A<unk>  or tranquilliser is a substance that induces sedation by reducing irritability or excitement. They are CNS depressants and interact with brain activity causing its deceleration. Various kinds of<unk> s can be distinguished, but the majority of them affect the neurotransmitter gamma-aminobutyric acid (GABA). In spite of the fact that each<unk>  acts in its own way, most produce relaxing effects by increasing GABA activity. This group is related to hypnotics. The term<unk>  describes drugs that serve to calm or relieve anxiety, whereas the term hypnotic describes drugs whose main purpose is to initiate, sustain, or lengthen sleep. Because these two functions frequently overlap, and because drugs in this class generally produce dose-dependent effects (ranging from anxiolysis to loss of consciousness) they are often referred to collectively as<unk> -hypnotic drugs.<unk> s can be used to produce an overly-calming effect (alcohol being the most common sedating drug). In the event of an overdose or if combined with another<unk> , many of these drugs can cause deep unconsciousness and even death.
Sedative
Abirritant
Anxiogenic
Anxiotropic
Hypnotic
Psychotomimetic
Anticonvulsant
Inhalation sedation