Hypnotic - A drug which induces sleep, but does not produce analgesia.
Analgesic - A drug which reduces the patient's perception of pain. The response to hypnotic drugs is dose dependent and many hypnotics given in small doses will act as sedatives.
Long-continued use of depressant drugs produces tolerance to the psychic effects of sedative drugs. Caution is always needed because metabolic disturbances or drug interaction may lead to depression of respiration which may, in turn, permit respiratory obstruction and respiratory failure as well as circulatory depression. As well as the specific sedatives and hypnotics, all tranquillisers, some antihypertensive drugs, antidepressant and antihistamines may have sedation as a side effect.watch it here www.youtube.com/watch?v=iWis-ZPuL-Q
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