Category: N

An antibiotic administered by mouth or injection to treat certain infections resistant to other antibiotics. Side-effects, including digestive upsets and rashes, occur frequently and for this reason other antibiotics are usually preferred.  

A genus of fleas. The common rat flea of temperate regions, N. fasciatus, will, in the absence of rats, bite man and may therefore transmit plague or murine typhus from an infected rat population. The rat flea is also an intermediate host for the larval stage of two tapeworms, Hymenolepis diminuta and H. nana. A…

A synthetic female sex hormone administered by mouth to treat menstrual disorders, including amenorrhea. It is also used in oral contraceptives, often in combination with an estrogen. A synthetic preparation that has the action of progesterone, but is active when given by mouth. Norethisterone, primarily utilized as a progestogen medication, is a component in certain…

A synthetic male sex hormone with body-building action. It has the same effects and uses as methandienone and is administered by mouth or injection.  

A person in whose body fluids it is not possible to detect soluble forms of the A, B, or O agglutinogens that determine blood group. An individual whose saliva and other body fluids do not contain the ABO blood antigens.  

A woman who has been pregnant at least nine times and has given birth to an infant capable of survival after each of nine pregnancies.  

A strong corrosive mineral acid, HNO3, the concentrated form of which is capable of producing severe bums of the skin. Swallowing the acid leads to intense burning pain and ulceration of the mouth and throat. Treatment is by immediate administration of alkaline solutions, followed by milk or olive oil. A colorless, corrosive, poisonous liquid in…

Collections of dark-staining material, containing RNA, seen in the cell bodies of neurons on microscopic examination.  

An anthelmintic drug used particularly in the treatment of schistosomiasis. It is administered by mouth and side-effects may include agitation and confusion, abdominal discomfort, digestive upsets, and headache. Niridazole should not be used in patients with impaired liver function.  

A drug active against various microorganisms, used mainly to treat fungus infections of the genital and urinary systems (such as candidiasis of the vagina). It is administered by mouth and in pessaries; side-effects are rare, but some digestive discomfort may occur.