A result in a dish, not a treatment.
Posts are sharing that loperamide, the over-the-counter diarrhea medicine, “killed human glioblastoma brain cancer cells”. Short answer: it did — in cells grown in a lab dish, in a 2018 study. No study has tested it in people with glioblastoma. Taken above the label dose, loperamide causes life-threatening heart-rhythm problems, so it must not be used this way. The post we were sent also pictures two different medicines (lorazepam and valproic acid), not loperamide.
If you or someone you love has a brain tumour, the oncology team can point to clinical trials that are actually testing new treatments.
Loperamide and glioblastoma · evidence checked 2026-10-28
Grades are calculated from the studies listed, by fixed rules.
In a dish, yes: lab studies found loperamide drove glioblastoma cells into a self-digestion process that killed them. Many drugs kill cancer cells in a dish; very few go on to work in people, where a drug must reach the brain at a high enough level without harming anything else.
“A medication commonly found in pharmacies for treating diarrhea may have an unexpected effect on one of the deadliest forms of brain cancer. Glioblastoma…”
Healthy Harbor · Facebook ad, seen Oct 2026
We found no study in people with glioblastoma. Do not take loperamide above the label dose: at high doses it causes dangerous, sometimes fatal heart-rhythm problems. Anyone with a brain tumour should ask their oncology team about clinical trials.