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N

native dry extract
an extract, typically hydroalcoholic, of plant material from which the solvent has evaporated to leave a solid residue

natriuretic
agent causing sodium to be excreted into the urine

nausea
symptoms resulting from an inclination to vomit

ne-
in botany, not, free from

necrosis
death of one or more cells, or of a portion of a tissue or organ

neonate
newborn

nephritis
kidney inflammation

nephro-
in botany, kidney-shaped

nephrolithiasis
presence of kidney stones or gravel

nephrosclerosis
hardening of the kidney from overgrowth and contraction of the interstitial connective tissue

nervous bladder
tendency to urinate in response to emotion stress

neuralgia/neuralgic ailment
pain of severe throbbing or stabbing nature along a nerve

neurasthenia
ill-defined condition, accompanying or following depression, characterized by vague fatigue believed to be brought about by psychological factors

neuritis
nerve inflammation

neuroleptic
a therapeutic agent which produces a state of altered awareness and tranquilization

neurotoxic
poisonous to the nerves

neurovegetative (neurovisceral)
referring to the innervation of the internal organs by the autonomic nervous system

nicotine-like effects
producing an effect which stimulates (small doses) and then depresses (large doses) autonomic nervous function

noradrenaline, norepinephrine
a catecholamine hormone secreted from the adrenal medulla and post-ganglionic adrenergic fibers in response to hypotension or emotional stress

NYHA guidelines
New York Heart Association guidelines specifying degrees of heart failure:

stage I -no effect on physical performance

stage II - performance of patient under major stress is decreased

stage III - performance affected even during normal activity but not during rest

stage IV - symptoms during rest, no physical stress is possible, patient must remain in bed