Archive · 5 Aug 2026
Sildenafil Shows Promise Against Cancer Spread; Human Trials Still Needed
Scientists are studying a medicine called sildenafil, which is the main ingredient in a pill called Viagra.
Viagra is usually used to help people with a health problem called erectile dysfunction.
A new study from the Weizmann Institute of Science in Israel looked at how cancer works.
Cancer can spread through the body when cells break off from a tumor and travel to other parts of the body.
This spreading is called metastasis, and it is the most common reason people die from cancer.
The scientists found that sildenafil might stop cancer cells from using cholesterol, which they need to spread.
Cholesterol is like a fuel that helps cancer cells travel.
But this discovery was only made in a laboratory, not in real patients.
Doctors say we need more tests on humans before we know if it really works, or which cancers it might help.
Most importantly, doctors tell people not to take Viagra by themselves to try to fight cancer, because it can have side effects and be unsafe.
Researchers at the Weizmann Institute of Science in Israel found that sildenafil, the active ingredient in Viagra, may interfere with how cancer cells use cholesterol.
Cholesterol plays a key role in helping cancer cells detach from the original tumor and spread to distant organs, a process known as metastasis.
Metastasis is the leading cause of death from cancer, so even a small delay in this process could have meaningful clinical implications.
The findings come only from laboratory and preclinical studies and have not yet been tested in humans.
Experts urge patients not to take sildenafil for cancer prevention or treatment outside a clinical setting, citing side effects and interactions with other drugs, particularly heart medications.
- Who
- Researchers at the Weizmann Institute of Science in Israel, with expert commentary from Dr Saphalta Baghmar, Senior Consultant, Medical Oncology, Amrita Hospital, Faridabad.
- What
- A study suggesting sildenafil (Viagra's active ingredient) may interfere with cancer cells' use of cholesterol and potentially slow the spread of cancer.
- When
- Not specified in the articles.
- Where
- The study was conducted at the Weizmann Institute of Science in Israel.
- Why
- Because metastasis is the leading cause of cancer-related death, so disrupting how cancer cells spread could have meaningful clinical implications.
Research Optimism
Clinical Caution
Sildenafil's potential against cancer
Research Optimism
Laboratory findings suggest sildenafil may disrupt cancer cells' cholesterol use and slow metastasis, a scientifically exciting lead for future treatments.
Clinical Caution
The results come only from preclinical studies and do not prove sildenafil can prevent or treat cancer in patients; well-designed clinical trials are required first.
Drug repurposing for oncology
Research Optimism
Repurposing existing drugs like sildenafil can speed up access to therapies because their safety profiles are already well understood.
Clinical Caution
Scientific enthusiasm must be guided by strong clinical evidence, and misinterpretation of early findings can lead to unsafe practices like self-medication.
- Drug studied
- Sildenafil, the active ingredient in Viagra
- Research institution
- Weizmann Institute of Science, Israel
- Proposed mechanism
- Interfering with how cancer cells use cholesterol
- Stage of research
- Laboratory and preclinical studies; not yet tested in humans
- Relevance
- Metastasis is the leading cause of cancer-related death
- Expert quoted
- Dr Saphalta Baghmar, Senior Consultant, Medical Oncology, Amrita Hospital, Faridabad
- Expert advice
- Patients should not take sildenafil for cancer prevention or treatment outside a clinical setting
- Potential benefit
- Drug repurposing could speed up access to therapies since safety profiles are often already understood