Over-the-Counter Medications May Alter Cancer Immunotherapy Outcomes

Immunotherapy is revolutionizing cancer treatment, offering new hope for patients with previously grim prognoses by harnessing the body’s own immune system to fight the disease. Often, this approach spares patients from the harsh side effects associated with traditional chemotherapy. However, the success of immunotherapy may be significantly influenced by everyday over-the-counter (OTC) medications people are taking concurrently with treatment.

This often-overlooked factor in cancer care is the focus of a recent commentary published in the Journal of Clinical Oncology by researchers at Duke Health. The commentary highlights the potential for drug interactions that impact the immune system, a critical component of immunotherapy’s effectiveness.

How OTC Meds Can Interfere with Immunotherapy

“We think about drug interactions all the time, but these are interactions with the immune system that we’re not considering,” says lead author Nicholas DeVito, assistant professor in the division of medical oncology at Duke University School of Medicine. “Adding or subtracting a medication from a patient’s list could imply the difference between cure or not.”

The Duke Health team reviewed over 50 studies and found that commonly used OTC medications – often taken to manage pain, inflammation, and treatment-related side effects – can alter how the body responds to immunotherapy. Specifically, the research suggests that widely used drugs like acetaminophen, proton pump inhibitors (PPIs), and corticosteroids may reduce the efficacy of immunotherapy treatment.

“Some of these drugs might not only make immunotherapy less effective, but they could also be causing side effects or increasing the rate of side effects,” DeVito explains.

OTC Meds That May Enhance Immunotherapy

Conversely, the research indicates that certain OTC medications may actually enhance the effectiveness of immunotherapy. These include antihistamines, statins, and selective serotonin reuptake inhibitors (SSRIs), a class of antidepressants.

The Need for Better Documentation and Research

The authors of the commentary emphasize the need for improved documentation of both prescription and OTC medications in clinical trials. This would allow for more accurate interpretation of results and a better understanding of how these drugs influence immunotherapy outcomes. They also advocate for prospective studies specifically designed to confirm these interactions.

Empowering Patients and Improving Clinical Practice

The Duke Health team proposes practical tools to help clinicians incorporate this knowledge into everyday care. These include patient education materials and prompts within electronic health records to remind providers to consider potential drug interactions.

“Patients need to be empowered to ask questions about the medications they capture, and providers must be more mindful, because even common drugs can change the effectiveness of cancer treatment,” DeVito states.

Key Takeaways

• Immunotherapy’s success can be affected by over-the-counter medications.
• Acetaminophen, PPIs, and corticosteroids may reduce immunotherapy effectiveness.
• Antihistamines, statins, and SSRIs may enhance immunotherapy effectiveness.
• Better documentation and further research are needed to fully understand these interactions.
• Open communication between patients and healthcare providers is crucial.

Source: American Cancer Society, MD Anderson Cancer Center