Moxisylyte, also known as thymoxamine, is a drug used in urology for the treatment of erectile dysfunction. It is an ñ<sub>1</sub>-adrenergic antagonist. In the United Kingdom, Moxisylyte is marketed as Opilon (Archimedes Pharma UK Ltd) and is used for the short-term treatment of primary Raynaud's syndrome. This is a condition where the fingers and toes become discoloured and is triggered by responses to cold, or emotional distress. Opilon tablets help by improving blood circulation to the extremities.