Property: white crystalline powder,odorless,bitter taste, soluble in water and ethanol, ramification of Sildenafil Citrate Mechanism:hongdenafil is based on Sildenafil citratewith same mechanism of Sildenafil. Dosage: less than Sildenafil citrate once regarding as untested Sildenafil , and was test out last year by Japanese. Storage: sealed in room temperature Valid Date: 2-3 years Specification: 1kg/20kg/50kg are available