Tetridinum (Tetridinum, a synonym of Vedernorm, list B ) is a hypnotic. Sleep caused by tetridine is less deep than when barbiturates are used. The effect occurs in 20-30 minutes. and lasts 5-7 hours. Accepted inside 0.2-0.4 g. Higher doses: one-time - 0.5 g, daily - 1.5 g. Tetridine release forms: powder and tablets of 0.1 and 0.2 g. Store in protected from light location. See also Sleeping Pills .