaccines should be avoided for at least 3 months after cessation of therapy.

Abrocitinib (Cibinqo): JAK1 inhibitor. Live vaccine administration is not recommended during treatment or immediately before or after.

Cyclophosphamide, chlorambucil, idarubicin: Chemotherapy agents. Live vaccines should be avoided for at least 3 months post-therapy.

Fingolimod (Gilenya): MS medication. May diminish therapeutic effects of vaccines.

Immune Globulins and Blood Products

Immune globulin preparations can interfere with the immune response to live virus vaccines by providing pre-formed antibodies that can neutralize the vaccine virus before the immune system has a chance to respond. For the Adenovirus Vaccine, specific guidance includes:

Vaccinia immune globulin (intravenous): Defer live vaccines for 3 months after immune globulin administration

Rho(D) immune globulin: May decrease effects of the adenovirus vaccine

Medications That Are Generally Safe to Co-Administer

In clinical trials, the Adenovirus Vaccine was routinely co-administered with other standard military entry vaccines, including:

Hepatitis A vaccine (inactivated)

Hepatitis B vaccine (recombinant)

HPV vaccine (quadrivalent)

Influenza vaccine (inactivated)

MMR (measles, mumps, rubella) vaccine

Meningococcal vaccines

Poliovirus vaccine (inactivated)

However, there are no formal data confirming that the Adenovirus Vaccine does not interfere with the immune response to these co-administered vaccines. Co-administration is based on standard practice rather than immunogenicity data for each combination.

What to Tell Your Military Medical Provider Before Vaccination

Before receiving the Adenovirus Vaccine, recruits should disclose to the military medical provider:

All current medications, including prescription drugs, over-the-counter medications, vitamins, and supplements

Any biologic medications or immunosuppressants taken in the past 6 months

Any recent chemotherapy or radiation therapy

Recent immune globulin or blood product administration

Any diagnosed immune system disorder (primary or secondary immunodeficiency)

For information on what side effects to expect from the vaccine itself, see: Adenovirus Vaccine Side Effects: What to Expect and When to Call Your Doctor.

To understand why immunosuppressants interfere with vaccine efficacy, see: How Does the Adenovirus Vaccine Work? Mechanism of Action Explained.