Sominex is for those occasions when you cannot get to sleep because your natural routine is disturbed. Clinically proven to relieve occasional sleeplessness. For temporary shortterm relief only. If symptoms persist, consult your doctor.take one tablet at bedtime. It may be taken up to one hour after going to bed when sleep is difficult to achieve. Not to be taken by children under 16 years. Each tablet contains Promethazine Hydrochloride Ph. Eur.20mg.