A Pill May Help Protect Thinking After Brain Radiation
Original title: Memantine Prevents Radiation-Induced Cognitive Decline in Brain Metastases - A Randomized Placebo-Controlled Trial.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was tested in people. That is the most reliable kind of research we share.
This was tested in people in a real trial, but it is not yet settled care for everyone.
The short version
A drug called memantine: A medicine given with whole-brain radiation to help protect thinking and memory. See the glossary helped people keep their memory and thinking after brain radiation.
What was studied. 130 people with cancer that had spread to the brain were treated with radiation. 66 of them took memantine: A medicine given with whole-brain radiation to help protect thinking and memory. See the glossary, 20 mg a day, for 6 months. The other 64 took a placebo, a pill with no medicine in it. No one knew which pill they got.
What they found. After 6 months, the memantine: A medicine given with whole-brain radiation to help protect thinking and memory. See the glossary group did better on thinking tests than the placebo group. Memory, remembering things later, and finding words all held up better with memantine. People on memantine also rated their health better. Side effects were more common with memantine. Appetite loss happened in 25.7% of them, versus 12.5% on placebo. Stomach upset happened in 7.5%, versus 0% on placebo.
What this means, and what it doesn't
What it could mean: If you are having radiation to the brain, this drug may help protect your thinking and memory. It is a drug doctors already know and use. You could ask your care team whether it fits your plan.
What it doesn't mean: This does not mean the drug treats the tumor itself. It is not a cure, and it does not make you live longer. This was one trial in 130 people at one point in time. The benefit was clearer in some groups than others, and the study was too small to be sure about every group. Some people got side effects, like losing their appetite. More study is needed before this is settled for everyone.
Source: PubMed, September 25, 2026 · Read the original
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