THE GUT–MEDICATION CONNECTION: WHAT IF ABSORPTION IS THE PROBLEM?

Why Your Cortisol Dose Isn't Working — Part 2: Is Your Body Actually Absorbing Your Hydrocortisone?

You take your hydrocortisone, wait for it to start working, and sometimes nothing happens. Or the relief comes much later than expected. Why?

For people living with adrenal insufficiency, knowing that medication was swallowed isn't quite the same as knowing how quickly—or how much of it—reached the bloodstream.

In Part 2 of our My Adrenal Life podcast series, What Happens to Your Steroid Medication After You Swallow It?, we explore the science of hydrocortisone absorption and why digestive health can influence how replacement medication behaves.

Research suggests that oral hydrocortisone is generally absorbed very efficiently, with one controlled study reporting approximately 96% bioavailability. But that average doesn't guarantee identical absorption or timing for every person.

We explain the journey of a hydrocortisone tablet through the digestive system, from breaking apart and dissolving to passing through the intestinal lining and entering circulation.

In this episode, we explore:

• Delayed absorption versus reduced absorption: Why medication arriving late isn't necessarily the same as medication being lost.

• Food and medication timing: How meals may change the timing and peak of hydrocortisone absorption, depending on the formulation.

• Gastroparesis: Why delayed stomach emptying raises important questions about medication delivery, even though direct hydrocortisone research remains limited.

• Crohn's disease and celiac disease: How intestinal inflammation, damaged intestinal lining, and disease location may affect absorption—and where the evidence is still incomplete.

• Vomiting and diarrhea: Why gastrointestinal illness creates special concerns for people who depend on oral glucocorticoid replacement.

• Bariatric surgery: What a small study found about hydrocortisone exposure after gastric bypass and sleeve gastrectomy, including some surprising results.

• Understanding cortisol curves: What researchers mean by Tmax (time to peak), Cmax (peak concentration), and AUC (overall medication exposure).

We also discuss an important distinction: feeling unwell does not automatically mean your medication isn't being absorbed.

Sometimes the problem may involve delayed absorption. Sometimes illness increases the body's cortisol requirements. Other possibilities include medication clearance, dehydration, or symptoms caused by another medical condition.

Understanding these differences can help patients describe their experiences more clearly and have more informed conversations with their endocrinologists.

We also address the serious safety implications of persistent vomiting or severe diarrhea. When oral glucocorticoids cannot be reliably retained or absorbed, established emergency protocols and prompt medical care become essential.

Throughout the conversation, we examine what published research supports, what remains uncertain, and why conditions such as gastroparesis, active celiac disease, and long-term changes following bariatric surgery deserve further study.

The central takeaway? Hydrocortisone is generally well absorbed, but how quickly it reaches the bloodstream—and how consistently that happens—can matter. Digestive symptoms alone cannot tell us exactly what is happening to a dose.

This discussion is relevant to people with primary, secondary, tertiary, and glucocorticoid-induced adrenal insufficiency who depend on oral replacement medication.

Coming in Part 3: Once hydrocortisone reaches the bloodstream, what happens next? We'll explore liver metabolism, medication clearance, interactions with other drugs, and why some people may process glucocorticoids faster or slower than others.

To learn more, explore the My Adrenal Life Books Authored by founder Rick Disler available on Amazon, visit www.myadrenallife.com, and join our supportive My Adrenal Life Facebook Group for education, discussion, and community.