Viagra was invented for the heart. It failed. Then it became one of the best selling drugs on earth by accident. Now a new Israeli study out of the Weizmann Institute says sildenafil, the active ingredient in Viagra, might stop cancer from spreading by blocking how cancer cells use cholesterol. Combined with statins, a drug that was also discovered by accident, researchers saw real results in mice, human cancer cells, and patient data from 5 million people. This is the story of drug repurposing, from thalidomide to aspirin to statins to Viagra, and why the next cancer breakthrough might already be sitting in your medicine cabinet. Sildenafil, PDE5 inhibitor, cholesterol metastasis, Weizmann Institute cancer research, Clalit Health Services, triple negative breast cancer, Ayelet Erez, drug repurposing history, statins cancer, Akira Endo, cancer research 2026, medical history, pharmaceutical history, science news, oncology research. #historytok #viagra #cancerresearch #medicalhistory #sciencenews