Phenformin

Compound CodeKAT-MCI-02
Pharmacological TagAntidiabetic (withdrawn) / Mitochondrial disruptor
Structural ClassBiguanide
Mechanism (Putative) Mitochondrial Complex I inhibition → ↓ ATP AMP accumulation → AMPK activation Suppression of hepatic gluconeogenesis ROS production in metabolically stressed cells
Functional Role Insulin sensitization Glucose control (historic) Potential anti-neoplastic vector Metabolic deranger in tumor models
Structural Analogues Metformin Buformin Cycloguanil Proguanil
Predicted OnsetModerate (oral bioavailability ~50%)
Predicted Duration12–24 hours (extended hepatic retention)
Affinity Profile Non-receptor based Targets cellular metabolism and redox states Minimal direct enzyme inhibition
Computational Predictions CNS Activity: negligible BBB Penetration: low Mitochondrial Accumulation: high Lactic Acidosis Risk: elevated in hypoxic states Tumor Selectivity (hypoxia): plausible Mutagenicity: low Metabolism: CYP2D6 / hepatic deamination
Interpretation A post-mortem drug — pharmaceutically discontinued but pharmacologically resurrected Exploited toxicity repurposed as a precision weapon in cellular energetics Promising in oncological bioenergetics, yet clinically outlawed Operates in a grey zone: metabolic sabotage as medicine.
It enters cells more readily than metformin and is reported to be 10 times more potent, the binding affinity affinity for mitochondria membranes was reported as x 50 higher. Phenformin may increase DNA repair and switches metabolic energy to glycosis.