The product can be used by adults to “facilitate sleep onset” and improve “quality of sleep”, the manufacturer said.

“Prior to this launch, licensed liquid melatonin was unavailable. Instead, clinicians have prescribed a variety of unlicensed products,” Colonis said.

The strawberry-flavoured oral solution is lactose and sugar-free. It provides “maximal dose flexibility” and can be used by patients across a “wide age range”, Colonis said.

The NHS price for 150ml of melatonin 1mg/ml oral solution is £130.00.

Melatonin 1mg/ml oral solution is available from mainline wholesalers including AAH, Alliance Healthcare and Phoenix Healthcare. For more information, contact Colonis on 01892 739 403 or [email protected]