A formulation or preparation for treating and preventing arterial and venous thrombi is provided. This preparation includes a non-metal containing photodynamic dye and a fat soluble vitamin. A method of administration for treatment and prophylaxis of arterial and venous thrombi is also provided. This method includes steps of: combining a non-metal containing photodynamic dye and a fat soluble vitamin; combining the non-metal containing photodynamic dye and fat soluble vitamin with a sodium solution; and administering the combination of non-metal containing photodynamic dye, fat soluble vitamin, and sodium solution as an intravenous drip.