Infection Risk While on Steroids for an Immune Reaction — What to Watch For and When to Call

Yes, to a degree — corticosteroid medicine used to calm an overactive immune reaction from immunotherapy also dampens your normal ability to fight infection, and the effect is bigger at higher doses and over longer courses. This is an expected, well-recognised trade-off of steroid treatment, not a sign anything has gone wrong with your immunotherapy.

How much your infection risk rises depends mainly on the steroid dose, how long you're on it, and whether you're also taking any other immune-suppressing medicine for the reaction. NCCN and ASCO irAE-management guidance treats this as a known, manageable side effect to watch for through the course — one that eases back on its own as your dose is gradually reduced under your oncology team's guidance.

This page explains how infection risk is managed during a steroid course for an immune reaction — it does not replace your treating oncologist's specific instructions for your own case.

Because steroids can dampen your body's normal infection warning signs, take any of the following seriously even if they seem mild at first — don't wait for your next scheduled visit:

No — this is the exact double bind irAE treatment is built to manage: an overactive immune reaction calmed with a short, targeted, tapered steroid course rather than an open-ended one. It can feel contradictory — treating immune overactivity with immune suppression — but this is the standard, guideline-backed approach worldwide, not a compromise unique to your case.

Current NCCN and ASCO guidance is that steroids given specifically to treat a confirmed immune-related adverse event, for the period needed to control it, have not been shown to meaningfully reduce immunotherapy's anti-cancer effect. The infection-risk trade-off described on this page is real and worth managing carefully with the precautions above — but it is a separate question from whether immunotherapy itself keeps working, and it's exactly why your care team tapers the dose as soon as it's safe to do so rather than keeping it high longer than needed.

For most patients, infection risk falls back close to baseline within days to a couple of weeks after the steroid dose is fully tapered off, tracking the taper itself rather than a fixed calendar date. A small number of patients on longer or higher-dose courses may take a little longer for their normal defences to recover fully, which is one reason your care team keeps monitoring through and shortly after the taper.

If a family member is helping you at home, the most useful role is keeping a simple symptom check going — a daily temperature if you feel unwell, watching for the red-flag signs above, and helping you get to your oncology team or the ER promptly if something comes up — rather than trying to judge whether the steroid dose itself should change. That decision always stays with your treating doctors. It also helps for household members to keep their own routine vaccinations up to date, since that adds a layer of protection around you without requiring any change to your own treatment.

Steroids don't only affect infection risk — see Mood Changes, Irritability and Anxiety on Steroids for what else is common during a course and what needs review. If your reaction settles and immunotherapy might restart afterwards, see Rechallenge: Going Back on Immunotherapy After a Reaction. And if steroids alone haven't been enough to bring the reaction under control, our guide on Second-Line Treatments When Steroids Are Not Enough explains what comes next. For the wider picture of how immunotherapy is delivered and monitored at CION, see the Immunotherapy at CION Cancer Clinics overview.