An<unk>  drug, also called simply an<unk> , pain reliever, or painkiller, is any member of the group of drugs used to achieve relief from pain (that is,<unk>  or pain management).<unk> s are conceptually distinct from anesthetics, which temporarily reduce, and in some instances eliminate, sensation, although<unk>  and anesthesia are neurophysiologically overlapping and thus various drugs have both<unk>  and anesthetic effects.<unk>  choice is also determined by the type of pain: For neuropathic pain, traditional<unk> s are less effective, and there is often benefit from classes of drugs that are not normally considered<unk> s, such as tricyclic antidepressants and anticonvulsants. Various<unk> s, such as many NSAIDs, are available over the counter in most countries, whereas various others are prescription drugs owing to the substantial risks and high chances of overdose, misuse, and addiction in the absence of medical supervision.
Analgesic
Equianalgesic
Antiseptic
Steroid
Immunostimulant
Neuroleptanalgesic
Antipyretic
Local anesthetic