Sominex is a trademarked name for two over the counter

Over-the-counter drug

Over-the-counter drugs are medicines that may be sold directly to a consumer without a prescription from a healthcare professional, as compared to prescription drugs, which may be sold only to consumers possessing a valid prescription...

 sleep aids. In the United States diphenhydramine

Diphenhydramine

Diphenhydramine hydrochloride is a first-generation antihistamine possessing anticholinergic, antitussive, antiemetic, and sedative properties which is mainly used to treat allergies. Like most other first-generation antihistamines, the drug also has a powerful hypnotic effect, and for this reason...

 is marketed under this name by GlaxoSmithKline

GlaxoSmithKline

GlaxoSmithKline plc is a global pharmaceutical, biologics, vaccines and consumer healthcare company headquartered in London, United Kingdom...

. In the UK Actavis UK

Actavis

Actavis is an international generic pharmaceutical company based in Iceland that was founded in 1956 as Pharmaco. Listed on the Icelandic Stock Exchange until 2007, it was taken private by Novator Partners, an investment vehicle of the chairman Björgólfur Thor Björgólfsson.In the late 1990s,...

 markets Promethazine

Promethazine

Promethazine is a first-generation antihistamine of the phenothiazine family. The drug has anti-motion sickness, antiemetic, and anticholinergic effects, as well as a strong sedative effect and in some countries is prescribed for insomnia when benzodiazepines are contraindicated...

 hydrochloride under the Sominex brand.

Sominex is also the name of a song written by Alan Menken and Howard Ashman for the hit musical Little Shop of Horrors

Little Shop of Horrors (musical)

Little Shop of Horrors is a rock musical, by composer Alan Menken and writer Howard Ashman, about a hapless florist shop worker who raises a plant that feeds on human blood. The musical is based on the low-budget 1960 black comedy film The Little Shop of Horrors, directed by Roger Corman...

. The song was not used in the film of the same name because Seymour and Audrey survive the plant's mischievous antics.