MitoTam bromide, hydrobromide, a Tamoxifen derivative, is an electron transport chain (ETC) inhibitor. MitoTam bromide, hydrobromide reduces mitochondrial membrane potential in senescent cells and affects mitochondrial morphology. MitoTam bromide, hydrobromide is an effective anticancer agent, suppresses respiratory complexes (CI-respiration) and disrupts respiratory supercomplexes (SCs) formation in breast cancer cells.