content: property: white crystalline powder，odorless，bitter taste, soluble in water and ethanol, ramification of sildenafil citrate mechanism: hongdenafil is based on sildenafil citrate with 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