Antipsychotic Lurasidone Protected Memory in Rats Given Chemo

TL;DR: In rats given the chemotherapy drug doxorubicin, which caused memory problems, adding the antipsychotic lurasidone protected memory on maze and object tests. This was a prevention study in male rats, not a treatment for people with “chemo brain.”

Source: Frontiers in Pharmacology (2026) | Habib et al.

Many people treated for cancer describe “chemo brain”: trouble remembering, concentrating and finding words during and after chemotherapy. Doxorubicin, widely used for breast cancer and other tumors, is one of the drugs linked to it. There is no approved treatment.

Researchers at Ain Shams University in Cairo tested whether lurasidone, an antipsychotic used for schizophrenia and bipolar depression, could protect memory in rats given doxorubicin.

Four Groups of Rats Over Four Weeks

The team split 48 adult male rats into four groups of 12:

• Control: Dummy treatments only.
• Lurasidone only: 3 mg/kg by mouth daily.
• Chemo only: Doxorubicin injected once a week.
• Chemo plus lurasidone: Both, starting at the same time.

In the last week, rats took several memory and behavior tests. Observers did not know which group each rat was in.

Chemo Impaired Memory; Lurasidone Protected It

In a water maze, rats learn to find a hidden platform. In the final test the platform is removed, and the time spent searching where it used to be shows how well they remember.

• Water maze memory: Chemo-only rats spent much less time in the right area. Rats also getting lurasidone spent significantly more time there.
• Object memory: Chemo-only rats lost their usual interest in a new object. Lurasidone restored it, though the overall statistical test for a drug interaction was not significant.
• Exploring an open space: Chemo-only rats avoided the center, a sign of anxiety, and lurasidone partly reversed this.

Lurasidone did not speed up how quickly chemo-treated rats learned the maze in the first place. Chemo-only rats also lost weight, and lurasidone reduced that loss by the fourth week.

Brain Chemistry Moved Back Toward Normal

In the hippocampus and prefrontal cortex, both key memory areas, chemo lowered levels of BDNF, a protein that supports nerve cells, and Glt-1, which clears the brain chemical glutamate. Glutamate rose and the calming chemical GABA fell. In rats also given lurasidone, these measures moved back toward normal, and there was less nerve cell loss and support-cell activation.

The authors propose that lurasidone works by restoring this glutamate balance, but the study did not block the pathway to prove it.

Why This Is Far From the Clinic

• Rats, not people: Results in animals often don’t carry over.
• Males only: Doxorubicin is widely used in breast cancer, mostly in women.
• Prevention, not treatment: Lurasidone was given from the start, not after memory problems appeared.
• One dose: No test of higher or lower doses.
• No cancer: Healthy rats got chemo, so effects on cancer treatment weren’t tested.
• Antipsychotic side effects: Not studied here.

Would It Help Cancer Patients?

Lurasidone is already an approved drug, which could make human testing easier. But before that, it would need to be tested in female animals, in animals with tumors, and after memory problems have already set in. Nobody should take it for chemo brain based on this study.