Duphafral Extravite Solution for Injection Presentation Duphafral Extravite is a pale yellow to brown sterile solution for injection containing four members of the B‑complex vitamins together with Vitamin C. Each ml contains: Thiamine Hydrochloride (Vitamin B1) 35 mg Riboflavin Sodium Phosphate (Vitamin B2) 0.5 mg Pyridoxine Hydrochloride (Vitamin B6) 7.0 mg Nicotinamide 23 mg Ascorbic acid (Vitamin C) 70 mg Chlorocresol as preservative 1.0 mg Disodium edetate anhydrous 0.1 mg